线程互斥、等候、重置等14.4.29

// Mutex.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "windows.h"
#include "conio.h"

HANDLE g_nMutex=NULL;
int g_ncount=0;
DWORD WINAPI ThreadProcl1(LPVOID pParam){
	while(1){
		//等候互斥
		WaitForSingleObject(g_nMutex,INFINITE);
		printf("ThreadProcl1------------\n");
		g_ncount++;
		printf("%d\n",g_ncount);
		Sleep(500);
		//释放互斥量
		ReleaseMutex(g_nMutex);
	}
	return 0;
}

DWORD WINAPI ThreadProcl2(LPVOID pParam){
	while(1){
		WaitForSingleObject(g_nMutex,INFINITE);
		printf("------------ThreadProcl2\n");
		g_ncount++;
		printf("%d\n",g_ncount);

		Sleep(500);
		ReleaseMutex(g_nMutex);
	
	}
	return 0;
}

DWORD WINAPI ThreadProcl3(LPVOID pParam){
	while(1){
		WaitForSingleObject(g_nMutex,INFINITE);
		printf("-------ThreadProcl3-----\n");
		g_ncount++;
		printf("%d\n",g_ncount);

		Sleep(500);
		//重置互斥
		ReleaseMutex(g_nMutex);
	
	}
	return 0;
}

void Create(){
	DWORD tID=0;
	HANDLE hThread[3]={NULL};
	hThread[0]=CreateThread(NULL,0,ThreadProcl1,NULL,0,&tID);

	hThread[1]=CreateThread(NULL,0,ThreadProcl2,NULL,0,&tID);

	hThread[2]=CreateThread(NULL,0,ThreadProcl3,NULL,0,&tID);
}
int main(int argc, char* argv[])
{
	//创建互斥 第二个参数如果是true 就表示当前开始线程也加入了互斥
	//这样的话 MAIN也是一个线程 必须把MAIN函数执行完才执行线程1线程2
	//可是mian线程结束了 我们程序也结束了 线程1这些也不会执行 所以没什么意思
	g_nMutex=CreateMutex(NULL,false,NULL);
	Create();
	getch();
	CloseHandle(g_nMutex);
	return 0;
}