使用信号量机制同步线程

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信号量的使用：

信号量的创建：CreateSemaphore(属性指针，初始值，最大值，名称)。

信号量的释放：ReleaseSemaphore(句柄，增加值，原先值指针)。

打开一个信号量：OpenSemaphore(期望的访问权限，是否继承，名称)；

#include <iostream>#include <Windows.h>using namespace std;#define THREAD_INSTANCE_NUMBER 3DWORD foo(void* pData){int threadNumberTemp = *(int *)pData;HANDLE hSemaphore;cout << "foo: " << threadNumberTemp << " is running" << endl;if ((hSemaphore = OpenSemaphore(SEMAPHORE_ALL_ACCESS, FALSE, (LPCWSTR)"Semaphore.Test")) == NULL){cout << "open semaphore error." << endl;}cout << "foo: " << threadNumberTemp << " gets the semaphore" << endl;ReleaseSemaphore(hSemaphore, 1, NULL);CloseHandle(hSemaphore);return 0;}int main(){DWORD ThreadID[THREAD_INSTANCE_NUMBER];HANDLE hThread[THREAD_INSTANCE_NUMBER];HANDLE hSemaphore;if ((hSemaphore = CreateSemaphore(NULL, 1, 1, (LPCWSTR)"Semaphore.Test")) == NULL){cout << "create semaphore error" << endl;return 0;}for (int i = 0; i < THREAD_INSTANCE_NUMBER; i++){hThread[i] = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)foo,(void*)&hThread[i],0,&(ThreadID[i]));if (hThread[i] == NULL){cout << "create error: " << ThreadID[i] << endl; }else{cout << "create thread: " << ThreadID[i] << endl;}}WaitForMultipleObjects(THREAD_INSTANCE_NUMBER, hThread, TRUE, INFINITE);CloseHandle(hSemaphore);return 0;}

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