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Overview
| Comment: | Specifying an invalid mutex implementation (via SQLITE_CONFIG_MUTEX) should cause the default one to be used instead. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | mutexInitCmpSwap |
| Files: | files | file ages | folders |
| SHA1: |
1a97bc81ccfc88f2dd527dff16e9e395 |
| User & Date: | mistachkin 2015-09-12 04:19:51 |
Context
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2015-09-12
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| 04:22 | Fix comments. (check-in: de3fa51e user: mistachkin tags: mutexInitCmpSwap) | |
| 04:19 | Specifying an invalid mutex implementation (via SQLITE_CONFIG_MUTEX) should cause the default one to be used instead. (check-in: 1a97bc81 user: mistachkin tags: mutexInitCmpSwap) | |
| 03:40 | Clarify the new mutex implementation reset logic in sqlite3_shutdown(). (check-in: f9a03483 user: mistachkin tags: mutexInitCmpSwap) | |
Changes
Changes to src/mutex.c.
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** allocate a mutex while the system is uninitialized. */ static SQLITE_WSD int mutexIsInit = 0; #endif /* SQLITE_DEBUG && !defined(SQLITE_MUTEX_OMIT) */ #ifndef SQLITE_MUTEX_OMIT /* ** Copies a mutex implementation. Both arguments must point to valid ** memory. */ static void mutexCopy( sqlite3_mutex_methods *pTo, sqlite3_mutex_methods const *pFrom ................................................................................ /* ** Initialize the mutex system. */ int sqlite3MutexInit(void){ int rc; if( sqlite3CompareAndSwap((void * volatile *)&sqlite3GlobalConfig.pMutex, 0, &sqlite3GlobalConfig.mutex)==0 ){ /* If the xMutexAlloc method has not been set, then the user did not ** install a mutex implementation via sqlite3_config() prior to ** sqlite3_initialize() being called. This block copies pointers to ** the default implementation into the sqlite3GlobalConfig structure. */ sqlite3_mutex_methods const *pFrom; |
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** allocate a mutex while the system is uninitialized. */ static SQLITE_WSD int mutexIsInit = 0; #endif /* SQLITE_DEBUG && !defined(SQLITE_MUTEX_OMIT) */ #ifndef SQLITE_MUTEX_OMIT /* ** This structure is for use by sqlite3MutexInit() only. It represents an ** invalid mutex implementation (i.e. one where all the function pointers ** are null). */ static const sqlite3_mutex_methods mutexNullMethods = { 0, /* xMutexInit */ 0, /* xMutexEnd */ 0, /* xMutexAlloc */ 0, /* xMutexFree */ 0, /* xMutexEnter */ 0, /* xMutexTry */ 0, /* xMutexLeave */ 0, /* xMutexHeld */ 0 /* xMutexNotheld */ }; /* ** Returns non-zero if the currently configured mutex implemention is ** invalid (i.e. all of its function pointers are null). */ static int mutexIsInvalid(void){ return memcmp(&sqlite3GlobalConfig.mutex, &mutexNullMethods, sizeof(sqlite3_mutex_methods))==0; } /* ** Copies a mutex implementation. Both arguments must point to valid ** memory. */ static void mutexCopy( sqlite3_mutex_methods *pTo, sqlite3_mutex_methods const *pFrom ................................................................................ /* ** Initialize the mutex system. */ int sqlite3MutexInit(void){ int rc; if( sqlite3CompareAndSwap((void * volatile *)&sqlite3GlobalConfig.pMutex, 0, &sqlite3GlobalConfig.mutex)==0 || mutexIsInvalid() ){ /* If the xMutexAlloc method has not been set, then the user did not ** install a mutex implementation via sqlite3_config() prior to ** sqlite3_initialize() being called. This block copies pointers to ** the default implementation into the sqlite3GlobalConfig structure. */ sqlite3_mutex_methods const *pFrom; |