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sched_yield - yield the processor
Contents
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.
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.
Errors
In the Linux implementation, sched_yield() always succeeds.
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>.
Library
Standard C library (libc, -lc)
Name
sched_yield - yield the processor
Return Value
On success, sched_yield() returns 0. On error, -1 is returned, and errno is set to indicate the error.
See Also
sched(7)
Linux man-pages 6.9.1 2024-05-02 sched_yield(2)
Standards
POSIX.1-2008.
Synopsis
#include<sched.h>intsched_yield(void);
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