C++多線程同步（采用互斥對象Mutex）

C++多線程同步（采用互斥對象Mutex）

// Mutex.cpp : 定義控制台應用程式的入口點。
//

#include "stdafx.h"
#include <Windows.h>
#include <iostream>

using namespace std;

DWORD WINAPI Proc1(LPVOID lpParameter);//線程1的入口函數

DWORD WINAPI Proc2(LPVOID lpParameter);//線程2的入口函數

int ticket = 100;
HANDLE hMutex;//全局互斥對象

void main()
{

	HANDLE hthread1;
	HANDLE hthread2;
	//建立線程
	hthread1 = CreateThread(NULL,0,Proc1,NULL,0,NULL);
	hthread2 = CreateThread(NULL,0,Proc2,NULL,0,NULL);

	CloseHandle(hthread1);//并沒有終止線程的運作；當不再需要線程句柄時，應将其關閉，讓這個線程核心對象的引用計數減1
	CloseHandle(hthread2);

	//建立互斥對象
	hMutex = CreateMutex(NULL,FALSE,NULL);

	//保證應用程式隻有一個執行個體
	if (hMutex)
	{
		if (ERROR_ALREADY_EXISTS == GetLastError())
		{
			cout<<"隻有一個執行個體可以運作！"<<endl;
			return;
		}
	}
	WaitForSingleObject(hMutex,INFINITE);
	ReleaseMutex(hMutex);
	ReleaseMutex(hMutex);

	Sleep(4000);//主線程靜默4秒

}

DWORD WINAPI Proc1(
	LPVOID lpParameter)
{   

	while (TRUE)
	{
		WaitForSingleObject(hMutex,INFINITE);
		Sleep(1);
		if (ticket > 0)
			cout<<"thread1 sell ticket: "<<ticket--<<endl;
		else
			break;
		ReleaseMutex(hMutex);
	}
	return 0;
}

DWORD WINAPI Proc2(
	LPVOID lpParameter)
{

	while (TRUE)
	{
		WaitForSingleObject(hMutex,INFINITE);
		Sleep(1);
		if (ticket > 0)
			cout<<"thread2 sell ticket: "<<ticket--<<endl;
		else
			break;
		ReleaseMutex(hMutex);
	}
	return 0;
}