要不要调用_endthreadex

[hxyman]

http://msdn.microsoft.com/en-us/library/kdzttdcb(VS.80).aspx

You can call _endthread or _endthreadex explicitly to terminate a thread; however, _endthread or _endthreadex is called automatically when the thread returns from the routine passed as a parameter. Terminating a thread with a call to endthread or _endthreadex helps to ensure proper recovery of resources allocated for the thread.

这里说函数返回时会自动调用，但是后面举的例子里全部手动调用了 _endthreadex

....
unsigned Counter;
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
printf( "In second thread...\n" );

while ( Counter < 1000000 )
Counter++;

_endthreadex( 0 );
return 0;
}
....

WHY???

[dong364]

建议让线程自然结束, 不需要调用_endthreadex( nRet );

[珍惜生命远离CPP]

那就调用2次了.

[bdzwj]

不用

[dch4890164]

return 0;
跟踪一下，这句能否被执行
如果不能被执行，就说明本来操作系统要做的事情让你给做了，资源立刻就被回收了
而操作系统不会再次调用_endthreadex
只是一种猜想，还没有研究这么深

[hxyman]

[Quote=引用 3 楼 dch4890164 的回复:]
return 0;
跟踪一下，这句能否被执行
如果不能被执行，就说明本来操作系统要做的事情让你给做了，资源立刻就被回收了
而操作系统不会再次调用_endthreadex
只是一种猜想，还没有研究这么深
[/Quote]

如你所说，_endthreadex后面的没有执行。明白了。谢谢楼上各位。

附测试代码（MFC）
---------------------------
unsigned Counter;
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
::AfxMessageBox( "In second thread...\n" );

while ( Counter < 1000000 )
Counter++;

_endthreadex( 0 );
::AfxMessageBox("After _endthreadex( 0 )");
return 0;
};

void CtestendDlg::OnBnClickedOk()
{
//OnOK();
HANDLE hThread;
unsigned threadID;

::AfxMessageBox( "Creating second thread...\n" );

// Create the second thread.
hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, &threadID );

// Wait until second thread terminates. If you comment out the line
// below, Counter will not be correct because the thread has not
// terminated, and Counter most likely has not been incremented to
// 1000000 yet.
WaitForSingleObject( hThread, INFINITE );
::AfxMessageBox( "Counter should be 1000000; it is-> %d\n", Counter );
// Destroy the thread object.
CloseHandle( hThread );

}