/*
 * libev event processing core, watcher management
 *
 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#undef EV_STANDALONE
#define EV_STANDALONE 1
#undef EV_USE_MONOTONIC
#define EV_USE_MONOTONIC 0
#undef EV_USE_REALTIME
#define EV_USE_REALTIME 0
#undef EV_USE_CLOCK_SYSCALL
#define EV_USE_CLOCK_SYSCALL 0

/* this big block deduces configuration from config.h */
#ifndef EV_STANDALONE
# ifdef EV_CONFIG_H
#  include EV_CONFIG_H
# else
#  include "config.h"
# endif

# if HAVE_CLOCK_SYSCALL
#  ifndef EV_USE_CLOCK_SYSCALL
#   define EV_USE_CLOCK_SYSCALL 1
#   ifndef EV_USE_REALTIME
#    define EV_USE_REALTIME  0
#   endif
#   ifndef EV_USE_MONOTONIC
#    define EV_USE_MONOTONIC 1
#   endif
#  endif
# elif !defined(EV_USE_CLOCK_SYSCALL)
#  define EV_USE_CLOCK_SYSCALL 0
# endif

# if HAVE_CLOCK_GETTIME
#  ifndef EV_USE_MONOTONIC
#   define EV_USE_MONOTONIC 1
#  endif
#  ifndef EV_USE_REALTIME
#   define EV_USE_REALTIME  0
#  endif
# else
#  ifndef EV_USE_MONOTONIC
#   define EV_USE_MONOTONIC 0
#  endif
#  ifndef EV_USE_REALTIME
#   define EV_USE_REALTIME  0
#  endif
# endif

# if HAVE_NANOSLEEP
#  ifndef EV_USE_NANOSLEEP
#    define EV_USE_NANOSLEEP EV_FEATURE_OS
#  endif
# else
#   undef EV_USE_NANOSLEEP
#   define EV_USE_NANOSLEEP 0
# endif

# if HAVE_SELECT && HAVE_SYS_SELECT_H
#  ifndef EV_USE_SELECT
#   define EV_USE_SELECT EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_SELECT
#  define EV_USE_SELECT 0
# endif

# if HAVE_POLL && HAVE_POLL_H
#  ifndef EV_USE_POLL
#   define EV_USE_POLL EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_POLL
#  define EV_USE_POLL 0
# endif

# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
#  ifndef EV_USE_EPOLL
#   define EV_USE_EPOLL EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_EPOLL
#  define EV_USE_EPOLL 0
# endif

# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
#  ifndef EV_USE_KQUEUE
#   define EV_USE_KQUEUE EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_KQUEUE
#  define EV_USE_KQUEUE 0
# endif

# if HAVE_PORT_H && HAVE_PORT_CREATE
#  ifndef EV_USE_PORT
#   define EV_USE_PORT EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_PORT
#  define EV_USE_PORT 0
# endif

# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
#  ifndef EV_USE_INOTIFY
#   define EV_USE_INOTIFY EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_INOTIFY
#  define EV_USE_INOTIFY 0
# endif

# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
#  ifndef EV_USE_SIGNALFD
#   define EV_USE_SIGNALFD EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_SIGNALFD
#  define EV_USE_SIGNALFD 0
# endif

# if HAVE_EVENTFD
#  ifndef EV_USE_EVENTFD
#   define EV_USE_EVENTFD EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_EVENTFD
#  define EV_USE_EVENTFD 0
# endif

#endif

#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <stddef.h>

#include <stdio.h>

#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <time.h>
#include <limits.h>
#include <syscall.h>
#include <signal.h>
#include <sys/eventfd.h>
#include "easy_log.h"

int64_t ev_loop_warn_threshold = 10 * 1000;
__thread int64_t ev_malloc_count = 0;
__thread int64_t ev_malloc_time = 0;
__thread int64_t ev_write_count = 0;
__thread int64_t ev_write_time = 0;
__thread int64_t ev_read_count = 0;
__thread int64_t ev_read_time = 0;
__thread int64_t ev_client_cb_count = 0;
__thread int64_t ev_client_cb_time = 0;
__thread int64_t ev_server_process_count = 0;
__thread int64_t ev_server_process_time = 0;
__thread int     ev_watch_pending = 0;
__thread void    *ev_watch_pending_addr = NULL;



#ifdef EV_H
# include EV_H
#else
# include "ev.h"
#endif

EV_CPP(extern "C" {
          )

#ifndef _WIN32
# include <sys/time.h>
# include <sys/wait.h>
# include <unistd.h>
#else
# include <io.h>
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# ifndef EV_SELECT_IS_WINSOCKET
#  define EV_SELECT_IS_WINSOCKET 1
# endif
# undef EV_AVOID_STDIO
#endif

    /* OS X, in its infinite idiocy, actually HARDCODES
     * a limit of 1024 into their select. Where people have brains,
     * OS X engineers apparently have a vacuum. Or maybe they were
     * ordered to have a vacuum, or they do anything for money.
     * This might help. Or not.
     */
#define _DARWIN_UNLIMITED_SELECT 1

    /* this block tries to deduce configuration from header-defined symbols and defaults */

    /* try to deduce the maximum number of signals on this platform */
#if defined (EV_NSIG)
    /* use what's provided */
#elif defined (NSIG)
# define EV_NSIG (NSIG)
#elif defined(_NSIG)
# define EV_NSIG (_NSIG)
#elif defined (SIGMAX)
# define EV_NSIG (SIGMAX+1)
#elif defined (SIG_MAX)
# define EV_NSIG (SIG_MAX+1)
#elif defined (_SIG_MAX)
# define EV_NSIG (_SIG_MAX+1)
#elif defined (MAXSIG)
# define EV_NSIG (MAXSIG+1)
#elif defined (MAX_SIG)
# define EV_NSIG (MAX_SIG+1)
#elif defined (SIGARRAYSIZE)
# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
#elif defined (_sys_nsig)
# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
#else
# error "unable to find value for NSIG, please report"
    /* to make it compile regardless, just remove the above line, */
    /* but consider reporting it, too! :) */
# define EV_NSIG 65
#endif

#ifndef EV_USE_CLOCK_SYSCALL
# if __linux && __GLIBC__ >= 2
#  define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
# else
#  define EV_USE_CLOCK_SYSCALL 0
# endif
#endif

#ifndef EV_USE_MONOTONIC
# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
#  define EV_USE_MONOTONIC EV_FEATURE_OS
# else
#  define EV_USE_MONOTONIC 0
# endif
#endif

#ifndef EV_USE_REALTIME
# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
#endif

#ifndef EV_USE_NANOSLEEP
# if _POSIX_C_SOURCE >= 199309L
#  define EV_USE_NANOSLEEP EV_FEATURE_OS
# else
#  define EV_USE_NANOSLEEP 0
# endif
#endif

#ifndef EV_USE_SELECT
# define EV_USE_SELECT EV_FEATURE_BACKENDS
#endif

#ifndef EV_USE_POLL
# ifdef _WIN32
#  define EV_USE_POLL 0
# else
#  define EV_USE_POLL EV_FEATURE_BACKENDS
# endif
#endif

#ifndef EV_USE_EPOLL
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
#  define EV_USE_EPOLL EV_FEATURE_BACKENDS
# else
#  define EV_USE_EPOLL 0
# endif
#endif

#ifndef EV_USE_KQUEUE
# define EV_USE_KQUEUE 0
#endif

#ifndef EV_USE_PORT
# define EV_USE_PORT 0
#endif

#ifndef EV_USE_INOTIFY
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
#  define EV_USE_INOTIFY EV_FEATURE_OS
# else
#  define EV_USE_INOTIFY 0
# endif
#endif

#ifndef EV_PID_HASHSIZE
# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif

#ifndef EV_INOTIFY_HASHSIZE
# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif

#ifndef EV_USE_EVENTFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
#  define EV_USE_EVENTFD EV_FEATURE_OS
# else
#  define EV_USE_EVENTFD 0
# endif
#endif
#if defined(__NR_eventfd2) && defined(__NR_eventfd)
#undef EV_USE_EVENTFD
#define EV_USE_EVENTFD 1
#endif

#ifndef EV_USE_SIGNALFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
#  define EV_USE_SIGNALFD EV_FEATURE_OS
# else
#  define EV_USE_SIGNALFD 0
# endif
#endif

#if 0 /* debugging */
# define EV_VERIFY 3
# define EV_USE_4HEAP 1
# define EV_HEAP_CACHE_AT 1
#endif

#ifndef EV_VERIFY
# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
#endif

#ifndef EV_USE_4HEAP
# define EV_USE_4HEAP EV_FEATURE_DATA
#endif

#ifndef EV_HEAP_CACHE_AT
# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
#endif

    /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
    /* which makes programs even slower. might work on other unices, too. */
#if EV_USE_CLOCK_SYSCALL
# include <syscall.h>
# ifdef SYS_clock_gettime
#  define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
#  undef EV_USE_MONOTONIC
#  define EV_USE_MONOTONIC 1
# else
#  undef EV_USE_CLOCK_SYSCALL
#  define EV_USE_CLOCK_SYSCALL 0
# endif
#endif

    /* this block fixes any misconfiguration where we know we run into trouble otherwise */

#ifdef _AIX
    /* AIX has a completely broken poll.h header */
# undef EV_USE_POLL
# define EV_USE_POLL 0
#endif

#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
#endif

#ifndef CLOCK_REALTIME
# undef EV_USE_REALTIME
# define EV_USE_REALTIME 0
#endif

#if !EV_STAT_ENABLE
# undef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
#endif

#if !EV_USE_NANOSLEEP
# ifndef _WIN32
#  include <sys/select.h>
# endif
#endif

#if EV_USE_INOTIFY
# include <sys/statfs.h>
# include <sys/inotify.h>
    /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
# ifndef IN_DONT_FOLLOW
#  undef EV_USE_INOTIFY
#  define EV_USE_INOTIFY 0
# endif
#endif

#if EV_SELECT_IS_WINSOCKET
# include <winsock.h>
#endif

#if EV_USE_EVENTFD
    /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef EFD_NONBLOCK
#  define EFD_NONBLOCK O_NONBLOCK
# endif
# ifndef EFD_CLOEXEC
#  ifdef O_CLOEXEC
#   define EFD_CLOEXEC O_CLOEXEC
#  else
#   define EFD_CLOEXEC 02000000
#  endif
# endif
#endif

#if EV_USE_SIGNALFD
    /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef SFD_NONBLOCK
#  define SFD_NONBLOCK O_NONBLOCK
# endif
# ifndef SFD_CLOEXEC
#  ifdef O_CLOEXEC
#   define SFD_CLOEXEC O_CLOEXEC
#  else
#   define SFD_CLOEXEC 02000000
#  endif
# endif
    EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);

    struct signalfd_siginfo {
        uint32_t                ssi_signo;
        char pad[128 - sizeof (uint32_t)];
    };
#endif

    /**/

#if EV_VERIFY >= 3
# define EV_FREQUENT_CHECK ev_verify (EV_A)
#else
# define EV_FREQUENT_CHECK do { } while (0)
#endif

