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I think the function CancelableWait should check for timeout being negative (when casted to an int, that is). This can happen if you call pthread_cond_timedwait with an abstime that's already gone, because of some rounding error or slightly incorrect handling of various timestamp formats. It happens for instance in GLib's testgthread program. If timeout is negative, it probably should be treated as zero. In CancelableWait, before calling WaitForMultipleObjects, insert: if (((int) timeout) < 0) timeout = 0; Cheers, --tml