#include <windows.h>//必要的头文件,使用Windows API函数 #include <stdio.h> int index = 0; int tickets = 100;//票数 HANDLE hMutex; //使用全局的互斥对象来保证对同一资源的互斥访问与操作这里是tickets //线程处理函数原型,形式可从MSDN中拷贝 //线程1 的入口函数 DWORD WINAPI Fun1Proc(LPVOID lpParameter); DWORD WINAPI Fun2Proc(LPVOID lpParameter); void main() { HANDLE hThread1; DWORD thread1ID; //创建线程1 hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, &thread1ID); HANDLE hThread2; DWORD thread2ID; //创建线程2 hThread2 = CreateThread(NULL, 0, Fun2Proc, NULL, 0, &thread2ID); CloseHandle(hThread1); //关闭线程的句柄,为什么要关闭?它将线程的使用计数减1 CloseHandle(hThread2);//这样当线程结束时,线程内核对象被释放, //否则只有当进程结束,才释放线程的内核对象hThread1与hThread //创建一个互斥对象,如果成功返回互斥对象的句柄,否则返回NULL hMutex = CreateMutex(NULL, FALSE, "tickets"); if (hMutex) { if(ERROR_ALREADY_EXISTS == GetLastError()) { puts("only one instance can run!"); return; } } Sleep(4000);//主线程睡眠4秒钟,给其它线程运行的时间,因为一旦主线程退出则进行退出,其它线程也将退出 } DWORD WINAPI Fun1Proc(LPVOID lpParameter) { while(TRUE) { WaitForSingleObject(hMutex, INFINITE);//如果全局互斥对象是有信号状态,则获得该对象, //直到调用ReleaseMutex之前,互斥对象是无信号状态,其它线程不能对互斥对象进行访问 if(tickets > 0) { Sleep(1); printf("Thread1 sell tickets : %d\n", tickets-- ); } else break; ReleaseMutex(hMutex);//将互斥对象设置为有信号状态 } return 0; } DWORD WINAPI Fun2Proc(LPVOID lpParameter) { while(TRUE) { WaitForSingleObject(hMutex, INFINITE); if (tickets > 0) { Sleep(1); printf("Thread2 sell tickets : %d\n", tickets-- ); } else break; ReleaseMutex(hMutex); } return 0; }
在VC6.0中多线程编程示例(带同步信号量)
直接上代码: