What is the difference between a wait() and sleep() in Threads? 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? Why do we have both wait() and sleep()? How does their implementation vary at a lower level?
Difference between "wait ()" vs "sleep ()" in Java - Stack Overflow
The wait system-call puts the process to sleep and waits for a child-process to end. It then fills in the argument with the exit code of the child-process (if the argument is not NULL).
What is difference between wait and sleep? Note that sleep and wait can be very powerful in conjunction, if you want your bash script to wait until it receives a signal. The following script will stop waiting for the sleep to finish if it receives one of the trapped signals. With just the sleep alone, the signal wouldn't be encountered until the sleep has finished.
Quoting wait/waitpid, The waitpid () function is provided for three reasons: To support job control To permit a non-blocking version of the wait () function To permit a library routine, such as system () or pclose (), to wait for its children without interfering with other terminated children for which the process has not waited and The waitpid () function shall be equivalent to wait () if the ...