    /*
     * This is used to avoid floating point rounding problems.
     * It is added to ev_rt_now when scheduling periodics
     * to ensure progress, time-wise, even when rounding
     * errors are against us.
     * This value is good at least till the year 4000.
     * Better solutions welcome.
     */
#define TIME_EPSILON  0.0001220703125 /* 1/8192 */

#define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */

#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)

#if __GNUC__ >= 4
# define expect(expr,value)         __builtin_expect ((expr),(value))
# define noinline                   __attribute__ ((noinline))
#else
# define expect(expr,value)         (expr)
# define noinline
# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
#  define inline
# endif
#endif

#define expect_false(expr) expect ((expr) != 0, 0)
#define expect_true(expr)  expect ((expr) != 0, 1)
#define inline_size        static inline

#if EV_FEATURE_CODE
# define inline_speed      static inline
#else
# define inline_speed      static noinline
#endif

#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)

#if EV_MINPRI == EV_MAXPRI
# define ABSPRI(w) (((W)w), 0)
#else
# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
#endif

#define EMPTY       /* required for microsofts broken pseudo-c compiler */
#define EMPTY2(a,b) /* used to suppress some warnings */

    typedef ev_watcher      *W;
    typedef ev_watcher_list *WL;
    typedef ev_watcher_time *WT;

#define ev_active(w) ((W)(w))->active
#define ev_at(w) ((WT)(w))->at
#if defined(__x86_64__)
  #define ev_mb() __asm__ __volatile ("mfence" ::: "memory")
#elif defined(__aarch64__)
  #define ev_mb() __asm__ __volatile ("dsb sy" ::: "memory")  //for ARM
#else
    #error arch unsupported
#endif

#if EV_USE_REALTIME
    /* sig_atomic_t is used to avoid per-thread variables or locking but still */
    /* giving it a reasonably high chance of working on typical architectures */
    static EV_ATOMIC_T      have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
#endif

#if EV_USE_MONOTONIC
    static EV_ATOMIC_T      have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
#endif

#ifndef EV_FD_TO_WIN32_HANDLE
# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
#endif
#ifndef EV_WIN32_HANDLE_TO_FD
# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
#endif
#ifndef EV_WIN32_CLOSE_FD
# define EV_WIN32_CLOSE_FD(fd) close (fd)
#endif

#ifdef _WIN32
# include "ev_win32.c"
#endif

    /*****************************************************************************/

static inline int64_t current_time();

#ifdef __linux
# include <sys/utsname.h>
#endif

    static unsigned int noinline
    ev_linux_version (void)
    {
#ifdef __linux
        unsigned int            v = 0;
        struct utsname          buf;
        int                     i;
        char                    *p = buf.release;

        if (uname (&buf))
            return 0;

        for (i = 3 + 1; --i; ) {
            unsigned int            c = 0;

            for (;;) {
                if (*p >= '0' && *p <= '9')
                    c = c * 10 + *p++ - '0';
                else {
                    p += *p == '.';
                    break;
                }
            }

            v = (v << 8) | c;
        }

        return v;
#else
        return 0;
#endif
    }

    /*****************************************************************************/

#if EV_AVOID_STDIO
    static void noinline
    ev_printerr (const char *msg)
    {
        write (STDERR_FILENO, msg, strlen (msg));
    }
#endif

    static void ( *syserr_cb)(const char *msg);

    void
    ev_set_syserr_cb (void (*cb)(const char *msg))
    {
        syserr_cb = cb;
    }

    static void noinline
    ev_syserr (const char *msg)
    {
        if (!msg)
            msg = "(libev) system error";

        if (syserr_cb)
            syserr_cb (msg);
        else {
#if EV_AVOID_STDIO
            ev_printerr (msg);
            ev_printerr (": ");
            ev_printerr (strerror (errno));
            ev_printerr ("\n");
#else
            perror (msg);
#endif
            abort ();
        }
    }

    static void *
    ev_realloc_emul (void *ptr, size_t size)
    {
        if (size)
            return realloc (ptr, size);

        free (ptr);
        return 0;
    }

    static void *( *alloc)(void *ptr, size_t size) = ev_realloc_emul;

    void
    ev_set_allocator (void *(*cb)(void *ptr, size_t size))
    {
        alloc = cb;
    }

    inline_speed void *
    ev_realloc (void *ptr, long size)
    {
        ptr = alloc (ptr, size);

        if (!ptr && size) {
#if EV_AVOID_STDIO
            ev_printerr ("(libev) memory allocation failed, aborting.\n");
#else
            fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
#endif
            abort ();
        }

        return ptr;
    }

#define ev_malloc(size) ev_realloc (0, (size))
#define ev_free(ptr)    ev_realloc ((ptr), 0)

    /*****************************************************************************/

    /* set in reify when reification needed */
#define EV_ANFD_REIFY 1

    /* file descriptor info structure */
    typedef struct {
        WL                      head;
        unsigned char           events; /* the events watched for */
        unsigned char           reify;  /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
        unsigned char           emask;  /* the epoll backend stores the actual kernel mask in here */
        unsigned char           cdel;
#if EV_USE_EPOLL
        unsigned int            egen;    /* generation counter to counter epoll bugs */
#endif
#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
        SOCKET                  handle;
#endif
#if EV_USE_IOCP
        OVERLAPPED              or , ow;
#endif
    } ANFD;

    /* stores the pending event set for a given watcher */
    typedef struct {
        W                       w;
        int                     events; /* the pending event set for the given watcher */
    } ANPENDING;

#if EV_USE_INOTIFY
    /* hash table entry per inotify-id */
    typedef struct {
        WL                      head;
    } ANFS;
#endif

    /* Heap Entry */
#if EV_HEAP_CACHE_AT
    /* a heap element */
    typedef struct {
        ev_tstamp               at;
        WT                      w;
    } ANHE;

#define ANHE_w(he)        (he).w     /* access watcher, read-write */
#define ANHE_at(he)       (he).at    /* access cached at, read-only */
#define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
#else
    /* a heap element */
    typedef WT              ANHE;

#define ANHE_w(he)        (he)
#define ANHE_at(he)       (he)->at
#define ANHE_at_cache(he)
#endif

#if EV_MULTIPLICITY

    struct ev_loop {
        ev_tstamp               ev_rt_now;
#define ev_rt_now ((loop)->ev_rt_now)
#define VAR(name,decl) decl;
#include "ev_vars.h"
#undef VAR
    };
#include "ev_wrap.h"

    static struct ev_loop   default_loop_struct;
            struct ev_loop          *easy_default_loop_ptr;

#else

    ev_tstamp               ev_rt_now;
#define VAR(name,decl) static decl;
#include "ev_vars.h"
#undef VAR

    static int              easy_default_loop_ptr;

#endif

#if EV_FEATURE_API
# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
# define EV_INVOKE_PENDING invoke_cb (EV_A)
#else
# define EV_RELEASE_CB (void)0
# define EV_ACQUIRE_CB (void)0
# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
#endif

#define EVBREAK_RECURSE 0x80

        /*****************************************************************************/

#ifndef EV_HAVE_EV_TIME
                ev_tstamp
        ev_time (void)
    {
#if EV_USE_REALTIME

        if (expect_true (have_realtime)) {
            struct timespec         ts;
            clock_gettime (CLOCK_REALTIME, &ts);
            return ts.tv_sec + ts.tv_nsec * 1e-9;
        }

#endif

        struct timeval          tv;
        gettimeofday (&tv, 0);
        return tv.tv_sec + tv.tv_usec * 1e-6;
    }
#endif

    inline_size ev_tstamp
    get_clock (void)
    {
#if EV_USE_MONOTONIC

        if (expect_true (have_monotonic)) {
            struct timespec         ts;
            clock_gettime (CLOCK_MONOTONIC, &ts);
            return ts.tv_sec + ts.tv_nsec * 1e-9;
        }

#endif

        return ev_time ();
    }

#if EV_MULTIPLICITY
    ev_tstamp
    ev_now (EV_P)
    {
        return ev_rt_now;
    }
#endif

    void
    ev_sleep (ev_tstamp delay)
    {
        if (delay > 0.) {
#if EV_USE_NANOSLEEP
            struct timespec         ts;

            EV_TS_SET (ts, delay);
            nanosleep (&ts, 0);
#elif defined(_WIN32)
            Sleep ((unsigned long)(delay * 1e3));
#else
            struct timeval          tv;

            /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
            /* something not guaranteed by newer posix versions, but guaranteed */
            /* by older ones */
            EV_TV_SET (tv, delay);
            select (0, 0, 0, 0, &tv);
#endif
        }
    }

    /*****************************************************************************/

#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */

    /* find a suitable new size for the given array, */
    /* hopefully by rounding to a nice-to-malloc size */
    inline_size int
    array_nextsize (int elem, int cur, int cnt)
    {
        int                     ncur = cur + 1;

        do
            ncur <<= 1;

        while (cnt > ncur);

        /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
        if (elem * ncur > (int)(MALLOC_ROUND - sizeof (void *) * 4)) {
            ncur                    *= elem;
            ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
            ncur = ncur - sizeof (void *) * 4;
            ncur /= elem;
        }

        return ncur;
    }

    static noinline void *
    array_realloc (int elem, void *base, int *cur, int cnt)
    {
        *cur = array_nextsize (elem, *cur, cnt);
        return ev_realloc (base, elem **cur);
    }

#define array_init_zero(base,count) \
    memset ((void *)(base), 0, sizeof (*(base)) * (count))

#define array_needsize(type,base,cur,cnt,init)          \
    if (expect_false ((cnt) > (cur)))             \
    {                               \
        int ocur_ __attribute__ ((unused)) = (cur);                    \
        (base) = (type *)array_realloc                \
                 (sizeof (type), (base), &(cur), (cnt));        \
        init ((base) + (ocur_), (cur) - ocur_);           \
    }

#if 0
#define array_slim(type,stem)                   \
    if (stem ## max < array_roundsize (stem ## cnt >> 2))     \
    {                               \
        stem ## max = array_roundsize (stem ## cnt >> 1);     \
        base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
        fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
    }
#endif

#define array_free(stem, idx) \
    ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0

    /*****************************************************************************/

    /* dummy callback for pending events */
    static void noinline
    pendingcb (EV_P_ ev_prepare *w, int revents)
    {
    }

    void noinline
    ev_feed_event (EV_P_ void *w, int revents)
    {
        W                       w_ = (W)w;
        int                     pri = ABSPRI (w_);

        if (expect_false (w_->pending))
            pendings [pri][w_->pending - 1].events |= revents;
        else {
            w_->pending = ++pendingcnt [pri];
            array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
            pendings [pri][w_->pending - 1].w      = w_;
            pendings [pri][w_->pending - 1].events = revents;
        }
    }

    inline_speed void
    feed_reverse (EV_P_ W w)
    {
        array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
        rfeeds [rfeedcnt++] = w;
    }

    inline_size void
    feed_reverse_done (EV_P_ int revents)
    {
        do
            ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);

        while (rfeedcnt);
    }

    inline_speed void
    queue_events (EV_P_ W *events, int eventcnt, int type)
    {
        int                     i;

        for (i = 0; i < eventcnt; ++i)
            ev_feed_event (EV_A_ events [i], type);
    }

