sched_yield - yield the processor
A 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 con
tinue to run after a call to sched_yield.
POSIX systems on which sched_yield is available define
_POSIX_PRIORITY_SCHEDULING in <unistd.h>.
On success, sched_yield returns 0. On error, -1 is
returned, and errno is set appropriately.
POSIX.1b (formerly POSIX.4)
sched_setscheduler(2) for a description of Linux schedul
Programming for the real world - POSIX.4 by Bill O.
Gallmeister, O'Reilly & Associates, Inc., ISBN
IEEE Std 1003.1b-1993 (POSIX.1b standard)