The unlock-and-block part of cond_wait() is atomic; hence, by the time another thread acquires the lock, this first thread is guaranteed to be in a waiting state.

Spurious signals cannot cause a deadlock either — the test condition is lock-protected and can only proceed when other thread has entered cond_wait() (with the cond variable set to the satisfaction of the first thread).

In reply to Re^11: Threads sharing global variable by Anonymous Monk
in thread Threads sharing global variable by Anonymous Monk

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