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SCHED_YIELD(2) Linux Programmer's Manual SCHED_YIELD(2)
sched_yield - yield the processor
#include <sched.h>
int sched_yield(void);
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.
POSIX.1-2001.
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
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2008-10-18 SCHED_YIELD(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface