x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SCHED_YIELD(2) Linux Programmer's Manual SCHED_YIELD(2)
NAME
sched_yield - yield the processor
SYNOPSIS
#include <sched.h>
int sched_yield(void);
DESCRIPTION
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.
RETURN VALUE
On success, sched_yield() returns 0. On error, -1 is returned, and
errno is set appropriately.
ERRORS
In the Linux implementation, sched_yield() always succeeds.
CONFORMING TO
POSIX.1-2001.
NOTES
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_PRIOR-
ITY_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.
SEE ALSO
sched(7)
COLOPHON
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Linux 2014-04-28 SCHED_YIELD(2)
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