線程同步 （事件對象）

事件對象①、 HANDLE g_hEvent;   定義一個 HANDLE 類型的變數②、 g_hEvent=CreateEvent(NULL,FALSE,FALSE,"tickets");   CreateEvent函數建立一個事件對象③、 SetEvent(g_hEvent);    在建立完成之後 立即使用SetEvent函數設定事件對象的訊號狀態 ④、 WaitForSingleObject(g_hEvent,INFINITE);  在保護資料地方使用它來進行讓其他訪問等待⑤、 SetEvent(g_hEvent);  設定事件的狀態為有訊號(此時其他等待的對象使用這個對象)⑥、 CloseHandle(g_hEvent); 在不在使用事件對象時得調用CloseHandle關閉它範例程式碼#include <windows.h>#include <iostream.h>DWORD WINAPI Fun1Proc(  LPVOID lpParameter   // thread data);DWORD WINAPI Fun2Proc(  LPVOID lpParameter   // thread data);int tickets=100;HANDLE g_hEvent;void main(){HANDLE hThread1;HANDLE hThread2;hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);CloseHandle(hThread1);CloseHandle(hThread2);//g_hEvent=CreateEvent(NULL,FALSE,FALSE,NULL);g_hEvent=CreateEvent(NULL,FALSE,FALSE,"tickets");if(g_hEvent){if(ERROR_ALREADY_EXISTS==GetLastError()){cout<<"only instance can run!"<<endl;return;}}SetEvent(g_hEvent);Sleep(4000);CloseHandle(g_hEvent);}DWORD WINAPI Fun1Proc(  LPVOID lpParameter   // thread data){while(TRUE){WaitForSingleObject(g_hEvent,INFINITE);//ResetEvent(g_hEvent);if(tickets>0){Sleep(1);cout<<"thread1 sell ticket : "<<tickets--<<endl;}elsebreak;SetEvent(g_hEvent);}return 0;}DWORD WINAPI Fun2Proc(  LPVOID lpParameter   // thread data){while(TRUE){WaitForSingleObject(g_hEvent,INFINITE);//ResetEvent(g_hEvent);if(tickets>0){Sleep(1);cout<<"thread2 sell ticket : "<<tickets--<<endl;}elsebreak;SetEvent(g_hEvent);}return 0;}