SCHED_YIELD(2)            (2017-09-15)             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, POSIX.1-2008.

     NOTES
          If the calling thread is the only thread in the highest pri-
          ority 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() unnec-
          essarily 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.

     SEE ALSO
          sched(7)

     COLOPHON

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     SCHED_YIELD(2)            (2017-09-15)             SCHED_YIELD(2)

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