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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 to indicate the error.

ERRORS
       In the Linux implementation, sched_yield() always succeeds.

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

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_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 poli‐
       cies such as SCHED_OTHER is unspecified and very likely means your application design is broken.

SEE ALSO
       sched(7)

Linux                                                                          2021-03-22                                                                 SCHED_YIELD(2)