NAME
schedyield - yield the processor SYNOPSIS
#include
int schedyield(void); DESCRIPTION schedyield() 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, schedyield() returns 0. On error, -1 is returned, and errno is set appropriately. ERRORS In the Linux implementation, schedyield() always succeeds. CONFORMING TO
POSIX.1-2001. 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 schedyield(). POSIX systems on which schedyield() is available define POSIXPRIOR‐ ITYSCHEDULING in
. Strategic calls to schedyield() 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 schedyield() 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 schedsetscheduler(2) for a description of Linux scheduling Programming for the real world - POSIX.4 by Bill O. Gallmeister,
O'Reilly & Associates, Inc., ISBN 1-56592-074-0. COLOPHON
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Linux 2008-10-18 SCHEDYIELD(2)