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3 .\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
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25 .\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
26 .\" First version written
27 .\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
30 .TH SCHED_YIELD 2 2008-10-18 "Linux" "Linux Programmer's Manual"
32 sched_yield \- yield the processor
36 .B int sched_yield(void);
39 causes the calling thread to relinquish the CPU.
40 The thread is moved to the end of the queue for its static
41 priority and a new thread gets to run.
46 On error, \-1 is returned, and
50 In the Linux implementation,
56 If the calling thread is the only thread in the highest
57 priority list at that time,
58 it will continue to run after a call to
61 POSIX systems on which
64 .B _POSIX_PRIORITY_SCHEDULING
69 can improve performance by giving other threads or processes
70 a chance to run when (heavily) contended resources (e.g., mutexes)
71 have been released by the caller.
74 unnecessarily or inappropriately
75 (e.g., when resources needed by other
76 schedulable threads are still held by the caller),
77 since doing so will result in unnecessary context switches,
78 which will degrade system performance.
80 .BR sched_setscheduler (2)
81 for a description of Linux scheduling.
83 .I Programming for the real world \- POSIX.4
84 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0