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-'\" t
-.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH pthread_attr_setaffinity_np 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-pthread_attr_setaffinity_np, pthread_attr_getaffinity_np \- set/get
-CPU affinity attribute in thread attributes object
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
-.B #include <pthread.h>
-.P
-.BI "int pthread_attr_setaffinity_np(pthread_attr_t *" attr ,
-.BI " size_t " cpusetsize ", const cpu_set_t *" cpuset );
-.BI "int pthread_attr_getaffinity_np(const pthread_attr_t *" attr ,
-.BI " size_t " cpusetsize ", cpu_set_t *" cpuset );
-.fi
-.SH DESCRIPTION
-The
-.BR pthread_attr_setaffinity_np ()
-function
-sets the CPU affinity mask attribute of the
-thread attributes object referred to by
-.I attr
-to the value specified in
-.IR cpuset .
-This attribute determines the CPU affinity mask
-of a thread created using the thread attributes object
-.IR attr .
-.P
-The
-.BR pthread_attr_getaffinity_np ()
-function
-returns the CPU affinity mask attribute of the thread attributes object
-referred to by
-.I attr
-in the buffer pointed to by
-.IR cpuset .
-.P
-The argument
-.I cpusetsize
-is the length (in bytes) of the buffer pointed to by
-.IR cpuset .
-Typically, this argument would be specified as
-.IR sizeof(cpu_set_t) .
-.P
-For more details on CPU affinity masks, see
-.BR sched_setaffinity (2).
-For a description of a set of macros
-that can be used to manipulate and inspect CPU sets, see
-.BR CPU_SET (3).
-.SH RETURN VALUE
-On success, these functions return 0;
-on error, they return a nonzero error number.
-.SH ERRORS
-.TP
-.B EINVAL
-.RB ( pthread_attr_setaffinity_np ())
-.I cpuset
-specified a CPU that was outside the set supported by the kernel.
-(The kernel configuration option
-.B CONFIG_NR_CPUS
-defines the range of the set supported by the kernel data type
-.\" cpumask_t
-used to represent CPU sets.)
-.\" The raw sched_getaffinity() system call returns the size (in bytes)
-.\" of the cpumask_t type.
-.TP
-.B EINVAL
-.RB ( pthread_attr_getaffinity_np ())
-A CPU in the affinity mask of the thread attributes object referred to by
-.I attr
-lies outside the range specified by
-.I cpusetsize
-(i.e.,
-.IR cpuset / cpusetsize
-is too small).
-.TP
-.B ENOMEM
-.RB ( pthread_attr_setaffinity_np ())
-Could not allocate memory.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR pthread_attr_setaffinity_np (),
-.BR pthread_attr_getaffinity_np ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-GNU;
-hence the suffix "_np" (nonportable) in the names.
-.SH HISTORY
-glibc 2.3.4.
-.SH NOTES
-In glibc 2.3.3 only,
-versions of these functions were provided that did not have a
-.I cpusetsize
-argument.
-Instead the CPU set size given to the underlying system calls was always
-.IR sizeof(cpu_set_t) .
-.SH SEE ALSO
-.BR sched_setaffinity (2),
-.BR pthread_attr_init (3),
-.BR pthread_setaffinity_np (3),
-.BR cpuset (7),
-.BR pthreads (7)