WaitForMultipleObjects: How to asynchronously wait?

"Daneel" <michael.ransburg@gmail.com>
11 Feb 2007 06:34:31 -0800

I'm using WaitForMultipleObjects to wait for three threads to finish.

CWinThread* thread1 = AfxBeginThread(foo,NULL,THREAD_PRIORITY_NORMAL,
CWinThread* thread2 = AfxBeginThread(bar,NULL,THREAD_PRIORITY_NORMAL,
CWinThread* thread3 =

HANDLE h[] = {thread1->m_hThread,thread2->m_hThread,thread3-


I want to wait for all of them. However, as some thread might take
longer than the others, I want to get notified immediately if one of
the threads finishes in order to update the GUI:

for (i = 0; i < 3; i++) {
    WaitForMultipleObjects(3, h, FALSE, INFINITE);
    // do something

The problem is that as soon as one of the threads is finished, the for
loop executes all three times without WaitForMultipleObjects waiting
for the remaining 2 threads.

What am I doing wrong? Do I have to remove the handle for the thread
which is finished from the HANDLE array before calling
WaitForMultipleObjects again? How can I do that?

Many thanks,

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