DataExchangePipe.cpp
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#include <stdlib.h>
#include <string.h>
#include "DataExchangePipe.h"
CDataExchangePipe::CDataExchangePipe(long lDataBufferCount)
{
m_lDataBufferCount = lDataBufferCount;
m_pBuffer = malloc(sizeof(DataExchangeBlock) * (m_lDataBufferCount + 1));
m_ppDataBuffers = (DataExchangeBlock**) malloc(sizeof(DataExchangeBlock*) * (m_lDataBufferCount + 1));
m_ppDataBuffers[0] = (DataExchangeBlock*) m_pBuffer;
for (int i = 1; i <= m_lDataBufferCount; i++)
{
m_ppDataBuffers[i] = m_ppDataBuffers[i - 1] + 1;
m_ppDataBuffers[i]->wDataLen = 0;
}
m_lFirstIndex = 0;
m_lCurrentIndex = 0;
m_ppDataBuffers[m_lCurrentIndex]->wDataLen = 0;
}
CDataExchangePipe::~CDataExchangePipe()
{
if (m_pBuffer)
{
free(m_pBuffer);
m_pBuffer = NULL;
}
if (m_ppDataBuffers)
{
free(m_ppDataBuffers);
m_ppDataBuffers = NULL;
}
}
DataExchangeBlock* CDataExchangePipe::GetDataExchangeBlock(DWORD nTimeOut)
{
m_DataArriveEvent.Wait(nTimeOut);
Lock();
//add by wg 2016-02-29
//if not receive data arrive event, means no data arrived, just return NULL pointer
//不删除锁之外的wait，是为了节省因锁定后等待而带来的时间浪费，降低了系统的并发度
INT32 iRes = m_DataArriveEvent.Wait(0);
if (iRes == CON_EVENT_TIME_OUT)
{
Unlock();
return NULL;
}
//add over
if (m_ppDataBuffers[m_lFirstIndex]->wDataLen == 0)
{
m_DataArriveEvent.ResetEvent();
Unlock();
return NULL;
}
DataExchangeBlock* p;
m_ppDataBuffers[m_lDataBufferCount]->wDataLen = 0;
p = m_ppDataBuffers[m_lFirstIndex];
m_ppDataBuffers[m_lFirstIndex] = m_ppDataBuffers[m_lDataBufferCount];
m_ppDataBuffers[m_lDataBufferCount] = p;
if (m_lCurrentIndex == m_lFirstIndex)
{
m_lCurrentIndex = 0;
m_lFirstIndex = 0;
m_DataArriveEvent.ResetEvent();
}
else
{
m_lFirstIndex = (m_lFirstIndex + 1) % m_lDataBufferCount;
}
m_DataBufferAvailableEvent.SetEvent();
Unlock();
return m_ppDataBuffers[m_lDataBufferCount];
}
BOOL CDataExchangePipe::PutData(void *pData, INT32 wDataLen, DWORD nTimeOut, BOOL bNotifyImmediate)
{
if (nTimeOut > 0)
{
m_DataBufferAvailableEvent.Wait(nTimeOut);
}
Lock();
if (m_ppDataBuffers[m_lCurrentIndex]->wDataLen + wDataLen > DATA_EXCHANGE_BLOCK_SIZE)
{
// m_DataArriveEvent.SetEvent();//delete by wg: 2016-03-23
if ((m_lCurrentIndex + 1) % m_lDataBufferCount == m_lFirstIndex)
{
m_DataBufferAvailableEvent.ResetEvent();
Unlock();
return FALSE;
}
else
{
if (wDataLen > DATA_EXCHANGE_BLOCK_SIZE)
{
Unlock();
return FALSE;
}
m_lCurrentIndex = (m_lCurrentIndex + 1) % m_lDataBufferCount;
}
}
memcpy(m_ppDataBuffers[m_lCurrentIndex]->lpData + m_ppDataBuffers[m_lCurrentIndex]->wDataLen, pData, wDataLen);
m_ppDataBuffers[m_lCurrentIndex]->wDataLen += wDataLen;
if (bNotifyImmediate)
{
m_DataArriveEvent.SetEvent();
}
Unlock();
return TRUE;
}
void CDataExchangePipe::ClearData()
{
Lock();
for (int i = 1; i <= m_lDataBufferCount; i++)
{
m_ppDataBuffers[i]->wDataLen = 0;
}
m_lFirstIndex = 0;
m_lCurrentIndex = 0;
m_ppDataBuffers[m_lCurrentIndex]->wDataLen = 0;
m_DataArriveEvent.ResetEvent();
m_DataBufferAvailableEvent.SetEvent();
Unlock();
}
BOOL CDataExchangePipe::PutDataEx(void *pData, INT32 wDataLen, DWORD nTimeOut, BOOL bNotifyImmediate)
{
if (PutData(pData, wDataLen, 0, bNotifyImmediate))
{
return TRUE;
}
else
{
if (PutData(pData, wDataLen, nTimeOut, bNotifyImmediate))
{
return TRUE;
}
else
{
return FALSE;
}
}
}
void CDataExchangePipe::LockPut()
{
m_MultiPutObject.Lock();
}
void CDataExchangePipe::UnlockPut()
{
m_MultiPutObject.Unlock();
}
BOOL CDataExchangePipe::MultiPut(void *pData, INT32 wDataLen, DWORD nTimeOut, BOOL bNotifyImmediate)
{
LockPut();
if (PutData(pData, wDataLen, 0, bNotifyImmediate))
{
UnlockPut();
return TRUE;
}
else
{
if (PutData(pData, wDataLen, nTimeOut, bNotifyImmediate))
{
UnlockPut();
return TRUE;
}
else
{
UnlockPut();
return FALSE;
}
}
}