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c73e1869
编写于
5月 04, 1998
作者:
M
Marc G. Fournier
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电子邮件补丁
差异文件
Okay...this should fix the s_lock() patches from David to what he
currently has... From: David Gould <dg@illustra.com>
上级
1d36bdcf
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
79 addition
and
285 deletion
+79
-285
src/backend/storage/buffer/Makefile
src/backend/storage/buffer/Makefile
+1
-1
src/backend/storage/buffer/s_lock.c
src/backend/storage/buffer/s_lock.c
+1
-1
src/include/storage/s_lock.h
src/include/storage/s_lock.h
+77
-283
未找到文件。
src/backend/storage/buffer/Makefile
浏览文件 @
c73e1869
...
...
@@ -4,7 +4,7 @@
# Makefile for storage/buffer
#
# IDENTIFICATION
# $Header: /cvsroot/pgsql/src/backend/storage/buffer/Makefile,v 1.
9 1998/05/04 15:44:39
scrappy Exp $
# $Header: /cvsroot/pgsql/src/backend/storage/buffer/Makefile,v 1.
10 1998/05/04 16:58:37
scrappy Exp $
#
#-------------------------------------------------------------------------
...
...
src/backend/storage/buffer/s_lock.c
浏览文件 @
c73e1869
...
...
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.
5 1998/05/04 15:44:41
scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.
6 1998/05/04 16:58:38
scrappy Exp $
*
*-------------------------------------------------------------------------
*/
...
...
src/include/storage/s_lock.h
浏览文件 @
c73e1869
...
...
@@ -7,39 +7,39 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.3
1 1998/05/04 02:02:06 momjian
Exp $
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.3
2 1998/05/04 16:58:59 scrappy
Exp $
*
*-------------------------------------------------------------------------
*/
/*
* DESCRIPTION
*
The public functions that must be provided are:
*
The public functions that must be provided are:
*
*
void S_INIT_LOCK(slock_t *lock)
*
void S_INIT_LOCK(slock_t *lock)
*
* void S_LOCK(slock_t *lock)
*
*
void S_UNLOCK(slock_t *lock)
*
void S_UNLOCK(slock_t *lock)
*
*
int S_LOCK_FREE(slock_t *lock)
*
Tests if the lock is free. Returns non-zero if free, 0 if locked.
*
void S_LOCK_FREE(slock_t *lock)
*
Tests if the lock is free. Returns non-zero if free, 0 if locked.
*
* The S_LOCK() function (in s_lock.c) implements a primitive but
* still useful random backoff to avoid hordes of busywaiting lockers
* chewing CPU.
* The S_LOCK() macro implements a primitive but still useful random
* backoff to avoid hordes of busywaiting lockers chewing CPU.
*
* Effectively:
* void
* S_LOCK(slock_t *lock)
* {
*
while (TAS(lock))
*
{
*
while (TAS(lock))
*
{
* // back off the cpu for a semi-random short time
*
}
*
}
* }
*
* This implementation takes advantage of a tas function written
*
(in assembly language) on machines that have a native test-and-set
*
instruction. Alternative mutex implementations may also be used.
* This implementation takes advantage of a tas function written
*
(in assembly language) on machines that have a native test-and-set
*
instruction. Alternative mutex implementations may also be used.
* This function is hidden under the TAS macro to allow substitutions.
*
* #define TAS(lock) tas(lock)
...
...
@@ -62,7 +62,7 @@
* override them.
*
*/
#if
ndef S_LOCK_H
#if
!defined(S_LOCK_H)
#define S_LOCK_H
#include "storage/ipc.h"
...
...
@@ -78,16 +78,15 @@
#define S_UNLOCK(lock) { __asm__("mb"); *(lock) = 0; }
#endif
/* defined(__alpha__) && defined(linux)
*/
#endif
/* __alpha__
*/
#else
/*
defined(linux)
*/
#else
/*
linux
*/
/***************************************************************************
* All non Linux
*/
#endif
#if defined (nextstep)
/*
...
...
@@ -104,7 +103,7 @@
/* For Mach, we have to delve inside the entrails of `struct mutex'. Ick! */
#define S_LOCK_FREE(alock) ((alock)->lock == 0)
#endif
/* nextstep */
#endif
/* nextstep */
...
...
@@ -118,37 +117,26 @@
* assembly from his NECEWS SVR4 port, but we probably ought to retain this
* for the R3000 chips out there.
