Sempahore

#include<iostream>#include<windows.h>#include<process.h>#define max 10using namespace std;CRITICAL_SECTION cs;HANDLE hHandle;  //Semaphore handleint 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