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   get_nprocs_conf    ( 3 )

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Имя (Name)

get_nprocs, get_nprocs_conf - get number of processors

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Синопсис (Synopsis)

#include <sys/sysinfo.h>

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

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Описание (Description)

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).

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Возвращаемое значение (Return value)

As given in DESCRIPTION.

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Атрибуты (Attributes)

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 │ └──────────────────────────────────────┴───────────────┴─────────┘

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Стандарты (Conforming to)

These functions are GNU extensions.

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Примечание (Note)

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 */

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Примеры (Examples)

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

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

       int
       main(int argc, char *argv[])
       {
           printf("This system has %d processors configured and "
                   "%d processors available.\n",
                   get_nprocs_conf(), get_nprocs());
           exit(EXIT_SUCCESS);
       }

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Смотри также (See also)

nproc(1)

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