*/
#define S_LOCK(lock) do \
{ \
while (!acquire_lock(lock)) \
; \
} while (0)
#define TAS(lock) (!acquire_lock(lock))
#define S_UNLOCK(lock) release_lock(lock)
#define S_INIT_LOCK(lock) init_lock(lock)
/* S_LOCK_FREE should return 1 if lock is free; 0 if lock is locked */
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
#endif
/* __sgi */
#endif
/* __sgi */
#if (defined(__alpha__)
/*
* OSF/1 (Alpha AXP)
*
* Note that slock_t on the Alpha AXP is msemaphore instead of char
* (see storage/ipc.h).
*/
#if defined(__alpha) && !defined(linux)
#define S_LOCK(lock) do \
{ \
while (msem_lock((lock), MSEM_IF_NOWAIT) < 0) \
; \
} while (0)
#define TAS(lock) (msem_lock((lock), MSEM_IF_NOWAIT) < 0)
#define S_UNLOCK(lock) msem_unlock((lock), 0)
...
...
@@ -156,303 +144,109 @@
#define S_LOCK_FREE(lock) (!(lock)->msem_state)
#endif
/* alpha */
/*
* Solaris 2
*/
#if (defined(__i386__) || defined(__sparc__)) && defined(__sun__)
/* for xxxxx_solaris, this is defined in port/.../tas.s */
#endif
/* __alpha__ */
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* i86pc_solaris || sparc_solaris */
#if defined(_AIX)
/*
* AIX (POWER)
*
* Note that slock_t on POWER/POWER2/PowerPC is int instead of char
* (see storage/ipc.h).
*/
#define TAS(lock) cs((int *) (lock), 0, 1)
#if defined(_AIX)
#define S_LOCK(lock) do \
{ \
while (cs((int *) (lock), 0, 1)) \
; \
} while (0)
#endif
/* _AIX */
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* _AIX */
#if defined(__hpux)
/*
* HP-UX (PA-RISC)
*
* Note that slock_t on PA-RISC is a structure instead of char
* (see storage/ipc.h).
*
* a "set" slock_t has a single word cleared. a "clear" slock_t has
* all words set to non-zero. tas() in tas.s
*/
#if defined(__hpux)
/*
* a "set" slock_t has a single word cleared. a "clear" slock_t has
* all words set to non-zero.
*/
static
slock_t
clear_lock
=
{
-
1
,
-
1
,
-
1
,
-
1
};
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
static
slock_t
clear_lock
=
{
-
1
,
-
1
,
-
1
,
-
1
};
#define S_UNLOCK(lock) (*(lock) = clear_lock)
/* struct assignment */
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#define S_LOCK_FREE(lock) ( *(int *) (((long) (lock) + 15) & ~15) != 0)
#endif
/* __hpux */
#endif
/* __hpux */
/*
* sun3
*/
#if defined(sun3)
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#endif
/* else defined(linux) */
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
static
int
tas_dummy
()
{
asm
(
"LLA0:"
);
asm
(
" .data"
);
asm
(
" .text"
);
asm
(
"|#PROC# 04"
);
asm
(
" .globl _tas"
);
asm
(
"_tas:"
);
asm
(
"|#PROLOGUE# 1"
);
asm
(
" movel sp@(0x4),a0"
);
asm
(
" tas a0@"
);
asm
(
" beq LLA1"
);
asm
(
" moveq #-128,d0"
);
asm
(
" rts"
);
asm
(
"LLA1:"
);
asm
(
" moveq #0,d0"
);
asm
(
" rts"
);
asm
(
" .data"
);
}
#endif
/* sun3 */
/*
* sparc machines
*/
#if defined(NEED_SPARC_TAS_ASM)
/* if we're using -ansi w/ gcc, use __asm__ instead of asm */
#if defined(__STRICT_ANSI__)
#define asm(x) __asm__(x)
#endif
static
int
tas
(
slock_t
*
lock
);
static
void
tas_dummy
()
{
asm
(
".seg
\"
data
\"
"
);
asm
(
".seg
\"
text
\"
"
);
asm
(
"_tas:"
);
/*
* Sparc atomic test and set (sparc calls it "atomic load-store")
*/
asm
(
"ldstub [%r8], %r8"
);
/*
* Did test and set actually do the set?
*/
asm
(
"tst %r8"
);
asm
(
"be,a ReturnZero"
);
/*
* otherwise, just return.
*/
asm
(
"clr %r8"
);
asm
(
"mov 0x1, %r8"
);
asm
(
"ReturnZero:"
);
asm
(
"retl"
);
asm
(
"nop"
);
}
#define S_LOCK(addr) do \
{ \
while (tas(addr)) \
; \
} while (0)
/*
* addr should be as in the above S_LOCK routine
/****************************************************************************
* Default Definitions - override these above as needed.
