pthread_testcancel - request delivery of any pending cancellation request
Compile and link with -pthread.
Calling pthread_testcancel() creates a cancellation point within the calling thread, so that a thread that is otherwise executing code that contains no cancellation points will respond to a cancellation request.
This function does not return a value. If the calling thread is canceled as a consequence of a call to this function, then the function does not return.
This function always succeeds.
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