diff options
Diffstat (limited to 'chromium/third_party/sqlite/sqlite-src-3240000/src/mutex.c')
| -rw-r--r-- | chromium/third_party/sqlite/sqlite-src-3240000/src/mutex.c | 360 |
1 files changed, 0 insertions, 360 deletions
diff --git a/chromium/third_party/sqlite/sqlite-src-3240000/src/mutex.c b/chromium/third_party/sqlite/sqlite-src-3240000/src/mutex.c deleted file mode 100644 index 3ad7b89edc2..00000000000 --- a/chromium/third_party/sqlite/sqlite-src-3240000/src/mutex.c +++ /dev/null @@ -1,360 +0,0 @@ -/* -** 2007 August 14 -** -** 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. -** -** This file contains code that is common across all mutex implementations. -*/ -#include "sqliteInt.h" - -#if defined(SQLITE_DEBUG) && !defined(SQLITE_MUTEX_OMIT) -/* -** 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 && !defined(SQLITE_MUTEX_OMIT) */ - - -#ifndef SQLITE_MUTEX_OMIT - -#ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS -/* -** This block (enclosed by SQLITE_ENABLE_MULTITHREADED_CHECKS) contains -** the implementation of a wrapper around the system default mutex -** implementation (sqlite3DefaultMutex()). -** -** Most calls are passed directly through to the underlying default -** mutex implementation. Except, if a mutex is configured by calling -** sqlite3MutexWarnOnContention() on it, then if contention is ever -** encountered within xMutexEnter() a warning is emitted via sqlite3_log(). -** -** This type of mutex is used as the database handle mutex when testing -** apps that usually use SQLITE_CONFIG_MULTITHREAD mode. -*/ - -/* -** Type for all mutexes used when SQLITE_ENABLE_MULTITHREADED_CHECKS -** is defined. Variable CheckMutex.mutex is a pointer to the real mutex -** allocated by the system mutex implementation. Variable iType is usually set -** to the type of mutex requested - SQLITE_MUTEX_RECURSIVE, SQLITE_MUTEX_FAST -** or one of the static mutex identifiers. Or, if this is a recursive mutex -** that has been configured using sqlite3MutexWarnOnContention(), it is -** set to SQLITE_MUTEX_WARNONCONTENTION. -*/ -typedef struct CheckMutex CheckMutex; -struct CheckMutex { - int iType; - sqlite3_mutex *mutex; -}; - -#define SQLITE_MUTEX_WARNONCONTENTION (-1) - -/* -** Pointer to real mutex methods object used by the CheckMutex -** implementation. Set by checkMutexInit(). -*/ -static SQLITE_WSD const sqlite3_mutex_methods *pGlobalMutexMethods; - -#ifdef SQLITE_DEBUG -static int checkMutexHeld(sqlite3_mutex *p){ - return pGlobalMutexMethods->xMutexHeld(((CheckMutex*)p)->mutex); -} -static int checkMutexNotheld(sqlite3_mutex *p){ - return pGlobalMutexMethods->xMutexNotheld(((CheckMutex*)p)->mutex); -} -#endif - -/* -** Initialize and deinitialize the mutex subsystem. -*/ -static int checkMutexInit(void){ - pGlobalMutexMethods = sqlite3DefaultMutex(); - return SQLITE_OK; -} -static int checkMutexEnd(void){ - pGlobalMutexMethods = 0; - return SQLITE_OK; -} - -/* -** Allocate a mutex. -*/ -static sqlite3_mutex *checkMutexAlloc(int iType){ - static CheckMutex staticMutexes[] = { - {2, 0}, {3, 0}, {4, 0}, {5, 0}, - {6, 0}, {7, 0}, {8, 0}, {9, 0}, - {10, 0}, {11, 0}, {12, 