读写者问题?--比较难

[bluesoalr]

TRACE("%d err: %d\n", m_uLocalPort, GetLastError() )打印的错误代码是288
error Lookup的解释为:
企图释放并非呼叫方所拥有的多用户终端运行程序。

读者的代码:
int CUdpSendSocket::WriteData()
{
WSABUF * p;
m_hWriteMutex = OpenMutex( MUTEX_ALL_ACCESS, FALSE, g_lpszWriteMutexName );
m_hReadMutex = OpenMutex( MUTEX_ALL_ACCESS, FALSE, g_lpszReadMutexName );
ASSERT( NULL != m_hWriteMutex );
ASSERT( NULL != m_hReadMutex );
while ( 1 )
{
p = m_pQueue->GetQueueObject(); //return after get an obj

WaitForSingleObject( &m_hReadMapMutex, INFINITE );
if( g_lReadCount == 0 )
{
WaitForSingleObject( &m_hWriteMutex, INFINITE);
}
g_lReadCount++;
ReleaseMutex(m_hReadMutex);

TRACE("%d err: %d\n", m_uLocalPort, GetLastError() );
//send to network

WaitForSingleObject( &m_hReadMutex, INFINITE);
CUtility::g_lReadCount--;
if( g_lReadCount == 0 )
{
ReleaseMutex(m_hWriteMutex);
}
ReleaseMutex(m_hReadMutex);

free(p->buf);
free(p);
}//while (1)
return 0;
}

[GameWeaverDummy]

顶

[bluesoalr]

WaitForSingleObject中的句柄前为什么都加取地址符&
是从windows高级编程(Jefferey Richter)上抄的，我本来没有加&的

写数据的肯定对。写数据没用到ReadMapMutex
读数据出现过WaitForSingleObject( m_hReadMapMutex, INFINITE )也不返回的情况

[薛定谔之死猫]

gz

[szclm]

288 Attempt to release mutex not owned by caller. ERROR_NOT_OWNER
尝试去释放一个不是自己的互斥量

错误应该是这句吧：ReleaseMutex(m_hReadMutex);

[xstring]

WaitForSingleObject( &m_hReadMapMutex, INFINITE );
if( g_lReadCount == 0 )
{
WaitForSingleObject( &m_hWriteMutex, INFINITE);
}
g_lReadCount++;
ReleaseMutex(m_hReadMutex);

Wait的是m_hReadMapMutex，Release的怎么是m_hReadMutex?

[enoloo]

WaitForSingleObject( &m_hReadMapMutex, INFINITE );
if( g_lReadCount == 0 )
{
WaitForSingleObject( &m_hWriteMutex, INFINITE);
}
g_lReadCount++;
ReleaseMutex(m_hReadMutex);
我开始也没大注意。m_hReadMapMutex从哪里来的？？是m_hReadMutex把？？）
还有，如果方便的话，把write部分也贴出来。

[bluesoalr]

所有代码：（程序改了一下，但问题相同）
说明：CUtility::g_hXXXMutex为静态变量，程序初始化时候创建相应的Mutex；

读者:
while ( 1 )
{
p = m_pQueue->GetQueueObject(); //return after get an obj

WaitForSingleObject( CUtility::g_hReadMapMutex, INFINITE );
if( CUtility::g_lReadCount == 0 )
{
WaitForSingleObject(CUtility::g_hWriteMapMutex, INFINITE);
}
InterlockedIncrement( &(CUtility::g_lReadCount) );
ReleaseMutex(CUtility::g_hReadMapMutex);

.........//do something;

WaitForSingleObject(CUtility::g_hReadMapMutex, INFINITE);
InterlockedDecrement( &(CUtility::g_lReadCount)) ;
if( CUtility::g_lReadCount == 0)
{
ReleaseMutex(CUtility::g_hWriteMapMutex);
}
ReleaseMutex(CUtility::g_hReadMapMutex);

}//while (1)
**************************
写者
while (TRUE)
{
WaitForSingleObject( CUtility::g_hEventUpdateClientMap, INFINITE);
WaitForSingleObject(CUtility::g_hWriteMapMutex, INFINITE);

.........//do something;

ReleaseMutex(CUtility::g_hWriteMapMutex);

}

[xstring]

？？？

你的WaitForSingleObject中的句柄前为什么都加取地址符&

这样Wait能成功么？

太粗心了！！

[快乐鹦鹉]

看不明白，帮你up

[enoloo]

同意xstring(麻雀)，，句柄用错了/

读数据的逻辑是对的。写数据的呢？？

[enoloo]

将m_writemutex改成semaphore试试