使用CriticalSection进行线程同步
使用CriticalSection进行线程同步,在上个例子的基础上增加了四行代码,使用了四个函数:EnterCriticalSection::DeleteCriticalSection::EnterCriticalSection::LeaveCriticalSection此时,打印出来的数字就相等了……
#include "stdafx.h"
#include <Windows.h>
DWORD g_cnt1;
DWORD g_cnt2;
BOOL g_bContinue = TRUE;
CRITICAL_SECTION cs;
DWORD WINAPI ThreadProc(__inLPVOID lpParameter)
{
::EnterCriticalSection(&cs);
while(g_bContinue)
{
g_cnt1++;
g_cnt2++;
}
::LeaveCriticalSection(&cs);
return 0;
}
int _tmain(int argc, _TCHAR* argv[])
{
HANDLE hThread;
g_cnt1 = g_cnt2 = 0;
::InitializeCriticalSection(&cs);
hThread = ::CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
hThread = ::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);
::CloseHandle(hThread);
return 0;
}
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