PTHREAD_ATTR_GETINHERITSCHEPOSIX Programmer's PTHREAD_ATTR_GETINHERITSCHED(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
pthread_attr_getinheritsched, pthread_attr_setinheritsched — get and
set the inheritsched attribute (REALTIME THREADS)
int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
int *restrict inheritsched);
int pthread_attr_setinheritsched(pthread_attr_t *attr,
The pthread_attr_getinheritsched() and pthread_attr_setinheritsched()
functions, respectively, shall get and set the inheritsched attribute
in the attr argument.
When the attributes objects are used by pthread_create(), the inher‐
itsched attribute determines how the other scheduling attributes of the
created thread shall be set.
The supported values of inheritsched shall be:
Specifies that the thread scheduling attributes shall be inher‐
ited from the creating thread, and the scheduling attributes in
this attr argument shall be ignored.
Specifies that the thread scheduling attributes shall be set to
the corresponding values from this attributes object.
The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are
defined in the <pthread.h> header.
The following thread scheduling attributes defined by POSIX.1‐2008 are
affected by the inheritsched attribute: scheduling policy (schedpol‐
icy), scheduling parameters (schedparam), and scheduling contention
The behavior is undefined if the value specified by the attr argument
to pthread_attr_getinheritsched() or pthread_attr_setinheritsched()
does not refer to an initialized thread attributes object.
If successful, the pthread_attr_getinheritsched() and pthread_attr_set‐
inheritsched() functions shall return zero; otherwise, an error number
shall be returned to indicate the error.
The pthread_attr_setinheritsched() function shall fail if:
An attempt was made to set the attribute to an unsupported
The pthread_attr_setinheritsched() function may fail if:
EINVAL The value of inheritsched is not valid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
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.
See Section 2.9.4, Thread Scheduling for further details on thread
scheduling attributes and their default settings.
If an implementation detects that the value specified by the attr argu‐
ment to pthread_attr_getinheritsched() or pthread_attr_setinher‐
itsched() does not refer to an initialized thread attributes object, it
is recommended that the function should fail and report an [EINVAL]
SEE ALSOpthread_attr_destroy(), pthread_attr_getscope(), pthread_attr_getsched‐
policy(), pthread_attr_getschedparam(), pthread_create()
The Base Definitions volume of POSIX.1‐2008, <pthread.h>, <sched.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the source
files to man page format. To report such errors, see https://www.ker‐
IEEE/The Open Group 2013 PTHREAD_ATTR_GETINHERITSCHED(3P)