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bb718508
编写于
11月 15, 2013
作者:
xpxyr
提交者:
geniusgogo
11月 30, 2013
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add rtt mutex support
上级
e0a3ced7
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2
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2 changed file
with
349 addition
and
2 deletion
+349
-2
components/external/SQLite-3.8.1/src/mutex.h
components/external/SQLite-3.8.1/src/mutex.h
+6
-2
components/external/SQLite-3.8.1/src/mutex_rtt.c
components/external/SQLite-3.8.1/src/mutex_rtt.c
+343
-0
未找到文件。
components/external/SQLite-3.8.1/src/mutex.h
浏览文件 @
bb718508
...
...
@@ -33,6 +33,8 @@
** implementation can be overridden at
** start-time.
**
** SQLITE_MUTEX_RTT For multi_threaded applications on rt-thread.
**
** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix.
**
** SQLITE_MUTEX_W32 For multi-threaded applications on Win32.
...
...
@@ -45,6 +47,8 @@
# define SQLITE_MUTEX_PTHREADS
# elif SQLITE_OS_WIN
# define SQLITE_MUTEX_W32
# elif SQLITE_OS_RTT
# define SQLITE_MUTEX_RTT
# else
# define SQLITE_MUTEX_NOOP
# endif
...
...
@@ -56,9 +60,9 @@
*/
#define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8)
#define sqlite3_mutex_free(X)
#define sqlite3_mutex_enter(X)
#define sqlite3_mutex_enter(X)
#define sqlite3_mutex_try(X) SQLITE_OK
#define sqlite3_mutex_leave(X)
#define sqlite3_mutex_leave(X)
#define sqlite3_mutex_held(X) ((void)(X),1)
#define sqlite3_mutex_notheld(X) ((void)(X),1)
#define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8)
...
...
components/external/SQLite-3.8.1/src/mutex_rtt.c
0 → 100644
浏览文件 @
bb718508
/*
** 2007 August 28
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the C functions that implement mutexes for rtthread
*/
#include "sqliteInt.h"
/*
** The code in this file is only used if we are compiling threadsafe
** under rt-thread with rt_mutex.
**
** Note that this implementation requires a version of rt-thread that
** supports recursive mutexes.
*/
#ifdef SQLITE_MUTEX_RTT
#include <rtthread.h>
/*
** The sqlite3_mutex.id, sqlite3_mutex.nRef, and sqlite3_mutex.owner fields
** are necessary under two condidtions: (1) Debug builds and (2) using
** home-grown mutexes. Encapsulate these conditions into a single #define.
*/
#if defined(SQLITE_DEBUG) || defined(SQLITE_HOMEGROWN_RECURSIVE_MUTEX)
# define SQLITE_MUTEX_NREF 1
#else
# define SQLITE_MUTEX_NREF 0
#endif
/*
** Each recursive mutex is an instance of the following structure.
*/
struct
sqlite3_mutex
{
struct
rt_mutex
mutex
;
/* Mutex controlling the lock */
#if SQLITE_MUTEX_NREF
int
id
;
/* Mutex type */
volatile
int
nRef
;
/* Number of entrances */
volatile
rt_thread_t
owner
;
/* Thread that is within this mutex */
int
trace
;
/* True to trace changes */
#endif
};
#define RTT_MUTEX_INITIALIZER { 0 }
#if SQLITE_MUTEX_NREF
#define SQLITE3_MUTEX_INITIALIZER { RTT_MUTEX_INITIALIZER, 0, 0, (rt_thread_t)0, 0 }
#else
#define SQLITE3_MUTEX_INITIALIZER { RTT_MUTEX_INITIALIZER }
#endif
/*
** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
** intended for use only inside assert() statements. On some platforms,
** there might be race conditions that can cause these routines to
** deliver incorrect results. In particular, if rtt_equal() is
** not an atomic operation, then these routines might delivery
** incorrect results. On most platforms, rtt_equal() is a
** comparison of two integers and is therefore atomic. But we are
** told that HPUX is not such a platform. If so, then these routines
** will not always work correctly on HPUX.
**
** On those platforms where rtt_equal() is not atomic, SQLite
** should be compiled without -DSQLITE_DEBUG and with -DNDEBUG to
** make sure no assert() statements are evaluated and hence these
** routines are never called.
*/
#if !defined(NDEBUG) || defined(SQLITE_DEBUG)
static
int
rttMutexHeld
(
sqlite3_mutex
*
p
){
return
(
p
->
nRef
!=
0
&&
p
->
owner
==
rt_thread_self
());
}
static
int
rttMutexNotheld
(
sqlite3_mutex
*
p
){
return
(
p
->
nRef
==
0
||
p
->
owner
!=
rt_thread_self
());
