PTHREAD_ATTR_GETSCOPE(3P) POSIX Programmer's Manual PTHREAD_ATTR_GETSCOPE(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_getscope, pthread_attr_setscope — get and set the con‐
tentionscope attribute (REALTIME THREADS)
int pthread_attr_getscope(const pthread_attr_t *restrict attr,
int *restrict contentionscope);
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
The pthread_attr_getscope() and pthread_attr_setscope() functions,
respectively, shall get and set the contentionscope attribute in the
The contentionscope attribute may have the values PTHREAD_SCOPE_SYSTEM,
signifying system scheduling contention scope, or
PTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope.
The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS are defined
in the <pthread.h> header.
The behavior is undefined if the value specified by the attr argument
to pthread_attr_getscope() or pthread_attr_setscope() does not refer to
an initialized thread attributes object.
If successful, the pthread_attr_getscope() and pthread_attr_setscope()
functions shall return zero; otherwise, an error number shall be
returned to indicate the error.
The pthread_attr_setscope() function shall fail if:
An attempt was made to set the attribute to an unsupported
The pthread_attr_setscope() function may fail if:
EINVAL The value of contentionscope 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_getscope() or pthread_attr_setscope() does not
refer to an initialized thread attributes object, it is recommended
that the function should fail and report an [EINVAL] error.
SEE ALSOpthread_attr_destroy(), pthread_attr_getinheritsched(),
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
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IEEE/The Open Group 2013 PTHREAD_ATTR_GETSCOPE(3P)