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()?

Understanding the Context

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). The wait() and notify() methods are designed to provide a mechanism to allow a thread to block until a specific condition is met.

Key Insights

For this I assume you're wanting to write a blocking queue implementation, where you have some fixed size backing-store of elements. The first thing you have to do is to identify the conditions that you want the methods to wait for. In this case, you will want the ... How to wait in a bash script for several subprocesses spawned from that script to finish, and then return exit code !=0 when any of the subprocesses ends with code !=0? process - How to wait in bash for several subprocesses to finish, and ...

Final Thoughts

man wait (2) All of these system calls are used to wait for state changes in a child of the calling process, and obtain information about the child whose state has changed. A state change is considered to be: the child terminated; the child was stopped by a signal; or the child was resumed by a signal So wait() allows a process to wait until one of its child processes change its state, exists ...