git.m6w6.name Git - m6w6/libmemcached/blob - 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       ])