NAME¶

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);

Compile and link with -pthread.

DESCRIPTION¶

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 inspect CPU sets, see CPU_SET(3).

RETURN VALUE¶

ERRORS¶

EINVAL

(pthread_attr_setaffinity_np()) cpuset specified a CPU that was outside the set supported by the kernel. (The kernel configuration option CONFIG_NR_CPUS defines the range of the set supported 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.

VERSIONS¶

ATTRIBUTES¶

CONFORMING TO¶

NOTES¶

SEE ALSO¶

COLOPHON¶