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)