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.
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.