    /*****************************************************************************/

    inline_speed void
    fd_event_nocheck (EV_P_ int fd, int revents)
    {
        ANFD                    *anfd = anfds + fd;
        ev_io                   *w;

        for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next) {
            assert(w != (ev_io *)((WL)w)->next);
            int                     ev = w->events & revents;

            if (ev)
                ev_feed_event (EV_A_ (W)w, ev);
        }
    }

    /* do not submit kernel events for fds that have reify set */
    /* because that means they changed while we were polling for new events */
    inline_speed void
    fd_event (EV_P_ int fd, int revents)
    {
        ANFD                    *anfd = anfds + fd;

        if (expect_true (!anfd->reify))
            fd_event_nocheck (EV_A_ fd, revents);
    }

    void
    ev_feed_fd_event (EV_P_ int fd, int revents)
    {
        if (fd >= 0 && fd < anfdmax)
            fd_event_nocheck (EV_A_ fd, revents);
    }

    /* make sure the external fd watch events are in-sync */
    /* with the kernel/libev internal state */
    inline_size void
    fd_reify (EV_P)
    {
        int                     i;

        for (i = 0; i < fdchangecnt; ++i) {
            int                     fd = fdchanges [i];
            ANFD                    *anfd = anfds + fd;
            ev_io                   *w;

            unsigned char           o_events = anfd->events;
            unsigned char           o_reify  = anfd->reify;

            anfd->reify  = 0;

#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP

            if (o_reify & EV__IOFDSET) {
                unsigned long           arg;
                anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
                assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
                printf ("oi %d %x\n", fd, anfd->handle);//D
            }

#endif

            /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
            {
                anfd->events = 0;

                for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next) {
                    assert(w != (ev_io *)((WL)w)->next);
                    anfd->events |= (unsigned char)w->events;
                }

                if (o_events != anfd->events)
                    o_reify = EV__IOFDSET; /* actually |= */
            }

            if (o_reify & EV__IOFDSET)
                backend_modify (EV_A_ fd, o_events, anfd->events);
        }

        fdchangecnt = 0;
    }

    /* something about the given fd changed */
    inline_size void
    fd_change (EV_P_ int fd, int flags)
    {
        unsigned char           reify = anfds [fd].reify;
        anfds [fd].reify |= flags;

        if (expect_true (!reify)) {
            ++fdchangecnt;
            array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
            fdchanges [fdchangecnt - 1] = fd;
        }
    }

    /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
    inline_speed void
    fd_kill (EV_P_ int fd)
    {
        ev_io                   *w;

        while ((w = (ev_io *)anfds [fd].head)) {
            ev_io_stop (EV_A_ w);
            ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
        }
    }

    /* check whether the given fd is actually valid, for error recovery */
    inline_size int
    fd_valid (int fd)
    {
#ifdef _WIN32
        return EV_FD_TO_WIN32_HANDLE (fd) != -1;
#else
        return fcntl (fd, F_GETFD) != -1;
#endif
    }

    /* called on EBADF to verify fds */
    static void noinline __attribute__ ((unused))
    fd_ebadf (EV_P)
    {
        int                     fd;

        for (fd = 0; fd < anfdmax; ++fd)
            if (anfds [fd].events)
                if (!fd_valid (fd) && errno == EBADF)
                    fd_kill (EV_A_ fd);
    }

    /* called on ENOMEM in select/poll to kill some fds and retry */
    static void noinline __attribute__ ((unused))
    fd_enomem (EV_P)
    {
        int                     fd;

        for (fd = anfdmax; fd--; )
            if (anfds [fd].events) {
                fd_kill (EV_A_ fd);
                break;
            }
    }

    /* usually called after fork if backend needs to re-arm all fds from scratch */
    static void noinline __attribute__ ((unused))
    fd_rearm_all (EV_P)
    {
        int                     fd;

        for (fd = 0; fd < anfdmax; ++fd)
            if (anfds [fd].events) {
                anfds [fd].events = 0;
                anfds [fd].emask  = 0;
                fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
            }
    }

    /* used to prepare libev internal fd's */
    /* this is not fork-safe */
    inline_speed void
    fd_intern (int fd)
    {
#ifdef _WIN32
        unsigned long           arg = 1;
        ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
#else
        fcntl (fd, F_SETFD, FD_CLOEXEC);
        fcntl (fd, F_SETFL, O_NONBLOCK);
#endif
    }

    /*****************************************************************************/

    /*
     * the heap functions want a real array index. array index 0 is guaranteed to not
     * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
     * the branching factor of the d-tree.
     */

    /*
     * at the moment we allow libev the luxury of two heaps,
     * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
     * which is more cache-efficient.
     * the difference is about 5% with 50000+ watchers.
     */
#if EV_USE_4HEAP

#define DHEAP 4
#define HEAP0 (DHEAP - 1) /* index of first element in heap */
#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
#define UPHEAP_DONE(p,k) ((p) == (k))

    /* away from the root */
    inline_speed void
    downheap (ANHE *heap, int N, int k)
    {
        ANHE                    he = heap [k];
        ANHE                    *E = heap + N + HEAP0;

        for (;;) {
            ev_tstamp               minat;
            ANHE                    *minpos;
            ANHE                    *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;

            /* find minimum child */
            if (expect_true (pos + DHEAP - 1 < E)) {
                /* fast path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));

                if (               ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));

                if (               ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));

                if (               ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
            } else if (pos < E) {
                /* slow path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));

                if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));

                if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));

                if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
            } else
                break;

            if (ANHE_at (he) <= minat)
                break;

            heap [k] = *minpos;
            ev_active (ANHE_w (*minpos)) = k;

            k = minpos - heap;
        }

        heap [k] = he;
        ev_active (ANHE_w (he)) = k;
    }

#else /* 4HEAP */

#define HEAP0 1
#define HPARENT(k) ((k) >> 1)
#define UPHEAP_DONE(p,k) (!(p))

    /* away from the root */
    inline_speed void
    downheap (ANHE *heap, int N, int k)
    {
        ANHE                    he = heap [k];

        for (;;) {
            int                     c = k << 1;

            if (c >= N + HEAP0)
                break;

            c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
                 ? 1 : 0;

            if (ANHE_at (he) <= ANHE_at (heap [c]))
                break;

            heap [k] = heap [c];
            ev_active (ANHE_w (heap [k])) = k;

            k = c;
        }

        heap [k] = he;
        ev_active (ANHE_w (he)) = k;
    }
#endif

    /* towards the root */
    inline_speed void
    upheap (ANHE *heap, int k)
    {
        ANHE                    he = heap [k];

        for (;;) {
            int                     p = HPARENT (k);

            if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
                break;

            heap [k] = heap [p];
            ev_active (ANHE_w (heap [k])) = k;
            k = p;
        }

        heap [k] = he;
        ev_active (ANHE_w (he)) = k;
    }

    /* move an element suitably so it is in a correct place */
    inline_size void
    adjustheap (ANHE *heap, int N, int k)
    {
        if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
            upheap (heap, k);
        else
            downheap (heap, N, k);
    }

    /* rebuild the heap: this function is used only once and executed rarely */
    inline_size void
    reheap (ANHE *heap, int N)
    {
        int                     i;

        /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
        /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
        for (i = 0; i < N; ++i)
            upheap (heap, i + HEAP0);
    }

    /*****************************************************************************/

    /* associate signal watchers to a signal signal */
    typedef struct {
        EV_ATOMIC_T             pending;
#if EV_MULTIPLICITY
        EV_P;
#endif
        WL                      head;
    } ANSIG;

    static ANSIG signals [EV_NSIG - 1];

    /*****************************************************************************/

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE

    static void noinline
    evpipe_init (EV_P)
    {
        if (!ev_is_active (&pipe_w)) {
# if EV_USE_EVENTFD
            //evfd = syscall(__NR_eventfd2, 0, EFD_NONBLOCK | EFD_CLOEXEC);
	    evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
            if (evfd < 0 && errno == EINVAL)
                //evfd = syscall(__NR_eventfd, 0, 0);
	        evfd = eventfd(0, 0);
            if (evfd >= 0) {
                evpipe [0] = -1;
                fd_intern (evfd); /* doing it twice doesn't hurt */
                ev_io_set (&pipe_w, evfd, EV_READ);
            } else
# endif
            {
                while (pipe (evpipe))
                    ev_syserr ("(libev) error creating signal/async pipe");

                fd_intern (evpipe [0]);
                fd_intern (evpipe [1]);
                fcntl (evpipe [0], F_SETFL, O_NONBLOCK | O_NOATIME);
                fcntl (evpipe [1], F_SETFL, O_NONBLOCK | O_NOATIME);
                ev_io_set (&pipe_w, evpipe [0], EV_READ);
            }

            ev_io_start (EV_A_ & pipe_w);
            ev_unref (EV_A); /* watcher should not keep loop alive */
        }
    }

    inline_size void
    evpipe_write (EV_P_ EV_ATOMIC_T *flag)
    {
        if (!*flag) {
            int                     ret __attribute__ ((unused));
            int                     old_errno = errno; /* save errno because write might clobber it */
            char                    dummy = 'c';

            *flag = 1;

#if EV_USE_EVENTFD

            if (evfd >= 0) {
                uint64_t                counter = 1;
                ret = write (evfd, &counter, sizeof (uint64_t));
            } else
#endif
                /* win32 people keep sending patches that change this write() to send() */
                /* and then run away. but send() is wrong, it wants a socket handle on win32 */
                /* so when you think this write should be a send instead, please find out */
                /* where your send() is from - it's definitely not the microsoft send, and */
                /* tell me. thank you. */
                ret = write (evpipe [1], &dummy, 1);

            errno = old_errno;
        }
    }

    /* called whenever the libev signal pipe */
    /* got some events (signal, async) */
    static void
    pipecb (EV_P_ ev_io *iow, int revents)
    {
        int                     i;

#if EV_USE_EVENTFD

        if (evfd >= 0) {
            uint64_t                counter;
            counter = read (evfd, &counter, sizeof (uint64_t));
        } else
#endif
        {
            char                    dummy;
            /* see discussion in evpipe_write when you think this read should be recv in win32 */
            i = read (evpipe [0], &dummy, 1);
        }

        if (sig_pending) {
            sig_pending = 0;

            for (i = EV_NSIG - 1; i--; )
                if (expect_false (signals [i].pending))
                    ev_feed_signal_event (EV_A_ i + 1);
        }

#if EV_ASYNC_ENABLE

        if (async_pending) {
            async_pending = 0;
            ev_mb();

            for (i = asynccnt; i--; )
                if (asyncs [i]->sent) {
                    asyncs [i]->sent = 0;
                    ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
                }
        }

#endif
    }

    ///*****************************************************************************/

    static void
    ev_sighandler (int signum)
    {
#if EV_MULTIPLICITY
        EV_P = signals [signum - 1].loop;
#endif

#ifdef _WIN32
        signal (signum, ev_sighandler);
#endif

        signals [signum - 1].pending = 1;
        evpipe_write (EV_A_ & sig_pending);
    }

    void noinline
    ev_feed_signal_event (EV_P_ int signum)
    {
        WL                      w;

        if (expect_false (signum <= 0 || signum > EV_NSIG))
            return;

        --signum;

