sched_yield(2) — Linux manual page


SCHED_YIELD(2)          Linux Programmer's Manual         SCHED_YIELD(2)

NAME         top

       sched_yield - yield the processor

SYNOPSIS         top

       #include <sched.h>

       int sched_yield(void);

DESCRIPTION         top

       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         top

       On success, sched_yield() returns 0.  On error, -1 is returned,
       and errno is set to indicate the error.

ERRORS         top

       In the Linux implementation, sched_yield() always succeeds.

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

NOTES         top

       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

       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

       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

SEE ALSO         top


COLOPHON         top

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Linux                          2021-03-22                 SCHED_YIELD(2)

Pages that refer to this page: getrlimit(2)sched_setattr(2)sched_setscheduler(2)syscalls(2)pthread_yield(3)sched(7)