sched_yield(2) -- Linux man page
NAMEsched_yield - yield the processor
DESCRIPTIONA process can relinquish the processor voluntarily without blocking by calling sched_yield. The process will then be moved to the end of the queue for its static priority and a new process gets to run.
Note: If the current process is the only process in the highest priority list at that time, this process will continue to run after a call to sched_yield.
POSIX systems on which sched_yield is available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
RETURN VALUEOn success, sched_yield returns 0. On error, -1 is returned, and errno is set appropriately.
CONFORMING TOPOSIX.1b (formerly POSIX.4)
SEE ALSOsched_setscheduler(2) for a description of Linux scheduling.
Programming for the real world - POSIX.4
by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
IEEE Std 1003.1b-1993 (POSIX.1b standard)