osdep/numcores.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer 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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24
  25 #include "numcores.h"
  26
  27 #ifdef _SC_NPROCESSORS_ONLN
  28 #define SCNAME _SC_NPROCESSORS_ONLN
  29 #elif defined _SC_NPROC_ONLN
  30 #define SCNAME _SC_NPROC_ONLN
  31 #elif defined _SC_CRAY_NCPU
  32 #define SCNAME _SC_CRAY_NCPU
  33 #endif
  34
  35 #ifdef _WIN32
  36
  37 #define WIN32_LEAN_AND_MEAN
  38 #include <windows.h>
  39 int default_thread_count(void)
  40 {
  41     SYSTEM_INFO info;
  42     GetSystemInfo(&info);
  43     int count = info.dwNumberOfProcessors;
  44     if (count > 0)
  45         return count;
  46     return -1;
  47 }
  48
  49 #elif defined SCNAME
  50
  51 int default_thread_count(void)
  52 {
  53     long nprocs = sysconf(SCNAME);
  54     if (nprocs < 1)
  55         return -1;
  56     return nprocs;
  57 }
  58
  59 #else
  60
  61 int default_thread_count(void)
  62 {
  63     return -2;
  64 }
  65
  66 #endif