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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, POSIX.1-2008.
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_yield() is intended for use with real-time scheduling
policies (i.e., SCHED_FIFO or SCHED_RR). Use of sched_yield()
with nondeterministic scheduling policies such as SCHED_OTHER is
unspecified and very likely means your application design is
broken.
sched(7)
This page is part of release 5.10 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SCHED_YIELD(2)
Pages that refer to this page: getrlimit(2), sched_setattr(2), sched_setscheduler(2), syscalls(2), pthread_yield(3), sched(7)
Copyright and license for this manual page
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