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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 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 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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