Why do we have both wait() and sleep()? It then fills in the argument with the exit code of the child-process (if the argument is not null). Mean asked 10 years, modified 6 years, viewed 10k times What is the difference between a wait() and sleep() in threads? How does their implementation vary at a lower level? What does wait $! Is my understanding that a wait() -ing thread is still in running mode and uses cpu cycles but a sleep() -ing does not consume any cpu cycles correct? · difference between wait and sleep asked 13 years, modified 6 years, viewed 585k times I am getting a warning > implicit declaration of function ‘wait’ < and when i run the program it works correctly, i would like to understand why i am getting this warning? · the wait system-call puts the process to sleep and waits for a child-process to end. Thanks in advance ed.

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