projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| a354191e KG |
1 | /* Calculate the size of physical memory. |
| 2 | Copyright 2000, 2001 Free Software Foundation, Inc. | |
| 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; either version 2, or (at your option) | |
| 7 | any later version. | |
| 8 | ||
| 9 | This program 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 | |
| 15 | along with this program; if not, write to the Free Software Foundation, | |
| 16 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 17 | ||
| 18 | /* Written by Paul Eggert. */ | |
| 19 | ||
| 20 | #if HAVE_CONFIG_H | |
| 21 | # include <config.h> | |
| 22 | #endif | |
| 23 | ||
| 24 | #if HAVE_UNISTD_H | |
| 25 | # include <unistd.h> | |
| 26 | #endif | |
| 27 | ||
| 28 | #if HAVE_SYS_PSTAT_H | |
| 29 | # include <sys/pstat.h> | |
| 30 | #endif | |
| 31 | ||
| 32 | /* Return the total amount of physical memory. */ | |
| 33 | double | |
| e9019af6 | 34 | physmem_total () |
| a354191e KG |
35 | { |
| 36 | #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE | |
| 37 | { | |
| 38 | double pages = sysconf (_SC_PHYS_PAGES); | |
| 39 | double pagesize = sysconf (_SC_PAGESIZE); | |
| 40 | if (0 <= pages && 0 <= pagesize) | |
| 41 | return pages * pagesize; | |
| 42 | } | |
| 43 | #endif | |
| 44 | ||
| 45 | #if HAVE_PSTAT_GETSTATIC | |
| 46 | { | |
| 47 | struct pst_static pss; | |
| 48 | if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)) | |
| 49 | { | |
| 50 | double pages = pss.physical_memory; | |
| 51 | double pagesize = pss.page_size; | |
| 52 | if (0 <= pages && 0 <= pagesize) | |
| 53 | return pages * pagesize; | |
| 54 | } | |
| 55 | } | |
| 56 | #endif | |
| 57 | ||
| 58 | /* Return 0 if we can't determine the value. */ | |
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| 62 | /* Return the amount of physical memory available. */ | |
| 63 | double | |
| e9019af6 | 64 | physmem_available () |
| a354191e KG |
65 | { |
| 66 | #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE | |
| 67 | { | |
| 68 | double pages = sysconf (_SC_AVPHYS_PAGES); | |
| 69 | double pagesize = sysconf (_SC_PAGESIZE); | |
| 70 | if (0 <= pages && 0 <= pagesize) | |
| 71 | return pages * pagesize; | |
| 72 | } | |
| 73 | #endif | |
| 74 | ||
| 75 | #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC | |
| 76 | { | |
| 77 | struct pst_static pss; | |
| 78 | struct pst_dynamic psd; | |
| 79 | if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0) | |
| 80 | && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0)) | |
| 81 | { | |
| 82 | double pages = psd.psd_free; | |
| 83 | double pagesize = pss.page_size; | |
| 84 | if (0 <= pages && 0 <= pagesize) | |
| 85 | return pages * pagesize; | |
| 86 | } | |
| 87 | } | |
| 88 | #endif | |
| 89 | ||
| 90 | /* Guess 25% of physical memory. */ | |
| 91 | return physmem_total () / 4; | |
| 92 | } |