The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> sched_yield - yield the processor

#### SYNOPSIS

> ``#include <sched.h>
> int sched_yield(void);
> ``

#### DESCRIPTION

> The sched_yield() function shall force the running thread to relinquish the processor until it again becomes the head of its thread list. It takes no arguments.

#### RETURN VALUE

> The sched_yield() function shall return 0 if it completes successfully; otherwise, it shall return a value of -1 and set errno to indicate the error.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> The conceptual model for scheduling semantics in POSIX.1-2008 defines a set of thread lists. This set of thread lists is always present regardless of the scheduling options supported by the system. On a system where the Process Scheduling option is not supported, portable applications should not make any assumptions regarding whether threads from other processes will be on the same thread list.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> XBD <sched.h>

#### CHANGE HISTORY

> First released in Issue 5. Included for alignment with the POSIX Realtime Extension and the POSIX Threads Extension.

#### Issue 6

> The sched_yield() function is now marked as part of the Process Scheduling and Threads options.

#### Issue 7

> SD5-XSH-ERN-120 is applied, adding APPLICATION USAGE.

> The sched_yield() function is moved to the Base.

End of informative text.

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