c++ - 如何获得 Windows 线程的返回值？

Question

我只是想知道是否有可能(如果有，如何)在 C++ (Windows) 中获取线程的返回值。我有几个线程，我对它们使用 WaitForMultipleObjects(...)。这会等待一个线程完成，并返回所述线程的索引，一切都很好。但是，我希望能够获得结束使用其句柄的线程的返回值。

例如:

DWORD WINAPI Thread1(void *parameter){
    ...
    if(...) return 0;
    else return -1;
}

DWORD WINAPI Thread2(void *parameter){
    ...
    if(...) return 1;
    else return 0;
}

int main(){
    HANDLE t1 = CreateThread(0, 0, Thread1, NULL, 0, 0);
    HANDLE t2 = CreateThread(0, 0, Thread2, NULL, 0, 0);
    HANDLE *threads = new HANDLE[2];
    threads[0] = t1;
    threads[1] = t2;
    int result = WaitForMultipleObjects(2, threads, false, INFINITE);
    if(result == 0){
        //get the threads value here:
        int retVal = SomeFunction(t1); //What is SomeFunction?
    }
    ...
}

我曾尝试使用 GetExitCodeThread(thread) 但我假设这会返回一个系统退出代码，因为它总是给我一个非常奇怪的整数。有谁知道一种方法或解决方法？

Answer 1

GetExitCodeThread是正确的功能。这是它的作用的 MSDN 描述:

This function returns immediately. If the specified thread has not terminated and the function succeeds, the status returned is STILL_ACTIVE. If the thread has terminated and the function succeeds, the status returned is one of the following values:

• The exit value specified in the ExitThread or TerminateThread function.
• The return value from the thread function.
• The exit value of the thread's process.