release/src/router/mysql/mysys/my_getncpus.c

   1 /*
   2    Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; version 2 of the License.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, write to the Free Software
  15    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  16 */
  17
  18 /* get the number of (online) CPUs */
  19
  20 #include "mysys_priv.h"
  21 #include <unistd.h>
  22
  23 #ifdef _SC_NPROCESSORS_ONLN
  24
  25 static int ncpus=0;
  26
  27 int my_getncpus()
  28 {
  29   if (!ncpus)
  30     ncpus= sysconf(_SC_NPROCESSORS_ONLN);
  31   return ncpus;
  32 }
  33
  34 #else
  35 /* unknown */
  36 int my_getncpus()
  37 {
  38   return 2;
  39 }
  40
  41 #endif
  42