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cmultithreadingwhile-loopnonblocking

A generic CPU non blocking way to handle while loop in C

I would ask a very generic question that has been perplexing me for some time. Very, very often we have to wait for the results from non-blocking functions, for example bytes to read from a file, socket or device.

Why waste the godsend of non-blocking functions for a blocking while?

So, is it possible, at least in POSIX API, to do a sort of while(!somethingToRead()) forceToPassToNextJobInScheduler();?

I can't find information about this anywhere, and it would be beautiful to limit the use of threads.

The fact that I have not found anything suggests to me that either I have not used the right keywords or that nothing similar is possible. But it would be wonderful, I hope.

Solution

  • I finally found the answer to the question thanks the researcher behind libvpoll: the exactly function that I'm talking about with 'forceToPassToNextJobInScheduler' is sched_yield(): https://man7.org/linux/man-pages/man2/sched_yield.2.html

    I'm pretty gone near to the solution, having open a tab aboust sched functions: https://man7.org/linux/man-pages/man7/sched.7.html But as not a low-level POSIX expert, it's difficult to find easily the right solution.