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sched_yield - yield the processor
sched_yield() causes the calling thread to relinquish the CPU. The
thread is moved to the end of the queue for its static priority and a
new thread gets to run.
On success, sched_yield() returns 0. On error, -1 is returned, and
errno is set appropriately.
In the Linux implementation, sched_yield() always succeeds.
If the calling thread is the only thread in the highest priority list
at that time, it 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>.
Strategic calls to sched_yield() can improve performance by giving
other threads or processes a chance to run when (heavily) contended
resources (e.g., mutexes) have been released by the caller. Avoid
calling sched_yield() unnecessarily or inappropriately (e.g., when
resources needed by other schedulable threads are still held by the
caller), since doing so will result in unnecessary context switches,
which will degrade system performance.
sched_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
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