What are trade offs for “busy wait” vs “sleep”?

Question

This is an extension to my previous question

How does blocking mode in unix/linux sockets works?

What I gather from Internet now, all the process invoking bl

Answer 1

If in the use case of your application, context switching would be more expensive than eating a few CPU cycles because your condition would be guaranteed to get satisfied within a short time, then busy waiting may be good for you.

Otherwise, you can forcefully relinquish the CPU by sleeping or cond_wait()ing.

Another scenario that I can think of for forceful context switching out is as follows:

while(condition)
    sleep(0);