*/
#define S_UNLOCK(addr) (*(addr) = 0)
#
define S_INIT_LOCK(addr) (*(addr) = 0
)
#
if !defined(S_LOCK
)
#
endif
/* NEED_SPARC_TAS_ASM */
#
include <sys/time.h>
/*
* VAXen -- even multiprocessor ones
*/
#define S_NSPINCYCLE 16
#define S_MAX_BUSY 1000 * S_NSPINCYCLE
#if defined(NEED_VAX_TAS_ASM)
extern
int
s_spincycle
[];
extern
void
s_lock_stuck
(
slock_t
*
lock
,
char
*
file
,
int
line
);
#define S_LOCK(addr) __asm__("1: bbssi $0,(%0),1b": :"r"(addr))
#define S_UNLOCK(addr) (*(addr) = 0)
#define S_INIT_LOCK(addr) (*(addr) = 0)
#if defined(S_LOCK_DEBUG)
#endif
/* NEED_VAX_TAS_ASM */
extern
void
s_lock
(
slock_t
*
lock
);
/*
* i386 based things
*/
#define S_LOCK(lock) s_lock(lock, __FILE__, __LINE__)
#if defined(NEED_I386_TAS_ASM)
#if defined(USE_UNIVEL_CC)
asm
void
S_LOCK
(
char
*
lval
)
{
%
lab
again
;
/* Upon entry, %eax will contain the pointer to the lock byte */
pushl
%
ebx
xchgl
%
eax
,
%
ebx
movb
$
255
,
%
al
again:
lock
xchgb
%
al
,
(
%
ebx
)
cmpb
$
0
,
%
al
jne
again
popl
%
ebx
}
#else
#define S_LOCK(lock) do \
{ \
slock_t _res; \
do \
{ \
__asm__("lock; xchgb %0,%1": "=q"(_res), "=m"(*lock):"0"(0x1)); \
} while (_res != 0); \
} while (0)
#endif
#define S_UNLOCK(lock) (*(lock) = 0)
#else
/* S_LOCK_DEBUG */
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#define S_LOCK(lock) if (1) { \
int spins = 0; \
while (TAS(lock)) { \
struct timeval delay; \
delay.tv_sec = 0; \
delay.tv_usec = s_spincycle[spins++ % S_NSPINCYCLE]; \
(void) select(0, NULL, NULL, NULL, &delay); \
if (spins > S_MAX_BUSY) { \
/* It's been well over a minute... */
\
s_lock_stuck(lock, __FILE__, __LINE__); \
} \
} \
} else
#endif
/* NEED_I386_TAS_ASM */
#endif
/* S_LOCK_DEBUG */
#endif
/* S_LOCK */
#if defined(__alpha) && defined(linux)
void
S_LOCK
(
slock_t
*
lock
);
#if !defined(S_LOCK_FREE)
#define S_LOCK_FREE(lock) ((*lock) == 0)
#endif
/* S_LOCK_FREE */
#define S_UNLOCK(lock) { __asm__("mb"); *(lock) = 0; }
#if !defined(S_UNLOCK)
#define S_UNLOCK(lock) (*(lock) = 0)
#endif
/* S_UNLOCK */
#if !defined(S_INIT_LOCK)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* S_INIT_LOCK */
#endif
/* defined(__alpha) && defined(linux) */
#if defined(linux) && defined(sparc)
#define S_LOCK(lock) do \
{ \
slock_t _res; \
slock_t *tmplock = lock ; \
do \
{ \
__asm__("ldstub [%1], %0" \
: "=&r"(_res), "=r"(tmplock) \
: "1"(tmplock)); \
} while (_res != 0); \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* defined(linux) && defined(sparc) */
#if defined(linux) && defined(PPC)
static
int
tas_dummy
()
{
__asm__
(
"
\n
\
tas:
\n
\
lwarx 5,0,3
\n
\
cmpwi 5,0
\n
\
bne fail
\n
\
addi 5,5,1
\n
\
stwcx. 5,0,3
\n
\
beq success
\n
\
fail: li 3,1
\n
\
blr
\n
\
success:
\n
\
li 3,0
\n
\
blr
\n
\
"
);
}
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#if !defined(TAS)
int
tas
(
slock_t
*
lock
);
/* port/.../tas.s, or s_lock.c */
#endif
/* defined(linux) && defined(PPC) */
#define TAS(lock) tas(lock)
#endif
/* TAS */
#ifndef S_LOCK_FREE
/* for those who have not already defined
* it */
#define S_LOCK_FREE(lock) ((*lock) == 0)
#endif
#endif
/* HAS_TEST_AND_SET */
#endif
/* HAS_TEST_AND_SET */
#endif
/* S_LOCK_H */
#endif
/* S_LOCK_H */
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