получить количество процессоров (get number of processors)
Имя (Name)
get_nprocs, get_nprocs_conf - get number of processors
Синопсис (Synopsis)
#include <sys/sysinfo.h>
int get_nprocs(void);
int get_nprocs_conf(void);
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).
Возвращаемое значение (Return value)
As given in DESCRIPTION.
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 │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
These functions are GNU extensions.
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 */
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);
}
Смотри также (See also)
nproc(1)
