sched_yield(2)                System Calls Manual               sched_yield(2)

NAME
       sched_yield - yield the processor

LIBRARY
       Standard C library (libc, -lc)

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.

STANDARDS
       POSIX.1-2008.

HISTORY
       POSIX.1-2001 (but optional).  POSIX.1-2008.

       Before POSIX.1-2008, systems on which sched_yield() is available
       defined _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

CAVEATS
       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.

       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().

       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)

Linux man-pages 6.7               2023-10-31                    sched_yield(2)