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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/*
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** 2012-01-30
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** Mutex functions for LSM.
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*/
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#include "lsmInt.h"
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/*
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** Allocate a new mutex.
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*/
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int lsmMutexNew(lsm_env *pEnv, lsm_mutex **ppNew){
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return pEnv->xMutexNew(pEnv, ppNew);
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}
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/*
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** Return a handle for one of the static mutexes.
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*/
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int lsmMutexStatic(lsm_env *pEnv, int iMutex, lsm_mutex **ppStatic){
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return pEnv->xMutexStatic(pEnv, iMutex, ppStatic);
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}
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/*
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** Free a mutex allocated by lsmMutexNew().
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*/
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void lsmMutexDel(lsm_env *pEnv, lsm_mutex *pMutex){
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if( pMutex ) pEnv->xMutexDel(pMutex);
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}
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/*
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** Enter a mutex.
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*/
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void lsmMutexEnter(lsm_env *pEnv, lsm_mutex *pMutex){
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pEnv->xMutexEnter(pMutex);
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}
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/*
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** Attempt to enter a mutex, but do not block. If successful, return zero.
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** Otherwise, if the mutex is already held by some other thread and is not
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** entered, return non zero.
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**
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** Each successful call to this function must be matched by a call to
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** lsmMutexLeave().
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*/
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int lsmMutexTry(lsm_env *pEnv, lsm_mutex *pMutex){
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return pEnv->xMutexTry(pMutex);
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}
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/*
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** Leave a mutex.
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*/
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void lsmMutexLeave(lsm_env *pEnv, lsm_mutex *pMutex){
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pEnv->xMutexLeave(pMutex);
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}
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#ifndef NDEBUG
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/*
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** Return non-zero if the mutex passed as the second argument is held
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** by the calling thread, or zero otherwise. If the implementation is not
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** able to tell if the mutex is held by the caller, it should return
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** non-zero.
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**
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** This function is only used as part of assert() statements.
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*/
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int lsmMutexHeld(lsm_env *pEnv, lsm_mutex *pMutex){
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return pEnv->xMutexHeld ? pEnv->xMutexHeld(pMutex) : 1;
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}
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/*
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** Return non-zero if the mutex passed as the second argument is not
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** held by the calling thread, or zero otherwise. If the implementation
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** is not able to tell if the mutex is held by the caller, it should
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** return non-zero.
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**
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** This function is only used as part of assert() statements.
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*/
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int lsmMutexNotHeld(lsm_env *pEnv, lsm_mutex *pMutex){
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return pEnv->xMutexNotHeld ? pEnv->xMutexNotHeld(pMutex) : 1;
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}
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#endif
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