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If I terminate a thread on Windows using the TerminateThread function, is that thread actually terminated once the function returns or is termination asychnronous?
Define “actually terminated”. The documentation says the thread can not execute any more user-mode code, so effectively: yes, it is terminated, nothing of your code is going to be executed by that thread any more.
If you “WaitForSingleObject” on it right after terminating, I guess there could still be some slight delay because of cleanup that Windows is doing.
By the way: TerminateThread is the worst way of ending a thread. Try using some other means of synchronization, like a global variable that tells the thread to stop, or an event for example.