本文實(shí)例講述了C++使用CriticalSection實(shí)現(xiàn)線程同步的方法,在前文C++線程同步實(shí)例分析的基礎(chǔ)上增加了四行代碼,使用了四個(gè)函數(shù):
EnterCriticalSection ::DeleteCriticalSection ::EnterCriticalSection ::LeaveCriticalSection此時(shí),打印出來的數(shù)字就相等了。
具體代碼如下:
- #include "stdafx.h"
- #include <Windows.h>
- DWORD g_cnt1;
- DWORD g_cnt2;
- BOOL g_bContinue = TRUE;
- CRITICAL_SECTION cs;
- DWORD WINAPI ThreadProc(__in LPVOID lpParameter)
- {
- ::EnterCriticalSection(&cs);
- while(g_bContinue)
- {
- g_cnt1++;
- g_cnt2++;
- }
- ::LeaveCriticalSection(&cs);
- return 0;
- }
- int _tmain(int argc, _TCHAR* argv[])
- {
- HANDLE hThread[2];
- g_cnt1 = g_cnt2 = 0;
- ::InitializeCriticalSection(&cs);
- hThread[0] = ::CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
- hThread[1] = ::CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
- Sleep(1000);
- g_bContinue = FALSE;
- ::WaitForMultipleObjects(2, hThread, TRUE, INFINITE);
- printf("g_cnt1=%d/n",g_cnt1);
- printf("g_cnt2=%d/n",g_cnt2);
- ::DeleteCriticalSection(&cs);
- ::CloseHandle(hThread[0]);
- ::CloseHandle(hThread[1]);
- return 0;
- }
希望本文所述對大家的C++程序設(shè)計(jì)有所幫助。
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