HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| 94d7c01a JA |
1 | /* Functions for memory limit warnings. |
| 2 | Copyright (C) 1990 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of GNU Emacs. | |
| 5 | ||
| 6 | GNU Emacs is free software; you can redistribute it and/or modify | |
| 7 | it under the terms of the GNU General Public License as published by | |
| 8 | the Free Software Foundation; either version 1, or (at your option) | |
| 9 | any later version. | |
| 10 | ||
| 11 | GNU Emacs is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU General Public License | |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to | |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | #include "config.h" | |
| 21 | #include "lisp.h" | |
| 22 | #include "mem_limits.h" | |
| 23 | ||
| 24 | /* | |
| 25 | Level number of warnings already issued. | |
| 26 | 0 -- no warnings issued. | |
| 27 | 1 -- 75% warning already issued. | |
| 28 | 2 -- 85% warning already issued. | |
| 29 | */ | |
| 30 | static int warnlevel; | |
| 31 | ||
| 32 | /* Function to call to issue a warning; | |
| 33 | 0 means don't issue them. */ | |
| 34 | static void (*warnfunction) (); | |
| 35 | ||
| 36 | extern POINTER sbrk (); | |
| 37 | ||
| 38 | /* Get more memory space, complaining if we're near the end. */ | |
| 39 | ||
| 40 | static POINTER | |
| 41 | morecore_with_warning (size) | |
| 42 | register int size; | |
| 43 | { | |
| 44 | POINTER result; | |
| 45 | register POINTER cp; | |
| 46 | register unsigned int siz; | |
| 47 | ||
| 48 | if (!data_space_start) | |
| 49 | { | |
| 50 | data_space_start = start_of_data (); | |
| 51 | } | |
| 52 | ||
| 53 | if (lim_data == 0) | |
| 54 | get_lim_data (); | |
| 55 | ||
| 56 | /* Find current end of memory and issue warning if getting near max */ | |
| 57 | cp = sbrk (0); | |
| 58 | siz = cp - data_space_start; | |
| 59 | ||
| 60 | if (warnfunction) | |
| 61 | switch (warnlevel) | |
| 62 | { | |
| 63 | case 0: | |
| 64 | if (siz > (lim_data / 4) * 3) | |
| 65 | { | |
| 66 | warnlevel++; | |
| 67 | (*warnfunction) ("Warning: past 75% of memory limit"); | |
| 68 | } | |
| 69 | break; | |
| 70 | ||
| 71 | case 1: | |
| 72 | if (siz > (lim_data / 20) * 17) | |
| 73 | { | |
| 74 | warnlevel++; | |
| 75 | (*warnfunction) ("Warning: past 85% of memory limit"); | |
| 76 | } | |
| 77 | break; | |
| 78 | ||
| 79 | case 2: | |
| 80 | if (siz > (lim_data / 20) * 19) | |
| 81 | { | |
| 82 | warnlevel++; | |
| 83 | (*warnfunction) ("Warning: past 95% of memory limit"); | |
| 84 | } | |
| 85 | break; | |
| 86 | ||
| 87 | default: | |
| 88 | (*warnfunction) ("Warning: past acceptable memory limits"); | |
| 89 | break; | |
| 90 | } | |
| 91 | ||
| 92 | if (EXCEEDS_ELISP_PTR (cp)) | |
| 93 | (*warnfunction) ("Warning: memory in use exceeds lisp pointer size"); | |
| 94 | ||
| 95 | result = sbrk (size); | |
| 96 | if (result == (POINTER) -1) | |
| 97 | return NULL; | |
| 98 | return result; | |
| 99 | } | |
| 100 | ||
| 101 | /* Cause reinitialization based on job parameters; | |
| 102 | also declare where the end of pure storage is. */ | |
| 103 | ||
| 104 | void | |
| 105 | malloc_init (start, warnfun) | |
| 106 | POINTER start; | |
| 107 | void (*warnfun) (); | |
| 108 | { | |
| 109 | extern POINTER (* __morecore) (); /* From gmalloc.c */ | |
| 110 | ||
| 111 | if (start) | |
| 112 | data_space_start = start; | |
| 113 | lim_data = 0; | |
| 114 | warnlevel = 0; | |
| 115 | warnfunction = warnfun; | |
| 116 | __morecore = &morecore_with_warning; | |
| 117 | } |