Sempahore

#include<iostream>
#include<windows.h>
#include<process.h>
#define max 10
using namespace std;
CRITICAL_SECTION cs;
HANDLE hHandle;  //Semaphore handle
int semanum;
unsigned int _stdcall ThreadFunc(LPVOID lpa)
{
	int k = *(int *)lpa;
	ReleaseSemaphore(hHandle, 1, NULL);
	Sleep(500);
	EnterCriticalSection(&cs);
	semanum++;
	Sleep(100);
	cout << "Thread ID Is  " <<k << ", num = " << semanum << endl;
	LeaveCriticalSection(&cs);
	return 0;
}
int main()
{
	hHandle = CreateSemaphore(NULL, 0, 1, NULL);
	InitializeCriticalSection(&cs);
	HANDLE Handle[max] = { 0 };
	int i = 0;
	semanum = 0;
	while (i<max)
	{
		Handle[i] = (HANDLE)_beginthreadex(NULL, 0, ThreadFunc, &i, 0, 0);
		WaitForSingleObject(hHandle, INFINITE);
		i++;
	}
	WaitForMultipleObjects(10, Handle, TRUE, INFINITE);

	CloseHandle(hHandle);
	for (int j = 0; j<10; j++)
	{
		CloseHandle(Handle[j]);
	}
	DeleteCriticalSection(&cs);
	cout << "Program End!!" << endl;
	system("pause");
	return 0;
}

CreateSemaphore参数：

<div class="para" label-module="para">lpSemaphoreAttributes SECURITY_ATTRIBUTES，指定一个SECURITY_ATTRIBUTES结构，或传递零值（将参数声明为ByVal As Long，并传递零值）——表示采用不允许继承的默认描述符。该参数定义了<a target=_blank href="http://baike.baidu.com/view/1303265.htm" target="_blank">信号量</a>的安全特性</div><div class="para" label-module="para">lInitialCount Long，设置信号量的初始计数。可设置零到lMaximumCount之间的一个值</div><div class="para" label-module="para">lMaximumCount Long，设置信号量的最大计数</div><div class="para" label-module="para">lpName String，指定信号量对象的名称。用vbNullString可创建一个<a target=_blank href="http://baike.baidu.com/view/1418045.htm" target="_blank">未命名</a>的<a target=_blank href="http://baike.baidu.com/view/1303265.htm" target="_blank">信号量</a>对象。如果已经存在拥有这个名字的一个信号量，就直接打开现成的信号量。这个名字可能不与一个现有的<a target=_blank href="http://baike.baidu.com/view/3074680.htm" target="_blank">互斥体</a>、事件、可等待<a target=_blank href="http://baike.baidu.com/view/928508.htm" target="_blank">计时器</a>或文件映射的名称相符</div>

通常第一个和第四个都设为0