SCHED_YIELDSection: Linux Programmer's Manual (2)
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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.
ERRORSIn the Linux implementation, sched_yield() always succeeds.
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