| 1 | /* Functions for memory limit warnings. |
| 2 | Copyright (C) 1990, 1992 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 2, 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 | #ifdef emacs |
| 21 | #include <config.h> |
| 22 | #include "lisp.h" |
| 23 | #endif |
| 24 | |
| 25 | #ifndef emacs |
| 26 | #include <stddef.h> |
| 27 | typedef size_t SIZE; |
| 28 | typedef void *POINTER; |
| 29 | #define EXCEEDS_LISP_PTR(x) 0 |
| 30 | #endif |
| 31 | |
| 32 | #include "mem-limits.h" |
| 33 | |
| 34 | /* |
| 35 | Level number of warnings already issued. |
| 36 | 0 -- no warnings issued. |
| 37 | 1 -- 75% warning already issued. |
| 38 | 2 -- 85% warning already issued. |
| 39 | 3 -- 95% warning issued; keep warning frequently. |
| 40 | */ |
| 41 | static int warnlevel; |
| 42 | |
| 43 | /* Function to call to issue a warning; |
| 44 | 0 means don't issue them. */ |
| 45 | static void (*warn_function) (); |
| 46 | |
| 47 | /* Get more memory space, complaining if we're near the end. */ |
| 48 | |
| 49 | static void |
| 50 | check_memory_limits () |
| 51 | { |
| 52 | extern POINTER (*__morecore) (); |
| 53 | |
| 54 | register POINTER cp; |
| 55 | unsigned long five_percent; |
| 56 | unsigned long data_size; |
| 57 | |
| 58 | if (lim_data == 0) |
| 59 | get_lim_data (); |
| 60 | five_percent = lim_data / 20; |
| 61 | |
| 62 | /* Find current end of memory and issue warning if getting near max */ |
| 63 | cp = (char *) (*__morecore) (0); |
| 64 | data_size = (char *) cp - (char *) data_space_start; |
| 65 | |
| 66 | if (warn_function) |
| 67 | switch (warnlevel) |
| 68 | { |
| 69 | case 0: |
| 70 | if (data_size > five_percent * 15) |
| 71 | { |
| 72 | warnlevel++; |
| 73 | (*warn_function) ("Warning: past 75% of memory limit"); |
| 74 | } |
| 75 | break; |
| 76 | |
| 77 | case 1: |
| 78 | if (data_size > five_percent * 17) |
| 79 | { |
| 80 | warnlevel++; |
| 81 | (*warn_function) ("Warning: past 85% of memory limit"); |
| 82 | } |
| 83 | break; |
| 84 | |
| 85 | case 2: |
| 86 | if (data_size > five_percent * 19) |
| 87 | { |
| 88 | warnlevel++; |
| 89 | (*warn_function) ("Warning: past 95% of memory limit"); |
| 90 | } |
| 91 | break; |
| 92 | |
| 93 | default: |
| 94 | (*warn_function) ("Warning: past acceptable memory limits"); |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | /* If we go down below 70% full, issue another 75% warning |
| 99 | when we go up again. */ |
| 100 | if (data_size < five_percent * 14) |
| 101 | warnlevel = 0; |
| 102 | /* If we go down below 80% full, issue another 85% warning |
| 103 | when we go up again. */ |
| 104 | else if (warnlevel > 1 && data_size < five_percent * 16) |
| 105 | warnlevel = 1; |
| 106 | /* If we go down below 90% full, issue another 95% warning |
| 107 | when we go up again. */ |
| 108 | else if (warnlevel > 2 && data_size < five_percent * 18) |
| 109 | warnlevel = 2; |
| 110 | |
| 111 | if (EXCEEDS_LISP_PTR (cp)) |
| 112 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
| 113 | } |
| 114 | |
| 115 | /* Cause reinitialization based on job parameters; |
| 116 | also declare where the end of pure storage is. */ |
| 117 | |
| 118 | void |
| 119 | memory_warnings (start, warnfun) |
| 120 | POINTER start; |
| 121 | void (*warnfun) (); |
| 122 | { |
| 123 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
| 124 | |
| 125 | if (start) |
| 126 | data_space_start = start; |
| 127 | else |
| 128 | data_space_start = start_of_data (); |
| 129 | |
| 130 | warn_function = warnfun; |
| 131 | __after_morecore_hook = check_memory_limits; |
| 132 | } |