索求和释放“各个锁定”

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注：调用 My  WaitForSingleObject()会做出锁定操作，调用ReleaseMutex()或RelaeseSemaphore()则会做出解除锁定的操作。

BOOL AcquireReadLock(RWLock *pLock)
{
BOOL result = TRUE;
if (!MyWaitForSingleObject(pLock->hMutex))
return FALSE;
if (++pLock->nReaderCount == 1)
result = MyWaitForSingleObject(pLock->hDataLock);
ReleaseMutex(pLock->hMutex);
return result;
}


BOOL ReleaseReadLock(RWLock * pLock)
{
int result;
LONG lPrevCount;
if (!MyWaitForSingleObject(pLock->hMutex))
return FALSE;
if (--pLock->nReaderCount == 0)
{
result = ReleaseSemapore(pLock->hDataLock, 1, &lPrevCount);
}
ReleaseMutex(pLock->hMutex);
return result;
}
BOOL AcquireWriteLock(RWLock *pLock)
{
return MyWaitForSingleObject(pLock->hDataLock);
}
BOOL ReleaseWriteLock(RWLock *pLock)
{
int result;
LONG lPrevCount;
result = ReleaseSemaphore(pLock->hDataLock, 1, &PrevCount);
if (lPrevCount != 0)
FatalError("ReleaseWriteLock - Semaphore was not locked!");
return result;
}

锁定数据的时机：

索求和释放“各个锁定”

标签：

原文地址：http://blog.csdn.net/wangfengfan1/article/details/47070681