Section: POSIX Programmer's Manual (3P)
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.
--- get and set the contentionscope attribute
int pthread_attr_getscope(const pthread_attr_t *restrict attr,
int *restrict contentionscope);
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
functions, respectively, shall get and set the
attribute in the
attribute may have the values PTHREAD_SCOPE_SYSTEM,
signifying system scheduling contention scope, or
signifying process scheduling contention scope. The symbols
PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS are defined in the
The behavior is undefined if the value specified by the
does not refer to an initialized thread attributes object.
If successful, the
functions shall return zero; otherwise, an error number shall be
returned to indicate the error.
function shall fail if:
An attempt was made to set the attribute to an unsupported value.
function may fail if:
The value of
is not valid.
These functions shall not return an error code of
The following sections are informative.
After these attributes have been set, a thread can be created with the
specified attributes using
Using these routines does not affect the current running thread.
Section 2.9.4, Thread Scheduling
for further details on thread scheduling attributes and their default
If an implementation detects that the value specified by the
does not refer to an initialized thread attributes object, it is
recommended that the function should fail and report an
The Base Definitions volume of POSIX.1-2017,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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
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