0}, {13, 0} - }; - CheckMutex *p = 0; - - assert( SQLITE_MUTEX_RECURSIVE==1 && SQLITE_MUTEX_FAST==0 ); - if( iType<2 ){ - p = sqlite3MallocZero(sizeof(CheckMutex)); - if( p==0 ) return 0; - p->iType = iType; - }else{ -#ifdef SQLITE_ENABLE_API_ARMOR - if( iType-2>=ArraySize(staticMutexes) ){ - (void)SQLITE_MISUSE_BKPT; - return 0; - } -#endif - p = &staticMutexes[iType-2]; - } - - if( p->mutex==0 ){ - p->mutex = pGlobalMutexMethods->xMutexAlloc(iType); - if( p->mutex==0 ){ - if( iType<2 ){ - sqlite3_free(p); - } - p = 0; - } - } - - return (sqlite3_mutex*)p; -} - -/* -** Free a mutex. -*/ -static void checkMutexFree(sqlite3_mutex *p){ - assert( SQLITE_MUTEX_RECURSIVE<2 ); - assert( SQLITE_MUTEX_FAST<2 ); - assert( SQLITE_MUTEX_WARNONCONTENTION<2 ); - -#if SQLITE_ENABLE_API_ARMOR - if( ((CheckMutex*)p)->iType<2 ) -#endif - { - CheckMutex *pCheck = (CheckMutex*)p; - pGlobalMutexMethods->xMutexFree(pCheck->mutex); - sqlite3_free(pCheck); - } -#ifdef SQLITE_ENABLE_API_ARMOR - else{ - (void)SQLITE_MISUSE_BKPT; - } -#endif -} - -/* -** Enter the mutex. -*/ -static void checkMutexEnter(sqlite3_mutex *p){ - CheckMutex *pCheck = (CheckMutex*)p; - if( pCheck->iType==SQLITE_MUTEX_WARNONCONTENTION ){ - if( SQLITE_OK==pGlobalMutexMethods->xMutexTry(pCheck->mutex) ){ - return; - } - sqlite3_log(SQLITE_MISUSE, - "illegal multi-threaded access to database connection" - ); - } - pGlobalMutexMethods->xMutexEnter(pCheck->mutex); -} - -/* -** Enter the mutex (do not block). -*/ -static int checkMutexTry(sqlite3_mutex *p){ - CheckMutex *pCheck = (CheckMutex*)p; - return pGlobalMutexMethods->xMutexTry(pCheck->mutex); -} - -/* -** Leave the mutex. -*/ -static void checkMutexLeave(sqlite3_mutex *p){ - CheckMutex *pCheck = (CheckMutex*)p; - pGlobalMutexMethods->xMutexLeave(pCheck->mutex); -} - -sqlite3_mutex_methods const *multiThreadedCheckMutex(void){ - static const sqlite3_mutex_methods sMutex = { - checkMutexInit, - checkMutexEnd, - checkMutexAlloc, - checkMutexFree, - checkMutexEnter, - checkMutexTry, - checkMutexLeave, -#ifdef SQLITE_DEBUG - checkMutexHeld, - checkMutexNotheld -#else - 0, - 0 -#endif - }; - return &sMutex; -} - -/* -** Mark the SQLITE_MUTEX_RECURSIVE mutex passed as the only argument as -** one on which there should be no contention. -*/ -void sqlite3MutexWarnOnContention(sqlite3_mutex *p){ - if( sqlite3GlobalConfig.mutex.xMutexAlloc==checkMutexAlloc ){ - CheckMutex *pCheck = (CheckMutex*)p; - assert( pCheck->iType==SQLITE_MUTEX_RECURSIVE ); - pCheck->iType = SQLITE_MUTEX_WARNONCONTENTION; - } -} -#endif /* ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS */ - -/* -** Initialize the mutex system. -*/ -int sqlite3MutexInit(void){ - int rc = SQLITE_OK; - if( !sqlite3GlobalConfig.mutex.xMutexAlloc ){ - /* 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; - sqlite3_mutex_methods *pTo = &sqlite3GlobalConfig.mutex; - - if( sqlite3GlobalConfig.bCoreMutex ){ -#ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS - pFrom = multiThreadedCheckMutex(); -#else - pFrom = sqlite3DefaultMutex(); -#endif - }else{ - pFrom = sqlite3NoopMutex(); - } - pTo->xMutexInit = pFrom->xMutexInit; - pTo->xMutexEnd = pFrom->xMutexEnd; - pTo->xMutexFree = pFrom->xMutexFree; - pTo->xMutexEnter = pFrom->xMutexEnter; - pTo->xMutexTry = pFrom->xMutexTry; - pTo->xMutexLeave = pFrom->xMutexLeave; - pTo->xMutexHeld = pFrom->xMutexHeld; - pTo->xMutexNotheld = pFrom->xMutexNotheld; - sqlite3MemoryBarrier(); - pTo->xMutexAlloc = pFrom->xMutexAlloc; - } - assert( sqlite3GlobalConfig.mutex.xMutexInit ); - rc = sqlite3GlobalConfig.mutex.xMutexInit(); - -#ifdef SQLITE_DEBUG - GLOBAL(int, mutexIsInit) = 1; -#endif - - return rc; -} - -/* -** Shutdown the mutex system. This call frees resources allocated by -** sqlite3MutexInit(). -*/ -int sqlite3MutexEnd(void){ - int rc = SQLITE_OK; - if( sqlite3GlobalConfig.mutex.xMutexEnd ){ - rc = sqlite3GlobalConfig.mutex.xMutexEnd(); - } - -#ifdef SQLITE_DEBUG - GLOBAL(int, mutexIsInit) = 0; -#endif - - return rc; -} - -/* -** Retrieve a pointer to a static mutex or allocate a new dynamic one. -*/ -sqlite3_mutex *sqlite3_mutex_alloc(int id){ -#ifndef SQLITE_OMIT_AUTOINIT - if( id<=SQLITE_MUTEX_RECURSIVE && sqlite3_initialize() ) return 0; - if( id>SQLITE_MUTEX_RECURSIVE && sqlite3MutexInit() ) return 0; -#endif - assert( sqlite3GlobalConfig.mutex.xMutexAlloc ); - return sqlite3GlobalConfig.mutex.xMutexAlloc(id); -} - -sqlite3_mutex *sqlite3MutexAlloc(int id){ - if( !sqlite3GlobalConfig.bCoreMutex ){ - return 0; - } - assert( GLOBAL(int, mutexIsInit) ); - assert( sqlite3GlobalConfig.mutex.xMutexAlloc ); - return sqlite3GlobalConfig.mutex.xMutexAlloc(id); -} - -/* -** Free a dynamic mutex. -*/ -void sqlite3_mutex_free(sqlite3_mutex *p){ - if( p ){ - assert( sqlite3GlobalConfig.mutex.xMutexFree ); - sqlite3GlobalConfig.mutex.xMutexFree(p); - } -} - -/* -** Obtain the mutex p. If some other thread already has the mutex, block -** until it can be obtained. -*/ -void sqlite3_mutex_enter(sqlite3_mutex *p){ - if( p ){ - assert( sqlite3GlobalConfig.mutex.xMutexEnter ); - sqlite3GlobalConfig.mutex.xMutexEnter(p); - } -} - -/* -** Obtain the mutex p. If successful, return SQLITE_OK. Otherwise, if another -** thread holds the mutex and it cannot be obtained, return SQLITE_BUSY. -*/ -int sqlite3_mutex_try(sqlite3_mutex *p){ - int rc = SQLITE_OK; - if( p ){ - assert( sqlite3GlobalConfig.mutex.xMutexTry ); - return sqlite3GlobalConfig.mutex.xMutexTry(p); - } - 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. If a NULL pointer is passed as an argument -** this function is a no-op. -*/ -void sqlite3_mutex_leave(sqlite3_mutex *p){ - if( p ){ - assert( sqlite3GlobalConfig.mutex.xMutexLeave ); - sqlite3GlobalConfig.mutex.xMutexLeave(p); - } -} - -#ifndef NDEBUG -/* -** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are -** intended for use inside assert() statements. -*/ -int sqlite3_mutex_held(sqlite3_mutex *p){ - assert( p==0 || sqlite3GlobalConfig.mutex.xMutexHeld ); - return p==0 || sqlite3GlobalConfig.mutex.xMutexHeld(p); -} -int sqlite3_mutex_notheld(sqlite3_mutex *p){ - assert( p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld ); - return p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld(p); -} -#endif - -#endif /* !defined(SQLITE_MUTEX_OMIT) */ |