#if EV_MULTIPLICITY
        /* it is permissible to try to feed a signal to the wrong loop */
        /* or, likely more useful, feeding a signal nobody is waiting for */

        if (expect_false (signals [signum].loop != EV_A))
            return;

#endif

        signals [signum].pending = 0;

        for (w = signals [signum].head; w; w = w->next)
            ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
    }

#if EV_USE_SIGNALFD
    static void
    sigfdcb (EV_P_ ev_io *iow, int revents)
    {
        struct signalfd_siginfo si[2], *sip; /* these structs are big */

        for (;;) {
            ssize_t                 res = read (sigfd, si, sizeof (si));

            /* not ISO-C, as res might be -1, but works with SuS */
            for (sip = si; (char *)sip < (char *)si + res; ++sip)
                ev_feed_signal_event (EV_A_ sip->ssi_signo);

            if (res < (ssize_t)sizeof (si))
                break;
        }
    }
#endif

#endif

    /*****************************************************************************/

#if EV_CHILD_ENABLE
    static WL               childs [EV_PID_HASHSIZE];

    static ev_signal        childev;

#ifndef WIFCONTINUED
# define WIFCONTINUED(status) 0
#endif

    /* handle a single child status event */
    inline_speed void
    child_reap (EV_P_ int chain, int pid, int status)
    {
        ev_child                *w;
        int                     traced = WIFSTOPPED (status) || WIFCONTINUED (status);

        for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next) {
            if ((w->pid == pid || !w->pid)
                    && (!traced || (w->flags & 1))) {
                ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
                w->rpid    = pid;
                w->rstatus = status;
                ev_feed_event (EV_A_ (W)w, EV_CHILD);
            }
        }
    }

#ifndef WCONTINUED
# define WCONTINUED 0
#endif

    /* called on sigchld etc., calls waitpid */
    static void
    childcb (EV_P_ ev_signal *sw, int revents)
    {
        int                     pid, status;

        /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
        if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
            if (!WCONTINUED
                    || errno != EINVAL
                    || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
                return;

        /* make sure we are called again until all children have been reaped */
        /* we need to do it this way so that the callback gets called before we continue */
        ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);

        child_reap (EV_A_ pid, pid, status);

        if ((EV_PID_HASHSIZE) > 1)
            child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
    }

#endif

    /*****************************************************************************/

#if EV_USE_EPOLL
# include "ev_epoll.c"
#endif
#if EV_USE_SELECT
# include "ev_select.c"
#endif

    int
    ev_version_major (void)
    {
        return EV_VERSION_MAJOR;
    }

    int
    ev_version_minor (void)
    {
        return EV_VERSION_MINOR;
    }

    ///* return true if we are running with elevated privileges and should ignore env variables */

    int inline_size
    enable_secure (void)
    {
#ifdef _WIN32
        return 0;
#else
        return getuid () != geteuid ()
               || getgid () != getegid ();
#endif
    }

    unsigned int
    ev_supported_backends (void)
    {
        unsigned int            flags = 0;

        if (EV_USE_PORT  ) flags |= EVBACKEND_PORT;

        if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;

        if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;

        if (EV_USE_POLL  ) flags |= EVBACKEND_POLL;

        if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;

        return flags;
    }

    unsigned int
    ev_recommended_backends (void)
    {
        unsigned int            flags = ev_supported_backends ();

#ifndef __NetBSD__
        /* kqueue is borked on everything but netbsd apparently */
        /* it usually doesn't work correctly on anything but sockets and pipes */
        flags &= ~EVBACKEND_KQUEUE;
#endif
#ifdef __APPLE__
        /* only select works correctly on that "unix-certified" platform */
        flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
        flags &= ~EVBACKEND_POLL;   /* poll is based on kqueue from 10.5 onwards */
#endif
#ifdef __FreeBSD__
        flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
#endif

        return flags;
    }

    unsigned int
    ev_embeddable_backends (void)
    {
        int                     flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;

        /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
        if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
            flags &= ~EVBACKEND_EPOLL;

        return flags;
    }

    unsigned int
    ev_backend (EV_P)
    {
        return backend;
    }

#if EV_FEATURE_API
    unsigned int
    ev_iteration (EV_P)
    {
        return loop_count;
    }

    unsigned int
    ev_depth (EV_P)
    {
        return loop_depth;
    }

    void
    ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
    {
        io_blocktime = interval;
    }

    void
    ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
    {
        timeout_blocktime = interval;
    }

    void
    ev_set_userdata (EV_P_ void *data)
    {
        userdata = data;
    }

    void *
    ev_userdata (EV_P)
    {
        return userdata;
    }

    void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
    {
        invoke_cb = invoke_pending_cb;
    }

    void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
    {
        release_cb = release;
        acquire_cb = acquire;
    }
#endif

    /* initialise a loop structure, must be zero-initialised */
    static void noinline
    loop_init (EV_P_ unsigned int flags)
    {
        if (!backend) {
#if EV_USE_REALTIME

            if (!have_realtime) {
                struct timespec         ts;

                if (!clock_gettime (CLOCK_REALTIME, &ts))
                    have_realtime = 1;
            }

#endif

#if EV_USE_MONOTONIC

            if (!have_monotonic) {
                struct timespec         ts;

                if (!clock_gettime (CLOCK_MONOTONIC, &ts))
                    have_monotonic = 1;
            }

#endif

            /* pid check not overridable via env */
#ifndef _WIN32

            if (flags & EVFLAG_FORKCHECK)
                curpid = getpid ();

#endif

            if (!(flags & EVFLAG_NOENV)
                    && !enable_secure ()
                    && getenv ("LIBEV_FLAGS"))
                flags = atoi (getenv ("LIBEV_FLAGS"));

            ev_rt_now         = ev_time ();
            mn_now            = get_clock ();
            now_floor         = mn_now;
            rtmn_diff         = ev_rt_now - mn_now;
#if EV_FEATURE_API
            invoke_cb         = ev_invoke_pending;
#endif

            io_blocktime      = 0.;
            timeout_blocktime = 0.;
            backend           = 0;
            backend_fd        = -1;
            sig_pending       = 0;
#if EV_ASYNC_ENABLE
            async_pending     = 0;
#endif
#if EV_USE_INOTIFY
            fs_fd             = flags & EVFLAG_NOINOTIFY ? -1 : -2;
#endif
#if EV_USE_SIGNALFD
            sigfd             = flags & EVFLAG_SIGNALFD  ? -2 : -1;
#endif

            if (!(flags & 0x0000ffffU))
                flags |= ev_recommended_backends ();

#if EV_USE_EPOLL

            if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init  (EV_A_ flags);

#endif
#if EV_USE_SELECT

            if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);

#endif

            ev_prepare_init (&pending_w, pendingcb);

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
            ev_init (&pipe_w, pipecb);
            ev_set_priority (&pipe_w, EV_MAXPRI);
#endif
        }
    }

    /* free up a loop structure */
    void
    ev_loop_destroy (EV_P)
    {
        int                     i;

#if EV_MULTIPLICITY

        /* mimic free (0) */
        if (!EV_A)
            return;

#endif

#if EV_CLEANUP_ENABLE

        /* queue cleanup watchers (and execute them) */
        if (expect_false (cleanupcnt)) {
            queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
            EV_INVOKE_PENDING;
        }

#endif

#if EV_CHILD_ENABLE

        if (ev_is_active (&childev)) {
            ev_ref (EV_A); /* child watcher */
            ev_signal_stop (EV_A_ & childev);
        }

#endif

        if (ev_is_active (&pipe_w)) {
            /*ev_ref (EV_A);*/
            /*ev_io_stop (EV_A_ &pipe_w);*/

#if EV_USE_EVENTFD
            if (evfd >= 0)
                close (evfd);

#endif

            if (evpipe [0] >= 0) {
                EV_WIN32_CLOSE_FD (evpipe [0]);
                EV_WIN32_CLOSE_FD (evpipe [1]);
            }
        }

#if EV_USE_SIGNALFD

        if (ev_is_active (&sigfd_w))
            close (sigfd);

#endif

#if EV_USE_INOTIFY

        if (fs_fd >= 0)
            close (fs_fd);

#endif

        if (backend_fd >= 0)
            close (backend_fd);

#if EV_USE_EPOLL

        if (backend == EVBACKEND_EPOLL ) epoll_destroy  (EV_A);

#endif
#if EV_USE_SELECT

        if (backend == EVBACKEND_SELECT) select_destroy (EV_A);

#endif

        for (i = NUMPRI; i--; ) {
            array_free (pending, [i]);
#if EV_IDLE_ENABLE
            array_free (idle, [i]);
#endif
        }

        ev_free (anfds);
        anfds = 0;
        anfdmax = 0;

        /* have to use the microsoft-never-gets-it-right macro */
        array_free (rfeed, EMPTY);
        array_free (fdchange, EMPTY);
        array_free (timer, EMPTY);
#if EV_PERIODIC_ENABLE
        array_free (periodic, EMPTY);
#endif
#if EV_FORK_ENABLE
        array_free (fork, EMPTY);
#endif
#if EV_CLEANUP_ENABLE
        array_free (cleanup, EMPTY);
#endif
        array_free (prepare, EMPTY);
        array_free (check, EMPTY);
#if EV_ASYNC_ENABLE
        array_free (async, EMPTY);
#endif

        backend = 0;

#if EV_MULTIPLICITY

        if (ev_is_default_loop (EV_A))
#endif
            easy_default_loop_ptr = 0;

#if EV_MULTIPLICITY
        else
            ev_free (EV_A);

#endif
    }

#if EV_USE_INOTIFY
    inline_size void infy_fork (EV_P);
#endif

    inline_size void
    loop_fork (EV_P)
    {
#if EV_USE_PORT

        if (backend == EVBACKEND_PORT  ) port_fork   (EV_A);

#endif
#if EV_USE_KQUEUE

        if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);

#endif
#if EV_USE_EPOLL

        if (backend == EVBACKEND_EPOLL ) epoll_fork  (EV_A);

#endif
#if EV_USE_INOTIFY
        infy_fork (EV_A);
#endif

        if (ev_is_active (&pipe_w)) {
            /* this "locks" the handlers against writing to the pipe */
            /* while we modify the fd vars */
            sig_pending   = 1;
#if EV_ASYNC_ENABLE
            async_pending = 1;
#endif

            ev_ref (EV_A);
            ev_io_stop (EV_A_ & pipe_w);

#if EV_USE_EVENTFD

            if (evfd >= 0)
                close (evfd);

#endif

            if (evpipe [0] >= 0) {
                EV_WIN32_CLOSE_FD (evpipe [0]);
                EV_WIN32_CLOSE_FD (evpipe [1]);
            }