}
#endif
/*
** Initialize and deinitialize the mutex subsystem.
*/
static
int
rttMutexInit
(
void
){
return
SQLITE_OK
;
}
static
int
rttMutexEnd
(
void
){
return
SQLITE_OK
;
}
/*
** The sqlite3_mutex_alloc() routine allocates a new
** mutex and returns a pointer to it. If it returns NULL
** that means that a mutex could not be allocated. SQLite
** will unwind its stack and return an error. The argument
** to sqlite3_mutex_alloc() is one of these integer constants:
**
** <ul>
** <li> SQLITE_MUTEX_FAST
** <li> SQLITE_MUTEX_RECURSIVE
** <li> SQLITE_MUTEX_STATIC_MASTER
** <li> SQLITE_MUTEX_STATIC_MEM
** <li> SQLITE_MUTEX_STATIC_MEM2
** <li> SQLITE_MUTEX_STATIC_PRNG
** <li> SQLITE_MUTEX_STATIC_LRU
** <li> SQLITE_MUTEX_STATIC_PMEM
** </ul>
**
** The first two constants cause sqlite3_mutex_alloc() to create
** a new mutex. The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
** The mutex implementation does not need to make a distinction
** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
** not want to. But SQLite will only request a recursive mutex in
** cases where it really needs one. If a faster non-recursive mutex
** implementation is available on the host platform, the mutex subsystem
** might return such a mutex in response to SQLITE_MUTEX_FAST.
**
** The other allowed parameters to sqlite3_mutex_alloc() each return
** a pointer to a static preexisting mutex. Six static mutexes are
** used by the current version of SQLite. Future versions of SQLite
** may add additional static mutexes. Static mutexes are for internal
** use by SQLite only. Applications that use SQLite mutexes should
** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
** SQLITE_MUTEX_RECURSIVE.
**
** Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
** returns a different mutex on every call. But for the static
** mutex types, the same mutex is returned on every call that has
** the same type number.
*/
static
sqlite3_mutex
*
rttMutexAlloc
(
int
iType
){
static
sqlite3_mutex
staticMutexes
[]
=
{
SQLITE3_MUTEX_INITIALIZER
,
SQLITE3_MUTEX_INITIALIZER
,
SQLITE3_MUTEX_INITIALIZER
,
SQLITE3_MUTEX_INITIALIZER
,
SQLITE3_MUTEX_INITIALIZER
,
SQLITE3_MUTEX_INITIALIZER
};
sqlite3_mutex
*
p
;
switch
(
iType
){
case
SQLITE_MUTEX_RECURSIVE
:
{
p
=
sqlite3MallocZero
(
sizeof
(
*
p
)
);
if
(
p
){
/* Use a recursive mutex if it is available */
rt_mutex_init
(
&
p
->
mutex
,
"sqlmtx"
,
RT_IPC_FLAG_PRIO
);
#if SQLITE_MUTEX_NREF
p
->
id
=
iType
;
#endif
}
break
;
}
case
SQLITE_MUTEX_FAST
:
{
p
=
sqlite3MallocZero
(
sizeof
(
*
p
)
);
if
(
p
){
#if SQLITE_MUTEX_NREF
p
->
id
=
iType
;
#endif
rt_mutex_init
(
&
p
->
mutex
,
"sqlmtx"
,
RT_IPC_FLAG_PRIO
);
}
break
;
}
default:
{
assert
(
iType
-
2
>=
0
);
assert
(
iType
-
2
<
ArraySize
(
staticMutexes
)
);
p
=
&
staticMutexes
[
iType
-
2
];
#if SQLITE_MUTEX_NREF
p
->
id
=
iType
;
#endif
break
;
}
}
return
p
;
}
/*
** This routine deallocates a previously
** allocated mutex. SQLite is careful to deallocate every
** mutex that it allocates.
*/
static
void
rttMutexFree
(
sqlite3_mutex
*
p
){
assert
(
p
->
nRef
==
0
);
assert
(
p
->
id
==
SQLITE_MUTEX_FAST
||
p
->
id
==
SQLITE_MUTEX_RECURSIVE
);
rt_mutex_delete
(
&
p
->
mutex
);
sqlite3_free
(
p
);
}
/*
** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
** to enter a mutex. If another thread is already within the mutex,
** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
** SQLITE_BUSY. The sqlite3_mutex_try() interface returns SQLITE_OK
** upon successful entry. Mutexes created using SQLITE_MUTEX_RECURSIVE can
** be entered multiple times by the same thread. In such cases the,
** mutex must be exited an equal number of times before another thread
** can enter. If the same thread tries to enter any other kind of mutex
** more than once, the behavior is undefined.
*/
static
void
rttMutexEnter
(
sqlite3_mutex
*
p
){
assert
(
p
->
id
==
SQLITE_MUTEX_RECURSIVE
||
rttMutexNotheld
(
p
)
);
#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
/* If recursive mutexes are not available, then we have to grow
** our own. This implementation assumes that rtt_equal()
** is atomic - that it cannot be deceived into thinking self
** and p->owner are equal if p->owner changes between two values
** that are not equal to self while the comparison is taking place.
** This implementation also assumes a coherent cache - that
** separate processes cannot read different values from the same
** address at the same time. If either of these two conditions
** are not met, then the mutexes will fail and problems will result.
*/
{
rt_thread_t
self
=
rt_thread_self
();
if
(
p
->
nRef
>
0
&&
(
p
->
owner
==
self
)
){
p
->
nRef
++
;
}
else
{
rt_mutex_take
(
&
p
->
mutex
,
RT_WAITING_FOREVER
);
assert
(
p
->
nRef
==
0
);
p
->
owner
=
self
;
p
->
nRef
=
1
;
}
}
#else
/* Use the built-in recursive mutexes if they are available.
