Windows线程（六）使用事件机制解决线程同步问题

1.创建事件：CreateEvent
HANDLE CreateEvent
(
LPSECURITY_ATTRIBUTES lpEventAttributes,
BOOL bManualReset,
BOOL bInitialState,
LPCTSTR lpName
);
2.根据时间名称获得事件句柄：OpenEvent
HANDLE OpenEvent
(
DWORD dwDesiredAccess,
BOOL bInheritHandle,
LPCTSTR lpName
);
3.触发事件：SetEvent
BOOL SetEvent(HANDLE hEvent);
4.将事件设置为未触发：ResetEvent
BOOL ResetEvent(HANDLE hEvent);
5.将被触发后的事件立即设置为未触发：PulseEvent
BOOL PulseEvent(HANDLE hEvent);

#include <stdio.h>
#include <process.h>
#include <Windows.h>

#define THREAD_NUM 10

unsigned long g_nNum;
//事件与关键段
HANDLE g_hThreadEvent;
CRITICAL_SECTION g_csThreadCode;

unsigned int __stdcall ThreadFun(void *pM)
{
int nThreadNum = *(int *)pM;

//触发事件
SetEvent(g_hThreadEvent);
Sleep(50);

EnterCriticalSection(&g_csThreadCode);
g_nNum++;

Sleep(0);
printf("线程编号为%d 全局资源值为%d\n", nThreadNum, g_nNum);

LeaveCriticalSection(&g_csThreadCode);
return 0;
}

int main()
{
int i = 0;
HANDLE handle[THREAD_NUM];
printf("--------------------经典线程同步之事件--------------------\n");

//初始化事件和关键段， 自动置位，初始化无触发的匿名事件
g_hThreadEvent = CreateEvent(NULL, 0, 0, NULL);
InitializeCriticalSection(&g_csThreadCode);
g_nNum = 0;

while(i < THREAD_NUM)
{
handle[i] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun, &i, 0, NULL);
//等待事件被触发
WaitForSingleObject(g_hThreadEvent, INFINITE);
i++;
}

WaitForMultipleObjects(THREAD_NUM, handle, 1, INFINITE);

//销毁事件和关键段
CloseHandle(g_hThreadEvent);
DeleteCriticalSection(&g_csThreadCode);

system("pause");

return 0;
}