孙鑫 VC++深入详解第16课——线程同步与异步套接字编程

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1.通过事件对象实现同步

①创建事件对象CreateEvent

②设置为激活常态SetEvent

③等待信号量WaitForSingleObject

④关闭事件句柄CloseHandle

代码：

#include <Windows.h>#include <iostream>using namespace std;int tickets = 100;HANDLE g_Event;//事件对象句柄DWORD WINAPI OneSellTickets(LPVOID lpParam);DWORD WINAPI TwoSellTickets(LPVOID lpParam);void main(){//创建事件句柄，g_Event = CreateEvent(NULL,              //安全性，默认是NULL  FALSE, //FALSE表示线程释放后自动复位为无信号，TRUE要手动复位  FALSE, //TRUE表示有信号状态，FALSE表示无信号状态  TEXT("tickets"));if (g_Event){if (ERROR_ALREADY_EXISTS == GetLastError()){cout<<"only one instance can run"<<endl;return ;}}SetEvent(g_Event);HANDLE handleOne = CreateThread(NULL,0,OneSellTickets,NULL,0,NULL);HANDLE handleTwo = CreateThread(NULL,0,TwoSellTickets,NULL,0,NULL);    CloseHandle(handleOne);CloseHandle(handleTwo);Sleep(1000);CloseHandle(g_Event);cin.get();cin.get();}DWORD WINAPI OneSellTickets(LPVOID lpParam){while (TRUE){WaitForSingleObject(g_Event,INFINITE);if (tickets > 0){cout<<"One Sell Tickets"<<tickets--<<endl;SetEvent(g_Event);} else{SetEvent(g_Event);break;}}return 0;}DWORD WINAPI TwoSellTickets(LPVOID lpParam){while (TRUE){WaitForSingleObject(g_Event,INFINITE);if (tickets > 0){cout<<"Two Sell Tickets"<<tickets-- <<endl;SetEvent(g_Event);} else{SetEvent(g_Event);break;}}return 0;}

2.临界区：

①设置临界区结构体 CRITICAL_SECTION

②初始化临界区 InitializeCriticalSection

③进入临界区 EnterCriticalSection

④离开临界区 LeaveCriticalSection

⑤销毁临界区 DeleteCriticalSection

#include <Windows.h>#include <iostream>using namespace std;int tickets = 100;CRITICAL_SECTION g_cs;//设置临界区结构体的全局变量DWORD WINAPI OneSellTickets(LPVOID lpParam);DWORD WINAPI TwoSellTickets(LPVOID lpParam);void main(){InitializeCriticalSection(&g_cs);HANDLE handleOne = CreateThread(NULL,0,OneSellTickets,NULL,0,NULL);HANDLE handleTwo = CreateThread(NULL,0,TwoSellTickets,NULL,0,NULL);CloseHandle(handleOne);CloseHandle(handleTwo);Sleep(1000);DeleteCriticalSection(&g_cs);cin.get();cin.get();}DWORD WINAPI OneSellTickets(LPVOID lpParam){while (TRUE){EnterCriticalSection(&g_cs);if (tickets > 0){cout<<"One Sell Tickets"<<tickets--<<endl;LeaveCriticalSection(&g_cs);} else{LeaveCriticalSection(&g_cs);break;}}return 0;}DWORD WINAPI TwoSellTickets(LPVOID lpParam){while (TRUE){EnterCriticalSection(&g_cs);if (tickets > 0){cout<<"Two Sell Tickets"<<tickets-- <<endl;LeaveCriticalSection(&g_cs);} else{LeaveCriticalSection(&g_cs);break;}}return 0;}

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