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
            evpipe_init (EV_A);
            /* now iterate over everything, in case we missed something */
            pipecb (EV_A_ & pipe_w, EV_READ);
#endif
        }

        postfork = 0;
    }

#if EV_MULTIPLICITY

    struct ev_loop *
    ev_loop_new (unsigned int flags)
    {
        EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));

        memset (EV_A, 0, sizeof (struct ev_loop));
        loop_init (EV_A_ flags);

        if (ev_backend (EV_A))
            return EV_A;

        ev_free (EV_A);
        return 0;
    }

#endif /* multiplicity */

#if EV_VERIFY
    static void noinline
    verify_watcher (EV_P_ W w)
    {
        assert (("libev: watcher has invalid priority" && (ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI)));

        if (w->pending)
            assert (("libev: pending watcher not on pending queue" && (pendings [ABSPRI (w)][w->pending - 1].w == w)));
    }

    static void noinline
    verify_heap (EV_P_ ANHE *heap, int N)
    {
        int                     i;

        for (i = HEAP0; i < N + HEAP0; ++i) {
            assert (("libev: active index mismatch in heap" && (ev_active (ANHE_w (heap [i])) == i)));
            assert (("libev: heap condition violated" && (i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i]))));
            assert (("libev: heap at cache mismatch" && (ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i])))));

            verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
        }
    }

    static void noinline
    array_verify (EV_P_ W *ws, int cnt)
    {
        while (cnt--) {
            assert (("libev: active index mismatch" && (ev_active (ws [cnt]) == cnt + 1)));
            verify_watcher (EV_A_ ws [cnt]);
        }
    }
#endif

#if EV_FEATURE_API
    void
    ev_verify (EV_P)
    {
#if EV_VERIFY
        int                     i;
        WL                      w;

        assert (activecnt >= -1);

        assert (fdchangemax >= fdchangecnt);

        for (i = 0; i < fdchangecnt; ++i)
            assert (("libev: negative fd in fdchanges" && (fdchanges [i] >= 0)));

        assert (anfdmax >= 0);

        for (i = 0; i < anfdmax; ++i)
            for (w = anfds [i].head; w; w = w->next) {
                verify_watcher (EV_A_ (W)w);
                assert (("libev: inactive fd watcher on anfd list" && (ev_active (w) == 1)));
                assert (("libev: fd mismatch between watcher and anfd" && (((ev_io *)w)->fd == i)));
            }

        assert (timermax >= timercnt);
        verify_heap (EV_A_ timers, timercnt);

#if EV_PERIODIC_ENABLE
        assert (periodicmax >= periodiccnt);
        verify_heap (EV_A_ periodics, periodiccnt);
#endif

        for (i = NUMPRI; i--; ) {
            assert (pendingmax [i] >= pendingcnt [i]);
#if EV_IDLE_ENABLE
            assert (idleall >= 0);
            assert (idlemax [i] >= idlecnt [i]);
            array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
#endif
        }

#if EV_FORK_ENABLE
        assert (forkmax >= forkcnt);
        array_verify (EV_A_ (W *)forks, forkcnt);
#endif

#if EV_CLEANUP_ENABLE
        assert (cleanupmax >= cleanupcnt);
        array_verify (EV_A_ (W *)cleanups, cleanupcnt);
#endif

#if EV_ASYNC_ENABLE
        assert (asyncmax >= asynccnt);
        array_verify (EV_A_ (W *)asyncs, asynccnt);
#endif

#if EV_PREPARE_ENABLE
        assert (preparemax >= preparecnt);
        array_verify (EV_A_ (W *)prepares, preparecnt);
#endif

#if EV_CHECK_ENABLE
        assert (checkmax >= checkcnt);
        array_verify (EV_A_ (W *)checks, checkcnt);
#endif

# if 0
#if EV_CHILD_ENABLE

        for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
            for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
#endif
# endif
#endif
                }
#endif

#if EV_MULTIPLICITY
    struct ev_loop *
#else
    int
#endif
    ev_default_loop (unsigned int flags)
    {
        if (!easy_default_loop_ptr) {
#if EV_MULTIPLICITY
            EV_P = easy_default_loop_ptr = &default_loop_struct;
#else
            easy_default_loop_ptr = 1;
#endif

            loop_init (EV_A_ flags);

            if (ev_backend (EV_A)) {
#if EV_CHILD_ENABLE
                ev_signal_init (&childev, childcb, SIGCHLD);
                ev_set_priority (&childev, EV_MAXPRI);
                ev_signal_start (EV_A_ & childev);
                ev_unref (EV_A); /* child watcher should not keep loop alive */
#endif
            } else
                easy_default_loop_ptr = 0;
        }

        return easy_default_loop_ptr;
    }

    void
    ev_loop_fork (EV_P)
    {
        postfork = 1; /* must be in line with ev_default_fork */
    }

    /*****************************************************************************/

    void
    ev_invoke (EV_P_ void *w, int revents)
    {
        EV_CB_INVOKE ((W)w, revents);
    }

    unsigned int
    ev_pending_count (EV_P)
    {
        int                     pri;
        unsigned int            count = 0;

        for (pri = NUMPRI; pri--; )
            count += pendingcnt [pri];

        return count;
    }

    void noinline
    ev_invoke_pending (EV_P)
    {
        int                     pri;

        int64_t before_handler_time  = current_time();

        uint64_t       count = 0;
        ev_malloc_count = 0;
        ev_malloc_time = 0;
        ev_write_count = 0;
        ev_write_time = 0;
        ev_read_count = 0;
        ev_read_time = 0;
        ev_client_cb_count = 0;
        ev_client_cb_time = 0;
        ev_server_process_count = 0;
        ev_server_process_time = 0;
        for (pri = NUMPRI; pri--; )
            while (pendingcnt [pri]) {
                ANPENDING               *p = pendings [pri] + --pendingcnt [pri];
                ev_watch_pending_addr = (void *)p;
                ev_watch_pending      = pendingcnt [pri] + 1;

                /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
                /* ^ this is no longer true, as pending_w could be here */

                p->w->pending = 0;
                EV_CB_INVOKE (p->w, p->events);
                ++count;
                EV_FREQUENT_CHECK;
            }
        int64_t diff_epoll_handler = current_time() - before_handler_time;
        if (diff_epoll_handler > ev_loop_warn_threshold) {
          easy_warn_log("epoll handler too much time :%ld count=%ld malloc=%ld/%ld write=%ld/%ld read=%ld/%ld server_process=%ld/%ld client_cb=%ld/%ld", diff_epoll_handler, count, ev_malloc_time, ev_malloc_count, ev_write_time, ev_write_count, ev_read_time, ev_read_count, ev_server_process_time, ev_server_process_count, ev_client_cb_time, ev_client_cb_count);
        }
    }

#if EV_IDLE_ENABLE
    /* make idle watchers pending. this handles the "call-idle */
    /* only when higher priorities are idle" logic */
    inline_size void
    idle_reify (EV_P)
    {
        if (expect_false (idleall)) {
            int                     pri;

            for (pri = NUMPRI; pri--; ) {
                if (pendingcnt [pri])
                    break;

                if (idlecnt [pri]) {
                    queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
                    break;
                }
            }
        }
    }
#endif

    /* make timers pending */
    inline_size void
    timers_reify (EV_P)
    {
        EV_FREQUENT_CHECK;

        if (timercnt && ANHE_at (timers [HEAP0]) < mn_now) {
            do {
                ev_timer                *w = (ev_timer *)ANHE_w (timers [HEAP0]);

                /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/

                /* first reschedule or stop timer */
                if (w->repeat) {
                    ev_at (w) += w->repeat;

                    if (ev_at (w) < mn_now)
                        ev_at (w) = mn_now;

                    assert (("libev: negative ev_timer repeat value found while processing timers" && (w->repeat > 0.)));

                    ANHE_at_cache (timers [HEAP0]);
                    downheap (timers, timercnt, HEAP0);
                } else
                    ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */

                EV_FREQUENT_CHECK;
                feed_reverse (EV_A_ (W)w);
            } while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);

            feed_reverse_done (EV_A_ EV_TIMER);
        }
    }

#if EV_PERIODIC_ENABLE
    /* make periodics pending */
    inline_size void
    periodics_reify (EV_P)
    {
        EV_FREQUENT_CHECK;

        while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now) {
            do {
                ev_periodic             *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);

                /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/

                /* first reschedule or stop timer */
                if (w->reschedule_cb) {
                    ev_at (w) = w->reschedule_cb (w, ev_rt_now);

                    assert (("libev: ev_periodic reschedule callback returned time in the past" && (ev_at (w) >= ev_rt_now)));

                    ANHE_at_cache (periodics [HEAP0]);
                    downheap (periodics, periodiccnt, HEAP0);
                } else if (w->interval) {
                    ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;

                    /* if next trigger time is not sufficiently in the future, put it there */
                    /* this might happen because of floating point inexactness */
                    if (ev_at (w) - ev_rt_now < TIME_EPSILON) {
                        ev_at (w) += w->interval;

                        /* if interval is unreasonably low we might still have a time in the past */
                        /* so correct this. this will make the periodic very inexact, but the user */
                        /* has effectively asked to get triggered more often than possible */
                        if (ev_at (w) < ev_rt_now)
                            ev_at (w) = ev_rt_now;
                    }

                    ANHE_at_cache (periodics [HEAP0]);
                    downheap (periodics, periodiccnt, HEAP0);
                } else
                    ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */

                EV_FREQUENT_CHECK;
                feed_reverse (EV_A_ (W)w);
            } while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);

            feed_reverse_done (EV_A_ EV_PERIODIC);
        }
    }

    /* simply recalculate all periodics */
    /* TODO: maybe ensure that at least one event happens when jumping forward? */
    static void noinline
    periodics_reschedule (EV_P)
    {
        int                     i;

        /* adjust periodics after time jump */
        for (i = HEAP0; i < periodiccnt + HEAP0; ++i) {
            ev_periodic             *w = (ev_periodic *)ANHE_w (periodics [i]);

            if (w->reschedule_cb)
                ev_at (w) = w->reschedule_cb (w, ev_rt_now);
            else if (w->interval)
                ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;

            ANHE_at_cache (periodics [i]);
        }

        reheap (periodics, periodiccnt);
    }
#endif

    /* adjust all timers by a given offset */
    static void noinline
    timers_reschedule (EV_P_ ev_tstamp adjust)
    {
        int                     i;

        for (i = 0; i < timercnt; ++i) {
            ANHE                    *he = timers + i + HEAP0;
            ANHE_w (*he)->at += adjust;
            ANHE_at_cache (*he);
        }
    }

    /* fetch new monotonic and realtime times from the kernel */
    /* also detect if there was a timejump, and act accordingly */
    inline_speed void
    time_update (EV_P_ ev_tstamp max_block)
    {
#if EV_USE_MONOTONIC

        if (expect_true (have_monotonic)) {
            int                     i;
            ev_tstamp               odiff = rtmn_diff;

            mn_now = get_clock ();

            /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
            /* interpolate in the meantime */
            if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5)) {
                ev_rt_now = rtmn_diff + mn_now;
                return;
            }

            now_floor = mn_now;
            ev_rt_now = ev_time ();

            /* loop a few times, before making important decisions.
             * on the choice of "4": one iteration isn't enough,
             * in case we get preempted during the calls to
             * ev_time and get_clock. a second call is almost guaranteed
             * to succeed in that case, though. and looping a few more times
             * doesn't hurt either as we only do this on time-jumps or
             * in the unlikely event of having been preempted here.
             */
            for (i = 4; --i; ) {
                rtmn_diff = ev_rt_now - mn_now;

                if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
                    return; /* all is well */

                ev_rt_now = ev_time ();
                mn_now    = get_clock ();
                now_floor = mn_now;
            }

            /* no timer adjustment, as the monotonic clock doesn't jump */
            /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
# if EV_PERIODIC_ENABLE
            periodics_reschedule (EV_A);
# endif
        } else
#endif
        {
            ev_rt_now = ev_time ();

            if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP)) {
                /* adjust timers. this is easy, as the offset is the same for all of them */
                timers_reschedule (EV_A_ ev_rt_now - mn_now);
#if EV_PERIODIC_ENABLE
                periodics_reschedule (EV_A);
#endif
            }

            mn_now = ev_rt_now;
        }
    }

  inline int64_t current_time()
  {
    struct timeval t;
    if (gettimeofday(&t, NULL) < 0) {
      easy_error_log("get time of day failed");
    }
    return ((t.tv_sec) * 1000000 + t.tv_usec);
  }

    void
    ev_run (EV_P_ int flags)
    {
#if EV_FEATURE_API
        ++loop_depth;
#endif

        assert (("libev: ev_loop recursion during release detected" && (loop_done != EVBREAK_RECURSE)));

        loop_done = EVBREAK_CANCEL;

        EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */

        do {
#if EV_VERIFY >= 2
            ev_verify (EV_A);
#endif

#ifndef _WIN32

            if (expect_false (curpid)) /* penalise the forking check even more */
                if (expect_false (getpid () != curpid)) {
                    curpid = getpid ();
                    postfork = 1;
                }

#endif

#if EV_FORK_ENABLE

            /* we might have forked, so queue fork handlers */
            if (expect_false (postfork))
                if (forkcnt) {
                    queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
                    EV_INVOKE_PENDING;
                }

#endif

#if EV_PREPARE_ENABLE

            /* queue prepare watchers (and execute them) */
            if (expect_false (preparecnt)) {
                queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
                EV_INVOKE_PENDING;
            }

#endif

            if (expect_false (loop_done))
                break;

            /* we might have forked, so reify kernel state if necessary */
            if (expect_false (postfork))
                loop_fork (EV_A);

            /* update fd-related kernel structures */
            fd_reify (EV_A);

            /* calculate blocking time */
            {
                ev_tstamp               waittime  = 0.;
                ev_tstamp               sleeptime = 0.;

                /* remember old timestamp for io_blocktime calculation */
                ev_tstamp               prev_mn_now = mn_now;

                /* update time to cancel out callback processing overhead */
                time_update (EV_A_ 1e100);

                if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt))) {
                    waittime = MAX_BLOCKTIME;

                    if (timercnt) {
                        ev_tstamp               to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;

                        if (waittime > to) waittime = to;
                    }

#if EV_PERIODIC_ENABLE

                    if (periodiccnt) {
                        ev_tstamp               to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;

                        if (waittime > to) waittime = to;
                    }

#endif

                    /* don't let timeouts decrease the waittime below timeout_blocktime */
                    if (expect_false (waittime < timeout_blocktime))
                        waittime = timeout_blocktime;

                    /* extra check because io_blocktime is commonly 0 */
                    if (expect_false (io_blocktime)) {
                        sleeptime = io_blocktime - (mn_now - prev_mn_now);

                        if (sleeptime > waittime - backend_fudge)
                            sleeptime = waittime - backend_fudge;

                        if (expect_true (sleeptime > 0.)) {
                            ev_sleep (sleeptime);
                            waittime -= sleeptime;
                        }
                    }
                }

#if EV_FEATURE_API
                ++loop_count;
#endif
                assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */

                backend_poll (EV_A_ waittime);
                assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */

                /* update ev_rt_now, do magic */
                time_update (EV_A_ waittime + sleeptime);
            }

            /* queue pending timers and reschedule them */
            timers_reify (EV_A); /* relative timers called last */
#if EV_PERIODIC_ENABLE
            periodics_reify (EV_A); /* absolute timers called first */
#endif

#if EV_IDLE_ENABLE
            /* queue idle watchers unless other events are pending */
            idle_reify (EV_A);
#endif

#if EV_CHECK_ENABLE

            /* queue check watchers, to be executed first */
            if (expect_false (checkcnt))
                queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);

#endif

            EV_INVOKE_PENDING;
        } while (expect_true (
                     activecnt
                     && !loop_done
                     && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
                 ));

        if (loop_done == EVBREAK_ONE)
            loop_done = EVBREAK_CANCEL;

#if EV_FEATURE_API
        --loop_depth;
#endif
    }

    void
    ev_break (EV_P_ int how)
    {
        loop_done = how;
    }

    void
    ev_ref (EV_P)
    {
        ++activecnt;
    }

    void
    ev_unref (EV_P)
    {
        --activecnt;
    }

    void
    ev_now_update (EV_P)
    {
        time_update (EV_A_ 1e100);
    }

    void
    ev_suspend (EV_P)
    {
        ev_now_update (EV_A);
    }

    void
    ev_resume (EV_P)
    {
        ev_tstamp               mn_prev = mn_now;

        ev_now_update (EV_A);
        timers_reschedule (EV_A_ mn_now - mn_prev);
#if EV_PERIODIC_ENABLE
        /* TODO: really do this? */
        periodics_reschedule (EV_A);
#endif
    }

    /*****************************************************************************/
    /* singly-linked list management, used when the expected list length is short */

    inline_size void
    wlist_add (WL *head, WL elem)
    {
        elem->next = *head;
        *head = elem;
    }

    inline_size void
    wlist_del (WL *head, WL elem)
    {
        while (*head) {
            if (expect_true (*head == elem)) {
                *head = elem->next;
                break;
            }

            head = &(*head)->next;
        }
    }

    /* internal, faster, version of ev_clear_pending */
    inline_speed void
    clear_pending (EV_P_ W w)
    {
        if (w->pending) {
            pendings [ABSPRI (w)][w->pending - 1].w = (W)(void *)&pending_w;
            ev_watch_pending_addr = (void *)(pendings [ABSPRI (w)] + w->pending - 1);
            ev_watch_pending = w->pending;
            w->pending = 0;
        }
    }

    int
    ev_clear_pending (EV_P_ void *w)
    {
        W                       w_ = (W)w;
        int                     pending = w_->pending;

        if (expect_true (pending)) {
            ANPENDING               *p = pendings [ABSPRI (w_)] + pending - 1;
            p->w = (W)(void *)&pending_w;
            w_->pending = 0;
            return p->events;
        } else
            return 0;
    }

    inline_size void
    pri_adjust (EV_P_ W w)
    {
        int                     pri = ev_priority (w);
        pri = pri < EV_MINPRI ? EV_MINPRI : pri;
        pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
        ev_set_priority (w, pri);
    }

    inline_speed void
    ev_start (EV_P_ W w, int active)
    {
        pri_adjust (EV_A_ w);
        w->active = active;
        ev_ref (EV_A);
    }

    inline_size void
    ev_stop (EV_P_ W w)
    {
        ev_unref (EV_A);
        w->active = 0;
    }

    /*****************************************************************************/

    void noinline
    ev_io_start (EV_P_ ev_io *w)
    {
        int                     fd = w->fd;

        if (expect_false (ev_is_active (w)))
            return;

        assert (("libev: ev_io_start called with negative fd" && (fd >= 0)));
        assert (("libev: ev_io_start called with illegal event mask" && (!(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE | EV_CLEANUP)))));

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, 1);
        array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
        wlist_add (&anfds[fd].head, (WL)w);

        fd_change (EV_A_ fd, ((w->events & EV__IOFDSET) | EV_ANFD_REIFY));

        if ((w->events & EV_CLEANUP)) anfds [fd].cdel = 1;

        w->events &= ~(EV__IOFDSET | EV_CLEANUP);

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_io_stop (EV_P_ ev_io *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)" && (w->fd >= 0 && w->fd < anfdmax)));

        EV_FREQUENT_CHECK;

        wlist_del (&anfds[w->fd].head, (WL)w);
        ev_stop (EV_A_ (W)w);

        fd_change (EV_A_ w->fd, EV_ANFD_REIFY);

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_io_stop_ctrl (EV_P_ ev_io *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)" && (w->fd >= 0 && w->fd < anfdmax)));

        EV_FREQUENT_CHECK;

        wlist_del (&anfds[w->fd].head, (WL)w);
        ev_stop (EV_A_ (W)w);
        char old = anfds[w->fd].cdel;
        anfds[w->fd].cdel = 1;
        backend_modify (EV_A_ w->fd, 0, 0);
        anfds[w->fd].cdel = old;
        anfds[w->fd].events = 0;

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_timer_start (EV_P_ ev_timer *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        ev_at (w) += mn_now;

        assert (("libev: ev_timer_start called with negative timer repeat value" && (w->repeat >= 0.)));

        EV_FREQUENT_CHECK;

        ++timercnt;
        ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
        array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
        ANHE_w (timers [ev_active (w)]) = (WT)w;
        ANHE_at_cache (timers [ev_active (w)]);
        upheap (timers, ev_active (w));

        EV_FREQUENT_CHECK;

        /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
    }

    void noinline
    ev_timer_stop (EV_P_ ev_timer *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            assert (("libev: internal timer heap corruption" && (ANHE_w (timers [active]) == (WT)w)));

            --timercnt;

            if (expect_true (active < timercnt + HEAP0)) {
                timers [active] = timers [timercnt + HEAP0];
                adjustheap (timers, timercnt, active);
            }
        }

        ev_at (w) -= mn_now;

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_timer_again (EV_P_ ev_timer *w)
    {
        EV_FREQUENT_CHECK;

        if (ev_is_active (w)) {
            if (w->repeat) {
                ev_at (w) = mn_now + w->repeat;
                ANHE_at_cache (timers [ev_active (w)]);
                adjustheap (timers, timercnt, ev_active (w));
            } else
                ev_timer_stop (EV_A_ w);
        } else if (w->repeat) {
            ev_at (w) = w->repeat;
            ev_timer_start (EV_A_ w);
        }

        EV_FREQUENT_CHECK;
    }

    ev_tstamp
    ev_timer_remaining (EV_P_ ev_timer *w)
    {
        return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
    }

#if EV_PERIODIC_ENABLE
    void noinline
    ev_periodic_start (EV_P_ ev_periodic *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        if (w->reschedule_cb)
            ev_at (w) = w->reschedule_cb (w, ev_rt_now);
        else if (w->interval) {
            assert (("libev: ev_periodic_start called with negative interval value" && (w->interval >= 0.)));
            /* this formula differs from the one in periodic_reify because we do not always round up */
            ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
        } else
            ev_at (w) = w->offset;

        EV_FREQUENT_CHECK;

        ++periodiccnt;
        ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
        array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
        ANHE_w (periodics [ev_active (w)]) = (WT)w;
        ANHE_at_cache (periodics [ev_active (w)]);
        upheap (periodics, ev_active (w));

        EV_FREQUENT_CHECK;

        /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
    }

    void noinline
    ev_periodic_stop (EV_P_ ev_periodic *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            assert (("libev: internal periodic heap corruption" && (ANHE_w (periodics [active]) == (WT)w)));

            --periodiccnt;

            if (expect_true (active < periodiccnt + HEAP0)) {
                periodics [active] = periodics [periodiccnt + HEAP0];
                adjustheap (periodics, periodiccnt, active);
            }
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_periodic_again (EV_P_ ev_periodic *w)
    {
        /* TODO: use adjustheap and recalculation */
        ev_periodic_stop (EV_A_ w);
        ev_periodic_start (EV_A_ w);
    }
#endif

