【语言-C++】多线程通同步 临界区 CCriticalSection 与 CSingleLock
【语言-C++】多线程通同步 临界区 CCriticalSection 与 CSingleLock
全栈程序员站长
发布于 2022-09-09 09:29:06
发布于 2022-09-09 09:29:06
文章被收录于专栏：全栈程序员必看
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多线程通同步与互斥示例
下面示例是一个相机处理和显示分开的两个线程：
定义临界区使用单锁
#define _CRITICAL_LOCK(critical_lock) CSingleLock locker(&critical_lock); locker.Lock();
CCriticalSection _critical_data2;启动线程，创建四个事件：停止线程事件、处理图像事件、显示图像事件和接收图像事件
停止线程事件：线程接受自动复位 ，初始状态为无信号状态；控制两个线程同时结束
处理图像事件：手动复位，初始状态为无信号状态；
显示图像事件：手动复位，初始状态为无信号状态；
接收图像事件：手动复位，初始状态为有信号状态；
处理图像事件和显示图像事件同时发生时，激活图像处理线程，进行图像处理；接收图像事件的时间的触发由显示图像完成后触发；处理图像事件由相机线程图像传输来触发；
显示图像事件发生时激活显示图像线程进行图像处理。
创建线程
void CMainDlgEx::StartThread()
{
m_EventStop = CreateEvent(NULL,TRUE,FALSE,NULL);
m_EventDealImage = CreateEvent(NULL,FALSE,FALSE,NULL);
m_EventImageShow = CreateEvent(NULL,FALSE,FALSE,NULL);
m_EventAllowReceiveImage = CreateEvent(NULL,FALSE,TRUE,NULL);
// auxiliary methods
ResetEvent(m_EventStop);
SetEvent(m_EventAllowReceiveImage);
// 启动三个线程
m_HTDealImage = (HANDLE)_beginthreadex(NULL,
0,
(unsigned (__stdcall *)(void*)) &Thread_DealImage,
this,
0,
&m_IDDealImage);
m_HTShowImage = (HANDLE)_beginthreadex(NULL,
0,
(unsigned (__stdcall *)(void*))&Thread_ShowImage,
this,
0,
&m_IDShowImage);
}关闭线程
void CMainDlgEx::CloseThread()
{
SetEvent(m_EventStop);
WaitForSingleObject(m_HTShowImage,INFINITE);
WaitForSingleObject(m_HTDealImage,INFINITE);
if (m_EventStop!=NULL &&m_EventStop !=INVALID_HANDLE_VALUE)
CloseHandle(m_EventStop);
if (m_EventDealImage!=NULL &&m_EventDealImage !=INVALID_HANDLE_VALUE)
CloseHandle(m_EventDealImage);
if (m_EventAllowReceiveImage!=NULL &&m_EventAllowReceiveImage !=INVALID_HANDLE_VALUE)
CloseHandle(m_EventAllowReceiveImage );
if (m_EventImageShow!=NULL &&m_EventImageShow !=INVALID_HANDLE_VALUE)
CloseHandle(m_EventImageShow);
DeleteCriticalSection(&m_DealImageMutex);
}处理线程
void Thread_DealImage(LPVOID *lpParam)
{
OutputDebugString(_T("处理中 ....启动\n"));
HANDLE eventHandle[2];
CMainDlgEx *MultiThrDlg = (CMainDlgEx*) lpParam;
eventHandle[0] = (*MultiThrDlg).m_EventAllowReceiveImage;
eventHandle[1] = (*MultiThrDlg).m_EventDealImage;
while (WAIT_OBJECT_0 != WaitForSingleObject((MultiThrDlg->m_EventStop),0))
{
//抓取数据到grabData中
while (WAIT_OBJECT_0 == WaitForMultipleObjects(2,eventHandle,TRUE,0))
{
_CRITICAL_LOCK(_critical_data2);
OutputDebugString(_T("处理中 ....\n"));
SetEvent(MultiThrDlg->m_EventImageShow);
}
}
ResetEvent(MultiThrDlg->m_EventDealImage);
ResetEvent(MultiThrDlg->m_EventAllowReceiveImage);
OutputDebugString(_T("处理中 ....退出\n"));
return;
}显示线程 extern void Thread_ShowImage( LPVOID *lpParam ) { HANDLE eventHandle[2]; CMainDlgEx *MultiThrDlg = (CMainDlgEx*) lpParam; OutputDebugString(_T("显示中 ....启动\n")); while (WAIT_OBJECT_0 != WaitForSingleObject((MultiThrDlg->m_EventStop),0)) { //抓取数据到grabData中 while (WAIT_OBJECT_0 == WaitForSingleObject((MultiThrDlg->m_EventImageShow),0)) { _CRITICAL_LOCK(_critical_data2); OutputDebugString(_T("显示中 ....\n")); SetEvent(MultiThrDlg->m_EventAllowReceiveImage); } } ResetEvent(MultiThrDlg->m_EventImageShow); ResetEvent(MultiThrDlg->m_EventAllowReceiveImage); OutputDebugString(_T("显示中 ....退出\n")); return; }
数据到达
LRESULT CMainDlgEx::OnCameraDataArrive(WPARAM w, LPARAM l)
{
SetEvent(m_EventDealImage);
return -1;
}发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/162060.html原文链接：https://javaforall.cn
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