PTHREAD_ATTR_GETSCHEDPOLICYPOSIX Programmer's MaPTHREAD_ATTR_GETSCHEDPOLICY(P)NAME
pthread_attr_getschedpolicy, pthread_attr_setschedpolicy - get and set
the schedpolicy attribute (REALTIME THREADS)
SYNOPSIS
#include <pthread.h>
int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
int *restrict policy);
int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
DESCRIPTION
The pthread_attr_getschedpolicy() and pthread_attr_setschedpolicy()
functions, respectively, shall get and set the schedpolicy attribute in
the attr argument.
The supported values of policy shall include SCHED_FIFO, SCHED_RR, and
SCHED_OTHER, which are defined in the <sched.h> header. When threads
executing with the scheduling policy SCHED_FIFO, SCHED_RR, or
SCHED_SPORADIC are waiting on a mutex, they shall acquire the mutex in
priority order when the mutex is unlocked.
RETURN VALUE
If successful, the pthread_attr_getschedpolicy() and
pthread_attr_setschedpolicy() functions shall return zero; otherwise,
an error number shall be returned to indicate the error.
ERRORS
The pthread_attr_setschedpolicy() function may fail if:
EINVAL The value of policy is not valid.
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
These functions shall not return an error code of [EINTR].
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
After these attributes have been set, a thread can be created with the
specified attributes using pthread_create(). Using these routines does
not affect the current running thread.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOpthread_attr_destroy() , pthread_attr_getscope() , pthread_attr_get‐
inheritsched() , pthread_attr_getschedparam() , pthread_create() , the
Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 PTHREAD_ATTR_GETSCHEDPOLICY(P)
