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)