x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
pthread_attr_setaffinity_npLibrary Functions Manpthread_attr_setaffinity_np(3)
NAME
pthread_attr_setaffinity_np, pthread_attr_getaffinity_np - set/get CPU
affinity attribute in thread attributes object
LIBRARY
POSIX threads library (libpthread, -lpthread)
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <pthread.h>
int pthread_attr_setaffinity_np(pthread_attr_t *attr,
size_t cpusetsize, const cpu_set_t *cpuset);
int pthread_attr_getaffinity_np(const pthread_attr_t *attr,
size_t cpusetsize, cpu_set_t *cpuset);
DESCRIPTION
The pthread_attr_setaffinity_np() function sets the CPU affinity mask
attribute of the thread attributes object referred to by attr to the
value specified in cpuset. This attribute determines the CPU affinity
mask of a thread created using the thread attributes object attr.
The pthread_attr_getaffinity_np() function returns the CPU affinity
mask attribute of the thread attributes object referred to by attr in
the buffer pointed to by cpuset.
The argument cpusetsize is the length (in bytes) of the buffer pointed
to by cpuset. Typically, this argument would be specified as
sizeof(cpu_set_t).
For more details on CPU affinity masks, see sched_setaffinity(2). For
a description of a set of macros that can be used to manipulate and in-
spect CPU sets, see CPU_SET(3).
RETURN VALUE
On success, these functions return 0; on error, they return a nonzero
error number.
ERRORS
EINVAL (pthread_attr_setaffinity_np()) cpuset specified a CPU that was
outside the set supported by the kernel. (The kernel configura-
tion option CONFIG_NR_CPUS defines the range of the set sup-
ported by the kernel data type used to represent CPU sets.)
EINVAL (pthread_attr_getaffinity_np()) A CPU in the affinity mask of
the thread attributes object referred to by attr lies outside
the range specified by cpusetsize (i.e., cpuset/cpusetsize is
too small).
ENOMEM (pthread_attr_setaffinity_np()) Could not allocate memory.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
+--------------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------------------------------+---------------+---------+
|pthread_attr_setaffinity_np(), | Thread safety | MT-Safe |
|pthread_attr_getaffinity_np() | | |
+--------------------------------------------+---------------+---------+
STANDARDS
GNU; hence the suffix "_np" (nonportable) in the names.
HISTORY
glibc 2.3.4.
NOTES
In glibc 2.3.3 only, versions of these functions were provided that did
not have a cpusetsize argument. Instead the CPU set size given to the
underlying system calls was always sizeof(cpu_set_t).
SEE ALSO
sched_setaffinity(2), pthread_attr_init(3), pthread_setaffinity_np(3),
cpuset(7), pthreads(7)
Linux man-pages 6.04 2023-03-30 pthread_attr_setaffinity_np(3)
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