#ifndef SA_RESTART
# define SA_RESTART 0
#endif

#if EV_SIGNAL_ENABLE

    void noinline
    ev_signal_start (EV_P_ ev_signal *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        assert (("libev: ev_signal_start called with illegal signal number" && (w->signum > 0 && w->signum < EV_NSIG)));

#if EV_MULTIPLICITY
        assert (("libev: a signal must not be attached to two different loops" &&
                 (!signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop)));

        signals [w->signum - 1].loop = EV_A;
#endif

        EV_FREQUENT_CHECK;

#if EV_USE_SIGNALFD

        if (sigfd == -2) {
            sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);

            if (sigfd < 0 && errno == EINVAL)
                sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */

            if (sigfd >= 0) {
                fd_intern (sigfd); /* doing it twice will not hurt */

                sigemptyset (&sigfd_set);

                ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
                ev_set_priority (&sigfd_w, EV_MAXPRI);
                ev_io_start (EV_A_ & sigfd_w);
                ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
            }
        }

        if (sigfd >= 0) {
            /* TODO: check .head */
            sigaddset (&sigfd_set, w->signum);
            sigprocmask (SIG_BLOCK, &sigfd_set, 0);

            signalfd (sigfd, &sigfd_set, 0);
        }

#endif

        ev_start (EV_A_ (W)w, 1);
        wlist_add (&signals [w->signum - 1].head, (WL)w);

        if (!((WL)w)->next)
# if EV_USE_SIGNALFD
            if (sigfd < 0) /*TODO*/
# endif
            {
# ifdef _WIN32
                evpipe_init (EV_A);

                signal (w->signum, ev_sighandler);
# else
                struct sigaction        sa;

                evpipe_init (EV_A);

                sa.sa_handler = ev_sighandler;
                sigfillset (&sa.sa_mask);
                sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
                sigaction (w->signum, &sa, 0);

                sigemptyset (&sa.sa_mask);
                sigaddset (&sa.sa_mask, w->signum);
                sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
#endif
            }

        EV_FREQUENT_CHECK;
    }

    void noinline
    ev_signal_stop (EV_P_ ev_signal *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        wlist_del (&signals [w->signum - 1].head, (WL)w);
        ev_stop (EV_A_ (W)w);

        if (!signals [w->signum - 1].head) {
#if EV_MULTIPLICITY
            signals [w->signum - 1].loop = 0; /* unattach from signal */
#endif
#if EV_USE_SIGNALFD

            if (sigfd >= 0) {
                sigset_t                ss;

                sigemptyset (&ss);
                sigaddset (&ss, w->signum);
                sigdelset (&sigfd_set, w->signum);

                signalfd (sigfd, &sigfd_set, 0);
                sigprocmask (SIG_UNBLOCK, &ss, 0);
            } else
#endif
                signal (w->signum, SIG_DFL);
        }

        EV_FREQUENT_CHECK;
    }

#endif

#if EV_CHILD_ENABLE

    void
    ev_child_start (EV_P_ ev_child *w)
    {
#if EV_MULTIPLICITY
        assert (("libev: child watchers are only supported in the default loop" && (loop == easy_default_loop_ptr)));
#endif

        if (expect_false (ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, 1);
        wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);

        EV_FREQUENT_CHECK;
    }

    void
    ev_child_stop (EV_P_ ev_child *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }

#endif

#if EV_STAT_ENABLE

#ifdef _WIN32
#  undef lstat
#  define lstat(a,b) _stati64 (a,b)
#endif

#define DEF_STAT_INTERVAL  5.0074891
#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
#define MIN_STAT_INTERVAL  0.1074891

    static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);

#if EV_USE_INOTIFY

    /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
#define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)

    static void noinline
    infy_add (EV_P_ ev_stat *w)
    {
        w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);

        if (w->wd >= 0) {
            struct statfs           sfs;

            /* now local changes will be tracked by inotify, but remote changes won't */
            /* unless the filesystem is known to be local, we therefore still poll */
            /* also do poll on <2.6.25, but with normal frequency */

            if (!fs_2625)
                w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
            else if (!statfs (w->path, &sfs)
                     && (sfs.f_type == 0x1373 /* devfs */
                         || sfs.f_type == 0xEF53 /* ext2/3 */
                         || sfs.f_type == 0x3153464a /* jfs */
                         || sfs.f_type == 0x52654973 /* reiser3 */
                         || sfs.f_type == 0x01021994 /* tempfs */
                         || sfs.f_type == 0x58465342 /* xfs */))
                w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
            else
                w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
        } else {
            /* can't use inotify, continue to stat */
            w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;

            /* if path is not there, monitor some parent directory for speedup hints */
            /* note that exceeding the hardcoded path limit is not a correctness issue, */
            /* but an efficiency issue only */
            if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096) {
                char                    path [4096];
                strcpy (path, w->path);

                do {
                    int                     mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
                                                   | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);

                    char                    *pend = strrchr (path, '/');

                    if (!pend || pend == path)
                        break;

                    *pend = 0;
                    w->wd = inotify_add_watch (fs_fd, path, mask);
                } while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
            }
        }

        if (w->wd >= 0)
            wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);

        /* now re-arm timer, if required */
        if (ev_is_active (&w->timer)) ev_ref (EV_A);

        ev_timer_again (EV_A_ & w->timer);

        if (ev_is_active (&w->timer)) ev_unref (EV_A);
    }

    static void noinline
    infy_del (EV_P_ ev_stat *w)
    {
        int                     slot;
        int                     wd = w->wd;

        if (wd < 0)
            return;

        w->wd = -2;
        slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
        wlist_del (&fs_hash [slot].head, (WL)w);

        /* remove this watcher, if others are watching it, they will rearm */
        inotify_rm_watch (fs_fd, wd);
    }

    static void noinline
    infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
    {
        if (slot < 0)

            /* overflow, need to check for all hash slots */
            for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
                infy_wd (EV_A_ slot, wd, ev);
        else {
            WL                      w_;

            for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; ) {
                ev_stat                 *w = (ev_stat *)w_;
                w_ = w_->next; /* lets us remove this watcher and all before it */

                if (w->wd == wd || wd == -1) {
                    if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF)) {
                        wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
                        w->wd = -1;
                        infy_add (EV_A_ w); /* re-add, no matter what */
                    }

                    stat_timer_cb (EV_A_ & w->timer, 0);
                }
            }
        }
    }

    static void
    infy_cb (EV_P_ ev_io *w, int revents)
    {
        char                    buf [EV_INOTIFY_BUFSIZE];
        int                     ofs;
        int                     len = read (fs_fd, buf, sizeof (buf));

        for (ofs = 0; ofs < len; ) {
            struct inotify_event    *ev = (struct inotify_event *)(buf + ofs);
            infy_wd (EV_A_ ev->wd, ev->wd, ev);
            ofs += sizeof (struct inotify_event) + ev->len;
        }
    }

    inline_size void
    ev_check_2625 (EV_P)
    {
        /* kernels < 2.6.25 are borked
         * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
         */
        if (ev_linux_version () < 0x020619)
            return;

        fs_2625 = 1;
    }

    inline_size int
    infy_newfd (void)
    {
#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
        int                     fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);

        if (fd >= 0)
            return fd;

#endif
        return inotify_init ();
    }

    inline_size void
    infy_init (EV_P)
    {
        if (fs_fd != -2)
            return;

        fs_fd = -1;

        ev_check_2625 (EV_A);

        fs_fd = infy_newfd ();

        if (fs_fd >= 0) {
            fd_intern (fs_fd);
            ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
            ev_set_priority (&fs_w, EV_MAXPRI);
            ev_io_start (EV_A_ & fs_w);
            ev_unref (EV_A);
        }
    }

    inline_size void
    infy_fork (EV_P)
    {
        int                     slot;

        if (fs_fd < 0)
            return;

        ev_ref (EV_A);
        ev_io_stop (EV_A_ & fs_w);
        close (fs_fd);
        fs_fd = infy_newfd ();

        if (fs_fd >= 0) {
            fd_intern (fs_fd);
            ev_io_set (&fs_w, fs_fd, EV_READ);
            ev_io_start (EV_A_ & fs_w);
            ev_unref (EV_A);
        }

        for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot) {
            WL                      w_ = fs_hash [slot].head;
            fs_hash [slot].head = 0;

            while (w_) {
                ev_stat                 *w = (ev_stat *)w_;
                w_ = w_->next; /* lets us add this watcher */

                w->wd = -1;

                if (fs_fd >= 0)
                    infy_add (EV_A_ w); /* re-add, no matter what */
                else {
                    w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;

                    if (ev_is_active (&w->timer)) ev_ref (EV_A);

                    ev_timer_again (EV_A_ & w->timer);

                    if (ev_is_active (&w->timer)) ev_unref (EV_A);
                }
            }
        }
    }

#endif

#ifdef _WIN32
# define EV_LSTAT(p,b) _stati64 (p, b)
#else
# define EV_LSTAT(p,b) lstat (p, b)
#endif

    void
    ev_stat_stat (EV_P_ ev_stat *w)
    {
        if (lstat (w->path, &w->attr) < 0)
            w->attr.st_nlink = 0;
        else if (!w->attr.st_nlink)
            w->attr.st_nlink = 1;
    }

    static void noinline
    stat_timer_cb (EV_P_ ev_timer *w_, int revents)
    {
        ev_stat                 *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));

        ev_statdata             prev = w->attr;
        ev_stat_stat (EV_A_ w);

        /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
        if (
            prev.st_dev      != w->attr.st_dev
            || prev.st_ino   != w->attr.st_ino
            || prev.st_mode  != w->attr.st_mode
            || prev.st_nlink != w->attr.st_nlink
            || prev.st_uid   != w->attr.st_uid
            || prev.st_gid   != w->attr.st_gid
            || prev.st_rdev  != w->attr.st_rdev
            || prev.st_size  != w->attr.st_size
            || prev.st_atime != w->attr.st_atime
            || prev.st_mtime != w->attr.st_mtime
            || prev.st_ctime != w->attr.st_ctime
        ) {
            /* we only update w->prev on actual differences */
            /* in case we test more often than invoke the callback, */
            /* to ensure that prev is always different to attr */
            w->prev = prev;

#if EV_USE_INOTIFY

            if (fs_fd >= 0) {
                infy_del (EV_A_ w);
                infy_add (EV_A_ w);
                ev_stat_stat (EV_A_ w); /* avoid race... */
            }

#endif

            ev_feed_event (EV_A_ w, EV_STAT);
        }
    }

    void
    ev_stat_start (EV_P_ ev_stat *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        ev_stat_stat (EV_A_ w);

        if (w->interval < MIN_STAT_INTERVAL && w->interval)
            w->interval = MIN_STAT_INTERVAL;

        ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
        ev_set_priority (&w->timer, ev_priority (w));

#if EV_USE_INOTIFY
        infy_init (EV_A);

        if (fs_fd >= 0)
            infy_add (EV_A_ w);
        else
#endif
        {
            ev_timer_again (EV_A_ & w->timer);
            ev_unref (EV_A);
        }

        ev_start (EV_A_ (W)w, 1);

