d4f3d290f4fafdd143fe642942e890402b611257
[awesomized/libmemcached] / m4 / ax_count_cpus.m4
1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_COUNT_CPUS
8 #
9 # DESCRIPTION
10 #
11 # Attempt to count the number of processors present on the machine. If the
12 # detection fails, then a value of 1 is assumed.
13 #
14 # The value is placed in the CPU_COUNT variable.
15 #
16 # LICENSE
17 #
18 # Copyright (c) 2012 Brian Aker <brian@tangent.org>
19 # Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
20 # Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
21 #
22 # Copying and distribution of this file, with or without modification, are
23 # permitted in any medium without royalty provided the copyright notice
24 # and this notice are preserved. This file is offered as-is, without any
25 # warranty.
26
27 #serial 10
28
29 AC_DEFUN([AX_COUNT_CPUS],[
30 AC_REQUIRE([AC_CANONICAL_HOST])
31 AC_REQUIRE([AC_PROG_EGREP])
32 AC_MSG_CHECKING([the number of available CPUs])
33 CPU_COUNT="0"
34
35 AS_CASE([$host_os],[
36 *darwin*],[
37 AS_IF([test -x /usr/sbin/sysctl],[
38 sysctl_a=`/usr/sbin/sysctl -a 2>/dev/null| grep -c hw.cpu`
39 AS_IF([test sysctl_a],[
40 CPU_COUNT=`/usr/sbin/sysctl -n hw.ncpu`
41 ])
42 ])],[
43 *linux*],[
44 AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[
45 AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[
46 CPU_COUNT=`$EGREP -c '^processor' /proc/cpuinfo`
47 ])
48 ])
49 ])
50
51 AS_IF([test "x$CPU_COUNT" = "x0"],[
52 CPU_COUNT="1"
53 AC_MSG_RESULT( [unable to detect (assuming 1)] )
54 ],[
55 AC_MSG_RESULT( $CPU_COUNT )
56 ])
57 ])