SCHED_YIELD(2) manual page
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sched_yield - yield the processor
#include
<sched.h>
int sched_yield(void);
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.
On success,
sched_yield() returns 0. On error, -1 is returned, and errno is set appropriately.
In the Linux implementation, sched_yield() always succeeds.
POSIX.1-2001.
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(7)
This page is part of release 3.78 of
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