        EV_FREQUENT_CHECK;
    }

    void
    ev_stat_stop (EV_P_ ev_stat *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

#if EV_USE_INOTIFY
        infy_del (EV_A_ w);
#endif

        if (ev_is_active (&w->timer)) {
            ev_ref (EV_A);
            ev_timer_stop (EV_A_ & w->timer);
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_IDLE_ENABLE
    void
    ev_idle_start (EV_P_ ev_idle *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        pri_adjust (EV_A_ (W)w);

        EV_FREQUENT_CHECK;

        {
            int                     active = ++idlecnt [ABSPRI (w)];

            ++idleall;
            ev_start (EV_A_ (W)w, active);

            array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
            idles [ABSPRI (w)][active - 1] = w;
        }

        EV_FREQUENT_CHECK;
    }

    void
    ev_idle_stop (EV_P_ ev_idle *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
            ev_active (idles [ABSPRI (w)][active - 1]) = active;

            ev_stop (EV_A_ (W)w);
            --idleall;
        }

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_PREPARE_ENABLE
    void
    ev_prepare_start (EV_P_ ev_prepare *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, ++preparecnt);
        array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
        prepares [preparecnt - 1] = w;

        EV_FREQUENT_CHECK;
    }

    void
    ev_prepare_stop (EV_P_ ev_prepare *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            prepares [active - 1] = prepares [--preparecnt];
            ev_active (prepares [active - 1]) = active;
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_CHECK_ENABLE
    void
    ev_check_start (EV_P_ ev_check *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, ++checkcnt);
        array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
        checks [checkcnt - 1] = w;

        EV_FREQUENT_CHECK;
    }

    void
    ev_check_stop (EV_P_ ev_check *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            checks [active - 1] = checks [--checkcnt];
            ev_active (checks [active - 1]) = active;
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_EMBED_ENABLE
    void noinline
    ev_embed_sweep (EV_P_ ev_embed *w)
    {
        ev_run (w->other, EVRUN_NOWAIT);
    }

    static void
    embed_io_cb (EV_P_ ev_io *io, int revents)
    {
        ev_embed                *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));

        if (ev_cb (w))
            ev_feed_event (EV_A_ (W)w, EV_EMBED);
        else
            ev_run (w->other, EVRUN_NOWAIT);
    }

    static void
    embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
    {
        ev_embed                *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));

        {
            EV_P = w->other;

            while (fdchangecnt) {
                fd_reify (EV_A);
                ev_run (EV_A_ EVRUN_NOWAIT);
            }
        }
    }

    static void
    embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
    {
        ev_embed                *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));

        ev_embed_stop (EV_A_ w);

        {
            EV_P = w->other;

            ev_loop_fork (EV_A);
            ev_run (EV_A_ EVRUN_NOWAIT);
        }

        ev_embed_start (EV_A_ w);
    }

#if 0
    static void
    embed_idle_cb (EV_P_ ev_idle *idle, int revents)
    {
        ev_idle_stop (EV_A_ idle);
    }
#endif

    void
    ev_embed_start (EV_P_ ev_embed *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        {
            EV_P = w->other;
            assert (("libev: loop to be embedded is not embeddable" && (backend & ev_embeddable_backends ())));
            ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
        }

        EV_FREQUENT_CHECK;

        ev_set_priority (&w->io, ev_priority (w));
        ev_io_start (EV_A_ & w->io);

        ev_prepare_init (&w->prepare, embed_prepare_cb);
        ev_set_priority (&w->prepare, EV_MINPRI);
        ev_prepare_start (EV_A_ & w->prepare);

        ev_fork_init (&w->fork, embed_fork_cb);
        ev_fork_start (EV_A_ & w->fork);

        /*ev_idle_init (&w->idle, e,bed_idle_cb);*/

        ev_start (EV_A_ (W)w, 1);

        EV_FREQUENT_CHECK;
    }

    void
    ev_embed_stop (EV_P_ ev_embed *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_io_stop      (EV_A_ & w->io);
        ev_prepare_stop (EV_A_ & w->prepare);
        ev_fork_stop    (EV_A_ & w->fork);

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_FORK_ENABLE
    void
    ev_fork_start (EV_P_ ev_fork *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, ++forkcnt);
        array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
        forks [forkcnt - 1] = w;

        EV_FREQUENT_CHECK;
    }

    void
    ev_fork_stop (EV_P_ ev_fork *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            forks [active - 1] = forks [--forkcnt];
            ev_active (forks [active - 1]) = active;
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_CLEANUP_ENABLE
    void
    ev_cleanup_start (EV_P_ ev_cleanup *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, ++cleanupcnt);
        array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
        cleanups [cleanupcnt - 1] = w;

        /* cleanup watchers should never keep a refcount on the loop */
        ev_unref (EV_A);
        EV_FREQUENT_CHECK;
    }

    void
    ev_cleanup_stop (EV_P_ ev_cleanup *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;
        ev_ref (EV_A);

        {
            int                     active = ev_active (w);

            cleanups [active - 1] = cleanups [--cleanupcnt];
            ev_active (cleanups [active - 1]) = active;
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }
#endif

#if EV_ASYNC_ENABLE
    void
    ev_async_start (EV_P_ ev_async *w)
    {
        if (expect_false (ev_is_active (w)))
            return;

        w->sent = 0;

        evpipe_init (EV_A);

        EV_FREQUENT_CHECK;

        ev_start (EV_A_ (W)w, ++asynccnt);
        array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
        asyncs [asynccnt - 1] = w;

        EV_FREQUENT_CHECK;
    }

    void
    ev_async_stop (EV_P_ ev_async *w)
    {
        clear_pending (EV_A_ (W)w);

        if (expect_false (!ev_is_active (w)))
            return;

        EV_FREQUENT_CHECK;

        {
            int                     active = ev_active (w);

            asyncs [active - 1] = asyncs [--asynccnt];
            ev_active (asyncs [active - 1]) = active;
        }

        ev_stop (EV_A_ (W)w);

        EV_FREQUENT_CHECK;
    }

    void
    ev_async_send (EV_P_ ev_async *w)
    {
        w->sent = 1;
        ev_mb();
        evpipe_write (EV_A_ & async_pending);
    }

    void
    ev_async_fsend (EV_P_ ev_async *w)
    {
        w->sent = 1;
        async_pending = 0;
        evpipe_write (EV_A_ & async_pending);
    }
#endif

    /*****************************************************************************/

    struct ev_once {
        ev_io                   io;
        ev_timer                to;
        void ( *cb)(int revents, void *arg);
        void                    *arg;
    };

    static void
    once_cb (EV_P_ struct ev_once *once, int revents)
    {
        void (*cb)(int revents, void *arg) = once->cb;
        void                    *arg = once->arg;

        ev_io_stop    (EV_A_ & once->io);
        ev_timer_stop (EV_A_ & once->to);
        ev_free (once);

        cb (revents, arg);
    }

    static void
    once_cb_io (EV_P_ ev_io *w, int revents)
    {
        struct ev_once          *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));

        once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ & once->to));
    }

    static void
    once_cb_to (EV_P_ ev_timer *w, int revents)
    {
        struct ev_once          *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));

        once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ & once->io));
    }

    void
    ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
    {
        struct ev_once          *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));

        if (expect_false (!once)) {
            cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
            return;
        }

        once->cb  = cb;
        once->arg = arg;

        ev_init (&once->io, once_cb_io);

        if (fd >= 0) {
            ev_io_set (&once->io, fd, events);
            ev_io_start (EV_A_ & once->io);
        }

        ev_init (&once->to, once_cb_to);

        if (timeout >= 0.) {
            ev_timer_set (&once->to, timeout, 0.);
            ev_timer_start (EV_A_ & once->to);
        }
    }

    /*****************************************************************************/

#if EV_WALK_ENABLE
    void
    ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
    {
        int                     i, j;
        ev_watcher_list         *wl, *wn;

        if (types & (EV_IO | EV_EMBED))
            for (i = 0; i < anfdmax; ++i)
                for (wl = anfds [i].head; wl; ) {
                    wn = wl->next;

#if EV_EMBED_ENABLE

                    if (ev_cb ((ev_io *)wl) == embed_io_cb) {
                        if (types & EV_EMBED)
                            cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
                    } else
#endif
#if EV_USE_INOTIFY
                        if (ev_cb ((ev_io *)wl) == infy_cb)
                            ;
                        else
#endif
                            if ((ev_io *)wl != &pipe_w)
                                if (types & EV_IO)
                                    cb (EV_A_ EV_IO, wl);

                    wl = wn;
                }

        if (types & (EV_TIMER | EV_STAT))
            for (i = timercnt + HEAP0; i-- > HEAP0; )
#if EV_STAT_ENABLE

                /*TODO: timer is not always active*/
                if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb) {
                    if (types & EV_STAT)
                        cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
                } else
#endif
                    if (types & EV_TIMER)
                        cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));

#if EV_PERIODIC_ENABLE

        if (types & EV_PERIODIC)
            for (i = periodiccnt + HEAP0; i-- > HEAP0; )
                cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));

#endif

#if EV_IDLE_ENABLE

        if (types & EV_IDLE)
            for (j = NUMPRI; i--; )
                for (i = idlecnt [j]; i--; )
                    cb (EV_A_ EV_IDLE, idles [j][i]);

#endif

#if EV_FORK_ENABLE

        if (types & EV_FORK)
            for (i = forkcnt; i--; )
                if (ev_cb (forks [i]) != embed_fork_cb)
                    cb (EV_A_ EV_FORK, forks [i]);

#endif

#if EV_ASYNC_ENABLE

        if (types & EV_ASYNC)
            for (i = asynccnt; i--; )
                cb (EV_A_ EV_ASYNC, asyncs [i]);

#endif

#if EV_PREPARE_ENABLE

        if (types & EV_PREPARE)
            for (i = preparecnt; i--; )
# if EV_EMBED_ENABLE
                if (ev_cb (prepares [i]) != embed_prepare_cb)
# endif
                    cb (EV_A_ EV_PREPARE, prepares [i]);

#endif

#if EV_CHECK_ENABLE

        if (types & EV_CHECK)
            for (i = checkcnt; i--; )
                cb (EV_A_ EV_CHECK, checks [i]);

#endif

#if EV_SIGNAL_ENABLE

        if (types & EV_SIGNAL)
            for (i = 0; i < EV_NSIG - 1; ++i)
                for (wl = signals [i].head; wl; ) {
                    wn = wl->next;
                    cb (EV_A_ EV_SIGNAL, wl);
                    wl = wn;
                }

#endif

#if EV_CHILD_ENABLE

        if (types & EV_CHILD)
            for (i = (EV_PID_HASHSIZE); i--; )
                for (wl = childs [i]; wl; ) {
                    wn = wl->next;
                    cb (EV_A_ EV_CHILD, wl);
                    wl = wn;
                }

#endif
        ///* EV_STAT     0x00001000 /* stat data changed */
        ///* EV_EMBED    0x00010000 /* embedded event loop needs sweep */
    }
#endif

#if EV_MULTIPLICITY
#include "ev_wrap.h"
#endif

    EV_CPP(
})
