How to properly end a hovering thread inside a DLL?

Question

Hello everybody,

I have a third-party library containing an error. When I call a function, it may hang. The library function is called inside the dll. I decided to transfer the call to the stream and wait a while. If the stream is completed, then OK. If not, I have to finish it mandatory.

A simplified example here:

unsigned Counter = 0;
void f()
{
    HANDLE hThread;
    unsigned threadID;

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

    if (WAIT_TIMEOUT == WaitForSingleObject( hThread, 5000 ))
    {
        TerminateThread(hThread, 1);    
        wcout << L"Process is Timed Out";
    }
    else
    {
        wcout << L"Process is Ended OK";
    }

    CloseHandle(hThread);   

    wcout << Counter;
}

unsigned int _stdcall DoSomething( void * /*dummy*/ )
{
    while (1)
    {

        ++Counter;

    }
    _endthreadex( 0 );
    return 0;
}

Question

• The TerminateThread () function is not recommended to be called.
• As I mentioned earlier, a thread works inside a dll . If I terminate the thread using TerminateThread (), my dll will not unload using FreeLibrary () or even FreeLibraryAndExitThread (). Both functions freeze.

How to terminate a thread and keep FreeLibrary () working?

Thank.

Answer 1

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