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Linux 2.6 - man page for get_nprocs (linux section 3)

GET_NPROCS(3)						     Linux Programmer's Manual						     GET_NPROCS(3)

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(), | Thread safety | MT-Safe | |get_nprocs_conf() | | | +------------------+---------------+---------+
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 */
EXAMPLE
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)
GNU
2019-03-06 GET_NPROCS(3)

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