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C++使用内核对象互斥体（Mutex)实现线程同步锁，当两个线程共同访问一个共享资源时，Mutex可以只向一个线程授予访问权。
下面的例子模拟了售票系统，定义了两个售票线程
/// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//
//mutex
#include “stdafx.h”
#include <stdio.h>
#include<windows.h>
#include<process.h>
void __cdecl threadProc1(void* param);
void __cdecl threadProc2(void* param);
int tickets = 100;
HANDLE hMutex = INVALID_HANDLE_VALUE;
int main()
{
hMutex = CreateMutex(NULL, FALSE, NULL);
HANDLE hThread1 =(HANDLE)_beginthread(threadProc1, 0, “A:”);
HANDLE hThread2 = (HANDLE)_beginthread(threadProc2, 0, “B:”);
HANDLE hThread[] = { hThread1 ,hThread2 };
WaitForMultipleObjects(2, hThread, true, INFINITE);
return 0;
}
void __cdecl threadProc1(void* param) {
char *p = (char *)param;
while (tickets > 0) {
WaitForSingleObject(hMutex, INFINITE);//等待Mutex释放
if (tickets > 0) {
printf(“%s sell ticket %d\n”, p, tickets–);
}
ReleaseMutex(hMutex);//释放mutex
}
}
void __cdecl threadProc2(void* param) {
char *p = (char *)param;
while (tickets > 0) {
WaitForSingleObject(hMutex, INFINITE);//等待Mutex释放
if (tickets > 0) {
printf(“%s sell ticket %d\n”, p, tickets–);
}
ReleaseMutex(hMutex);//释放mutex
}
}
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