Win32 线程的创建&信号量临界资源&事件对象

背景：

写了个程序，主要实现的功能为主线程创建两个子线程，之后主线程进入等待事件的循环。子线程1对临界资源cnt的值减2并输出cnt的值。子线程2对cnt的值加1并输出cnt的值，且当cnt为50的时候触发事件对象hend_even，子进程2退出。主线程收到hend_even后杀死子线程1，之后进入scanf阻塞。。。

代码示例：

#include <windows.h>
#include <stdio.h>

DWORD WINAPI funAproc(LPVOID lpParameter);
DWORD WINAPI funBproc(LPVOID lpParameter);

int cnt=100; //共享数据
HANDLE hmutex_cnt; //cnt的信号量锁
HANDLE hend_even; //事件

void main()
{
HANDLE th1,th2;
//false表示当前主线程不拥有该信号，true表示创建该信号后备主线程拥有
hmutex_cnt = CreateMutex(NULL,FALSE,NULL);
//第二个参数：
//true（人工重置事件对象，等待该事件的所有进程都将进入运行
//false（自动重置事件对象），等待该事件中的一个进程可变为调度
//第三个参数：
//true: 创建该事件对象后，触发事件，false：不触发事件。
hend_even = CreateEvent(NULL,TRUE,FALSE,NULL);

int x=2;//带参线程
//funAproc为线程入口，&x为线程函数参数，该参数为（void*）类型，如果多余一个参数可以采用传递结构体的方式
th1 = CreateThread(NULL,0,funAproc,&x,0,NULL);

th2 = CreateThread(NULL,0,funBproc,NULL,0,NULL);

while (TRUE)
{
if (cnt == 0) break;
//Sleep(1);
if(WAIT_OBJECT_0 == WaitForSingleObject(hend_even,100)){//主线程等待th2发出“终止th1的事件”，即hend_even
TerminateThread(th1,1); //终止线程
break;
}
}
printf("back to main thread... \n ");
int i;
while (scanf("%d",&i))
{
;
}
}

DWORD WINAPI funAproc(LPVOID lpParameter){
int b,c;
int k = *(int*)lpParameter;

while (cnt>0)
{
WaitForSingleObject(hmutex_cnt,INFINITE);//获取信号量，对临界资源（cnt）进行W操作
cnt -= k;
printf("thread A delete 2 of cnt = %d\n",cnt);
ReleaseMutex(hmutex_cnt); //释放信号量
}
return 0;
}
DWORD WINAPI funBproc(LPVOID lpParameter){
while (cnt>0)
{
WaitForSingleObject(hmutex_cnt,INFINITE);//获取信号量，对临界资源（cnt）进行W操作
cnt = cnt + 1;
printf("thread B add 1 of cnt = %d\n",cnt);

if (cnt == 50) //当cnt == 50的时候，终止th1和th2，此时th2触发hend_even事件，并退出
{
SetEvent(hend_even);
printf("proc B stop to sail ticket...\n");
ReleaseMutex(hmutex_cnt); //释放信号量
exit(0);
}
ReleaseMutex(hmutex_cnt); //释放信号量
}
return 0;
}


运行结果：
thread A delete 2 of cnt = 98

thread B add 1 of cnt = 99

thread A delete 2 of cnt = 97

thread B add 1 of cnt = 98

thread A delete 2 of cnt = 96

thread B add 1 of cnt = 97

thread A delete 2 of cnt = 95

thread B add 1 of cnt = 96

thread A delete 2 of cnt = 94

thread B add 1 of cnt = 95

thread A delete 2 of cnt = 93

thread B add 1 of cnt = 94

thread A delete 2 of cnt = 92

thread B add 1 of cnt = 93

thread A delete 2 of cnt = 91

thread B add 1 of cnt = 92

thread A delete 2 of cnt = 90

thread B add 1 of cnt = 91

thread A delete 2 of cnt = 89

thread B add 1 of cnt = 90

thread A delete 2 of cnt = 88

thread B add 1 of cnt = 89

...

thread A delete 2 of cnt = 51

thread B add 1 of cnt = 52

thread A delete 2 of cnt = 50

thread B add 1 of cnt = 51

thread A delete 2 of cnt = 49

thread B add 1 of cnt = 50

proc B stop to sail ticket...

proc B stop to sail ticket...

back to main thread...

参考：
http://www.cnblogs.com/1314NNNKKK/p/3386375.html http://hi.baidu.com/kdlipm/item/005be8eb29d785e1fa42bae5