让主线程阻塞以等待子线程完成的方法

最新推荐文章于 2021-08-29 21:43:39 发布

原创最新推荐文章于 2021-08-29 21:43:39 发布 · 3.6k 阅读

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本文通过示例代码展示了如何使用_beginthreadex创建线程，并利用WaitForSingleObject进行线程间的同步等待，确保主线程在次线程结束后继续运行。

MSDN:

The following sample code demonstrates how you can use the thread handle returned by _beginthreadex with the synchronization API WaitForSingleObject. The main thread waits for the second thread to terminate before it continues. When the second thread calls _endthreadex , it causes its thread object to go to the signaled state. This allows the primary thread to continue running. This cannot be done with _beginthread and _endthread , because _endthread calls CloseHandle , destroying the thread object before it can be set to the signaled state.

示例代码：

#include "stdafx.h"
#include "windows.h"
#include "process.h"
#include <iostream>
using namespace std;

unsigned _stdcall ThreadDo(void*)
{
    int nSum = 0;
    for(int i=0; i<100; ++i)
    {
        cout<<"the number is "<<i<<endl;
        nSum+=i;
    }
    _endthreadex(0);
    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    unsigned threadID;
    HANDLE hThread = (HANDLE)_beginthreadex(NULL, 0, ThreadDo, NULL, CREATE_SUSPENDED, &threadID);
    ResumeThread(hThread);
    WaitForSingleObject(hThread, INFINITE);//让主线程阻塞

    cout<<"main thread get running"<<endl;
    CloseHandle(hThread);

    return 0;
}