*/
rt_mutex_take
(
&
p
->
mutex
,
RT_WAITING_FOREVER
);
#if SQLITE_MUTEX_NREF
assert
(
p
->
nRef
>
0
||
p
->
owner
==
0
);
p
->
owner
=
rt_thread_self
();
p
->
nRef
++
;
#endif
#endif
#ifdef SQLITE_DEBUG
if
(
p
->
trace
){
rt_kprintf
(
"enter mutex %p (%d) with nRef=%d
\n
"
,
p
,
p
->
trace
,
p
->
nRef
);
}
#endif
}
static
int
rttMutexTry
(
sqlite3_mutex
*
p
){
int
rc
;
assert
(
p
->
id
==
SQLITE_MUTEX_RECURSIVE
||
rttMutexNotheld
(
p
)
);
#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
/* If recursive mutexes are not available, then we have to grow
** our own. This implementation assumes that rtt_equal()
** is atomic - that it cannot be deceived into thinking self
** and p->owner are equal if p->owner changes between two values
** that are not equal to self while the comparison is taking place.
** This implementation also assumes a coherent cache - that
** separate processes cannot read different values from the same
** address at the same time. If either of these two conditions
** are not met, then the mutexes will fail and problems will result.
*/
{
rt_thread_t
self
=
rt_thread_self
();
if
(
p
->
nRef
>
0
&&
(
p
->
owner
==
self
)
){
p
->
nRef
++
;
rc
=
SQLITE_OK
;
}
else
if
(
rt_mutex_take
(
&
p
->
mutex
,
RT_WAITING_NO
)
==
RT_EOK
){
assert
(
p
->
nRef
==
0
);
p
->
owner
=
self
;
p
->
nRef
=
1
;
rc
=
SQLITE_OK
;
}
else
{
rc
=
SQLITE_BUSY
;
}
}
#else
/* Use the built-in recursive mutexes if they are available.
*/
if
(
rt_mutex_take
(
&
p
->
mutex
,
RT_WAITING_NO
)
==
RT_EOK
){
#if SQLITE_MUTEX_NREF
p
->
owner
=
rt_thread_self
();
p
->
nRef
++
;
#endif
rc
=
SQLITE_OK
;
}
else
{
rc
=
SQLITE_BUSY
;
}
#endif
#ifdef SQLITE_DEBUG
if
(
rc
==
SQLITE_OK
&&
p
->
trace
){
rt_kprintf
(
"enter mutex %p (%d) with nRef=%d
\n
"
,
p
,
p
->
trace
,
p
->
nRef
);
}
#endif
return
rc
;
}
/*
** The sqlite3_mutex_leave() routine exits a mutex that was
** previously entered by the same thread. The behavior
** is undefined if the mutex is not currently entered or
** is not currently allocated. SQLite will never do either.
*/
static
void
rttMutexLeave
(
sqlite3_mutex
*
p
){
assert
(
rttMutexHeld
(
p
)
);
#if SQLITE_MUTEX_NREF
p
->
nRef
--
;
if
(
p
->
nRef
==
0
)
p
->
owner
=
0
;
#endif
assert
(
p
->
nRef
==
0
||
p
->
id
==
SQLITE_MUTEX_RECURSIVE
);
#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
if
(
p
->
nRef
==
0
){
rt_mutex_release
(
&
p
->
mutex
);
}
#else
rt_mutex_release
(
&
p
->
mutex
);
#endif
#ifdef SQLITE_DEBUG
if
(
p
->
trace
){
rt_kprintf
(
"leave mutex %p (%d) with nRef=%d
\n
"
,
p
,
p
->
trace
,
p
->
nRef
);
}
#endif
}
sqlite3_mutex_methods
const
*
sqlite3DefaultMutex
(
void
){
static
const
sqlite3_mutex_methods
sMutex
=
{
rttMutexInit
,
rttMutexEnd
,
rttMutexAlloc
,
rttMutexFree
,
rttMutexEnter
,
rttMutexTry
,
rttMutexLeave
,
#ifdef SQLITE_DEBUG
rttMutexHeld
,
rttMutexNotheld
#else
0
,
0
#endif
};
return
&
sMutex
;
}
#endif
/* SQLITE_MUTEX_RTT */
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