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Overview
| Comment: | Provide the ability to specify an alternative mutex subsystem at compile-time. - This check-in should have gone on the trunk, not on the 3.7.6 branch. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | mistake |
| Files: | files | file ages | folders |
| SHA1: |
489c453d4ebb0358c4d7b8dedce5187b |
| User & Date: | drh 2011-05-10 14:52:06 |
| Original Comment: | Provide the ability to specify an alternative mutex subsystem at compile-time. |
Context
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2011-05-10
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| 14:52 | Provide the ability to specify an alternative mutex subsystem at compile-time. - This check-in should have gone on the trunk, not on the 3.7.6 branch. (Closed-Leaf check-in: 489c453d user: drh tags: mistake) | |
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2011-04-17
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| 17:25 | Version 3.7.6.2 (check-in: 154ddbc1 user: drh tags: release, version-3.7.6.2, branch-3.7.6) | |
Changes
Changes to src/mutex.c.
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** For debugging purposes, record when the mutex subsystem is initialized
** and uninitialized so that we can assert() if there is an attempt to
** allocate a mutex while the system is uninitialized.
*/
static SQLITE_WSD int mutexIsInit = 0;
#endif /* SQLITE_DEBUG */
#ifndef SQLITE_MUTEX_OMIT
/*
** Initialize the mutex system.
*/
int sqlite3MutexInit(void){
int rc = SQLITE_OK;
................................................................................
** sqlite3_initialize() being called. This block copies pointers to
** the default implementation into the sqlite3GlobalConfig structure.
*/
sqlite3_mutex_methods const *pFrom;
sqlite3_mutex_methods *pTo = &sqlite3GlobalConfig.mutex;
if( sqlite3GlobalConfig.bCoreMutex ){
pFrom = sqlite3DefaultMutex();
}else{
pFrom = sqlite3NoopMutex();
}
memcpy(pTo, pFrom, offsetof(sqlite3_mutex_methods, xMutexAlloc));
memcpy(&pTo->xMutexFree, &pFrom->xMutexFree,
sizeof(*pTo) - offsetof(sqlite3_mutex_methods, xMutexFree));
pTo->xMutexAlloc = pFrom->xMutexAlloc;
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** For debugging purposes, record when the mutex subsystem is initialized ** and uninitialized so that we can assert() if there is an attempt to ** allocate a mutex while the system is uninitialized. */ static SQLITE_WSD int mutexIsInit = 0; #endif /* SQLITE_DEBUG */ /* ** Implementations can specify an alternative routine for initializing ** the mutex using the SQLITE_MUTEX_DEFAULT macro. This macro should ** resolve to an expression that returns a pointer to an ** sqlite3_mutex_methods object that implements the default mutex. ** This is an undocumented feature and may not be supported in future ** releases. */ #if !defined(SQLITE_MUTEX_DEFAULT) # define SQLITE_MUTEX_DEFAULT sqlite3DefaultMutex() #endif #ifndef SQLITE_MUTEX_OMIT /* ** Initialize the mutex system. */ int sqlite3MutexInit(void){ int rc = SQLITE_OK; ................................................................................ ** sqlite3_initialize() being called. This block copies pointers to ** the default implementation into the sqlite3GlobalConfig structure. */ sqlite3_mutex_methods const *pFrom; sqlite3_mutex_methods *pTo = &sqlite3GlobalConfig.mutex; if( sqlite3GlobalConfig.bCoreMutex ){ pFrom = SQLITE_MUTEX_DEFAULT; }else{ pFrom = sqlite3NoopMutex(); } memcpy(pTo, pFrom, offsetof(sqlite3_mutex_methods, xMutexAlloc)); memcpy(&pTo->xMutexFree, &pFrom->xMutexFree, sizeof(*pTo) - offsetof(sqlite3_mutex_methods, xMutexFree)); pTo->xMutexAlloc = pFrom->xMutexAlloc; |