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+'\" t
+.\" Copyright (c) 2012, Petr Benas
+.\" and Copyright (c) 2012, Michael Kerrisk <mtk.man-pages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH get_nprocs 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+get_nprocs, get_nprocs_conf \- get number of processors
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <sys/sysinfo.h>
+.P
+.B int get_nprocs(void);
+.B int get_nprocs_conf(void);
+.fi
+.SH DESCRIPTION
+The function
+.BR get_nprocs_conf ()
+returns the number of processors configured by the operating system.
+.P
+The function
+.BR get_nprocs ()
+returns the number of processors currently available in the system.
+This may be less than the number returned by
+.BR get_nprocs_conf ()
+because processors may be offline (e.g., on hotpluggable systems).
+.SH RETURN VALUE
+As given in DESCRIPTION.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR get_nprocs (),
+.BR get_nprocs_conf ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+GNU.
+.SH NOTES
+The current
+.\" glibc 2.15
+implementation of these functions is rather expensive,
+since they open and parse files in the
+.I /sys
+filesystem each time they are called.
+.P
+The following
+.BR sysconf (3)
+calls make use of the functions documented on this page
+to return the same information.
+.P
+.in +4n
+.EX
+np = sysconf(_SC_NPROCESSORS_CONF);     /* processors configured */
+np = sysconf(_SC_NPROCESSORS_ONLN);     /* processors available */
+.EE
+.in
+.SH EXAMPLES
+The following example shows how
+.BR get_nprocs ()
+and
+.BR get_nprocs_conf ()
+can be used.
+.P
+.\" SRC BEGIN (get_nprocs_conf.c)
+.EX
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/sysinfo.h>
+\&
+int
+main(void)
+{
+    printf("This system has %d processors configured and "
+            "%d processors available.\en",
+            get_nprocs_conf(), get_nprocs());
+    exit(EXIT_SUCCESS);
+}
+.EE
+.\" SRC END
+.SH SEE ALSO
+.BR nproc (1)