线程同步:事件对象

最新推荐文章于 2020-04-16 14:03:35 发布

原创最新推荐文章于 2020-04-16 14:03:35 发布 · 472 阅读

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本文展示了一个简单的票务系统实现案例，该系统使用两个线程来出售有限数量的票，并通过事件对象进行同步，确保票数正确减少。代码示例中包含了线程创建、事件对象的使用及线程间的同步机制。

#include <Windows.h> #include <iostream> using namespace std; DWORD WINAPI Func1Proc( LPVOID lpParameter ); DWORD WINAPI Func2Proc( LPVOID lpParameter ); int tickets = 100; HANDLE g_hEvent; int main() { HANDLE hThread1; HANDLE hThread2; hThread1 = CreateThread(NULL, 0, Func1Proc, NULL, 0, NULL); hThread2 = CreateThread(NULL, 0, Func2Proc, NULL, 0, NULL); CloseHandle(hThread1); CloseHandle(hThread2); g_hEvent = CreateEvent(NULL, FALSE, FALSE, L"tickets"); if (g_hEvent) { if(GetLastError() == ERROR_ALREADY_EXISTS) { cout << "alreay a instance is running" << endl; return 0; } } SetEvent(g_hEvent); Sleep(2000); CloseHandle(g_hEvent); return 0; } DWORD WINAPI Func1Proc( LPVOID lpParameter ) { while(TRUE) { WaitForSingleObject(g_hEvent, INFINITE); //ResetEvent(g_hEvent); if (tickets > 0) { Sleep(10); cout << "thread1 sell ticket : " << tickets-- << endl; } else break; SetEvent(g_hEvent); } return 0; } DWORD WINAPI Func2Proc( LPVOID lpParameter ) { while(TRUE) { WaitForSingleObject(g_hEvent, INFINITE); //ResetEvent(g_hEvent); if (tickets > 0) { Sleep(10); cout << "thread2 sell ticket : " << tickets-- << endl; } else break; SetEvent(g_hEvent); } return 0; }