get_nprocs(3) — Справочная страница Linux

get_nprocs(3)           Library Functions Manual           get_nprocs(3)

ИМЯ

       get_nprocs, get_nprocs_conf - get number of processors

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <sys/sysinfo.h>

       int get_nprocs(void);
       int get_nprocs_conf(void);

ОПИСАНИЕ

       The function get_nprocs_conf() returns the number of processors
       configured by the operating system.

       The function get_nprocs() returns the number of processors
       currently available in the system.  This may be less than the
       number returned by get_nprocs_conf() because processors may be
       offline (e.g., on hotpluggable systems).

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       As given in DESCRIPTION.

АТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ get_nprocs(), get_nprocs_conf()     │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

СТАНДАРТЫ

       GNU.

ПРИМЕЧАНИЯ

       The current implementation of these functions is rather
       expensive, since they open and parse files in the /sys filesystem
       each time they are called.

       The following sysconf(3) calls make use of the functions
       documented on this page to return the same information.

           np = sysconf(_SC_NPROCESSORS_CONF);     /* processors configured */
           np = sysconf(_SC_NPROCESSORS_ONLN);     /* processors available */

ПРИМЕРЫ

       The following example shows how get_nprocs() and
       get_nprocs_conf() can be used.

       #include <stdio.h>
       #include <stdlib.h>
       #include <sys/sysinfo.h>

       int
       main(void)
       {
           printf("This system has %d processors configured and "
                   "%d processors available.\n",
                   get_nprocs_conf(), get_nprocs());
           exit(EXIT_SUCCESS);
       }

СМОТРИТЕ ТАКЖЕ

       nproc(1)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-06-15                  get_nprocs(3)

Страницы, которые ссылаются на эту страницу: sched_setaffinity(2), sysconf(3)