Condition Variables

cond_wait(lock, cond_var) Release the lock Sleep on cond_var When waken by the system, reacquire the lock and return

cond_signal(cond_var) If at least 1 thread is sleeping on cond_var, wake 1 up Otherwise, no effect

cond_broadcast(cond_var) If at least 1 thread is sleeping on cond_var, wake everyone up Otherwise, no effect

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