Commit | Line | Data |
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94d7c01a | 1 | /* Functions for memory limit warnings. |
0b5538bd TTN |
2 | Copyright (C) 1990, 1992, 2002, 2003, 2004, |
3 | 2005 Free Software Foundation, Inc. | |
94d7c01a JA |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
e231fd42 | 9 | the Free Software Foundation; either version 2, or (at your option) |
94d7c01a JA |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
94d7c01a | 21 | |
3b672b8f | 22 | #ifdef emacs |
18160b98 | 23 | #include <config.h> |
94d7c01a | 24 | #include "lisp.h" |
3b672b8f RS |
25 | #endif |
26 | ||
27 | #ifndef emacs | |
28 | #include <stddef.h> | |
29 | typedef size_t SIZE; | |
30 | typedef void *POINTER; | |
31 | #define EXCEEDS_LISP_PTR(x) 0 | |
32 | #endif | |
33 | ||
e231fd42 | 34 | #include "mem-limits.h" |
94d7c01a JA |
35 | |
36 | /* | |
37 | Level number of warnings already issued. | |
38 | 0 -- no warnings issued. | |
39 | 1 -- 75% warning already issued. | |
40 | 2 -- 85% warning already issued. | |
3b672b8f | 41 | 3 -- 95% warning issued; keep warning frequently. |
94d7c01a JA |
42 | */ |
43 | static int warnlevel; | |
44 | ||
45 | /* Function to call to issue a warning; | |
46 | 0 means don't issue them. */ | |
da396c5e | 47 | static void (*warn_function) (); |
94d7c01a | 48 | |
94d7c01a JA |
49 | /* Get more memory space, complaining if we're near the end. */ |
50 | ||
fd065466 RM |
51 | static void |
52 | check_memory_limits () | |
94d7c01a | 53 | { |
968e9c04 AI |
54 | #ifdef REL_ALLOC |
55 | extern POINTER (*real_morecore) (); | |
56 | #endif | |
134994ae RM |
57 | extern POINTER (*__morecore) (); |
58 | ||
968e9c04 | 59 | |
94d7c01a | 60 | register POINTER cp; |
46b3623d RS |
61 | unsigned long five_percent; |
62 | unsigned long data_size; | |
94d7c01a JA |
63 | |
64 | if (lim_data == 0) | |
65 | get_lim_data (); | |
3b672b8f | 66 | five_percent = lim_data / 20; |
94d7c01a JA |
67 | |
68 | /* Find current end of memory and issue warning if getting near max */ | |
968e9c04 AI |
69 | #ifdef REL_ALLOC |
70 | if (real_morecore) | |
71 | cp = (char *) (*real_morecore) (0); | |
72 | else | |
73 | #endif | |
fd065466 | 74 | cp = (char *) (*__morecore) (0); |
da396c5e | 75 | data_size = (char *) cp - (char *) data_space_start; |
94d7c01a | 76 | |
da396c5e | 77 | if (warn_function) |
94d7c01a JA |
78 | switch (warnlevel) |
79 | { | |
177c0ea7 | 80 | case 0: |
3b672b8f | 81 | if (data_size > five_percent * 15) |
94d7c01a JA |
82 | { |
83 | warnlevel++; | |
3b672b8f | 84 | (*warn_function) ("Warning: past 75% of memory limit"); |
94d7c01a JA |
85 | } |
86 | break; | |
87 | ||
177c0ea7 | 88 | case 1: |
3b672b8f | 89 | if (data_size > five_percent * 17) |
94d7c01a JA |
90 | { |
91 | warnlevel++; | |
3b672b8f | 92 | (*warn_function) ("Warning: past 85% of memory limit"); |
94d7c01a JA |
93 | } |
94 | break; | |
95 | ||
177c0ea7 | 96 | case 2: |
3b672b8f | 97 | if (data_size > five_percent * 19) |
94d7c01a JA |
98 | { |
99 | warnlevel++; | |
3b672b8f | 100 | (*warn_function) ("Warning: past 95% of memory limit"); |
94d7c01a JA |
101 | } |
102 | break; | |
103 | ||
104 | default: | |
3b672b8f | 105 | (*warn_function) ("Warning: past acceptable memory limits"); |
94d7c01a JA |
106 | break; |
107 | } | |
108 | ||
3b672b8f RS |
109 | /* If we go down below 70% full, issue another 75% warning |
110 | when we go up again. */ | |
111 | if (data_size < five_percent * 14) | |
112 | warnlevel = 0; | |
113 | /* If we go down below 80% full, issue another 85% warning | |
114 | when we go up again. */ | |
115 | else if (warnlevel > 1 && data_size < five_percent * 16) | |
116 | warnlevel = 1; | |
117 | /* If we go down below 90% full, issue another 95% warning | |
118 | when we go up again. */ | |
119 | else if (warnlevel > 2 && data_size < five_percent * 18) | |
120 | warnlevel = 2; | |
121 | ||
122 | if (EXCEEDS_LISP_PTR (cp)) | |
da396c5e | 123 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
94d7c01a JA |
124 | } |
125 | ||
126 | /* Cause reinitialization based on job parameters; | |
127 | also declare where the end of pure storage is. */ | |
128 | ||
129 | void | |
3b672b8f | 130 | memory_warnings (start, warnfun) |
94d7c01a JA |
131 | POINTER start; |
132 | void (*warnfun) (); | |
133 | { | |
fd065466 | 134 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
94d7c01a JA |
135 | |
136 | if (start) | |
137 | data_space_start = start; | |
3b672b8f RS |
138 | else |
139 | data_space_start = start_of_data (); | |
140 | ||
da396c5e | 141 | warn_function = warnfun; |
fd065466 | 142 | __after_morecore_hook = check_memory_limits; |
b78e8d0a AI |
143 | |
144 | #ifdef WINDOWSNT | |
145 | /* Force data limit to be recalculated on each run. */ | |
146 | lim_data = 0; | |
147 | #endif | |
94d7c01a | 148 | } |
ab5796a9 MB |
149 | |
150 | /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5 | |
151 | (do not change this comment) */ |