Unix/Linux Go Back    


CentOS 7.0 - man page for sched_yield (centos section 2)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


SCHED_YIELD(2)			    Linux Programmer's Manual			   SCHED_YIELD(2)

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 appropri-
       ately.

ERRORS
       In the Linux implementation, sched_yield() 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 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 pro-
       cesses 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 per-
       formance.

SEE ALSO
       sched_setscheduler(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
       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2008-10-18				   SCHED_YIELD(2)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 03:16 PM.