get_nprocs
Section: C Library Functions (3)
Updated: 2022-12-15
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NAME
get_nprocs, get_nprocs_conf - get number of processors
LIBRARY
Standard C library
(libc, -lc)
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
|
STANDARDS
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 <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);
}
SEE ALSO
nproc(1)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- EXAMPLES
-
- SEE ALSO
-
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