Manpages - get_nprocs_conf.3
Table of Contents
NAME
get_nprocs, get_nprocs_conf - get number of processors
SYNOPSIS
#include <sys/sysinfo.h> int get_nprocs(void); int get_nprocs_conf(void);
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).
RETURN VALUE
As given in DESCRIPTION.
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 |
CONFORMING TO
These functions are GNU extensions.
NOTES
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 */
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); }
SEE ALSO
*nproc*(1)
COLOPHON
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