MFC信号量对象实现多线程范例

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MFC信号量对象实现多线程范例

// vs23_5_7.cpp : 定义控制台应用程序的入口点。
//txwtech vs2010

#include "stdafx.h"
#include "windows.h"
DWORD WINAPI ThreadProc1(LPVOID lpParam);
DWORD WINAPI ThreadProc2(LPVOID lpParam);
int iGolbalCount=0;
int iMax=12;
int cMax=1;
HANDLE hSemaphore;
int _tmain(int argc, _TCHAR* argv[])
{
	
	HANDLE hThread1,hThread2;
//	hSemaphore=CreateSemaphore(NULL,cMax,iMax,NULL);//
	hSemaphore=CreateSemaphore(NULL,cMax,cMax,NULL);
	if(hSemaphore==NULL)
	{
		printf("创建信号量对象失败");
		return 0;
	}
	hThread1=CreateThread(NULL,0,ThreadProc1,NULL,0,NULL);
	hThread2=CreateThread(NULL,0,ThreadProc2,NULL,0,NULL);
	Sleep(50000);
	printf("主线程结束\n");
	Sleep(30000);
	return 0;
}
DWORD WINAPI ThreadProc1(LPVOID lpParam)
{
	long count;
	while(true)
	{
    DWORD dwWaitResult=WaitForSingleObject(hSemaphore,0L);//等待时间太短
	//DWORD dwWaitResult=WaitForSingleObject(hSemaphore,INFINITE);//无限等待
	if(dwWaitResult==WAIT_OBJECT_0)
	 {
		if(iGolbalCount<iMax)
		  {
		printf("这里是线程1，iGolbalCount=%d\r\n",iGolbalCount++);
		//ReleaseSemaphore(hSemaphore,1,NULL);
		ReleaseSemaphore(hSemaphore,1,&count);
	      }
	else
	     {
		//ReleaseSemaphore(hSemaphore,1,NULL);
			 ReleaseSemaphore(hSemaphore,1,&count);
	    break;
	     }
	 }
	Sleep(500);//休眠时间很关键
	 }
	
	return 0;
}
DWORD WINAPI ThreadProc2(LPVOID lpParam)
{
	long count;
	while(true)
	{
    // DWORD dwWaitResult=WaitForSingleObject(hSemaphore,INFINITE);
		DWORD dwWaitResult=WaitForSingleObject(hSemaphore,0L);
	if(dwWaitResult==WAIT_OBJECT_0)
	 {
		if(iGolbalCount<iMax)
		  {
		printf("这里是线程2，iGolbalCount=%d\r\n",iGolbalCount++);
		//ReleaseSemaphore(hSemaphore,1,NULL);
		ReleaseSemaphore(hSemaphore,1,&count);
	      }
	else
	     {
		//ReleaseSemaphore(hSemaphore,1,NULL);
			 ReleaseSemaphore(hSemaphore,1,&count);
	    break;
	     }
	 }
	Sleep(500);
	 }
	
	return 0;
}