sched_yield - yield the processor
() 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
On success, sched_yield
() returns 0. On error, -1 is returned, and
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
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.
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.
This page is part of release 3.44 of the Linux man-pages
description of the project, and information about reporting bugs, can be found