Commit | Line | Data |
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94d7c01a | 1 | /* Functions for memory limit warnings. |
e231fd42 | 2 | Copyright (C) 1990, 1992 Free Software Foundation, Inc. |
94d7c01a JA |
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 | |
e231fd42 | 8 | the Free Software Foundation; either version 2, or (at your option) |
94d7c01a JA |
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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
94d7c01a | 20 | |
3b672b8f | 21 | #ifdef emacs |
18160b98 | 22 | #include <config.h> |
94d7c01a | 23 | #include "lisp.h" |
3b672b8f RS |
24 | #endif |
25 | ||
26 | #ifndef emacs | |
27 | #include <stddef.h> | |
28 | typedef size_t SIZE; | |
29 | typedef void *POINTER; | |
30 | #define EXCEEDS_LISP_PTR(x) 0 | |
31 | #endif | |
32 | ||
e231fd42 | 33 | #include "mem-limits.h" |
94d7c01a JA |
34 | |
35 | /* | |
36 | Level number of warnings already issued. | |
37 | 0 -- no warnings issued. | |
38 | 1 -- 75% warning already issued. | |
39 | 2 -- 85% warning already issued. | |
3b672b8f | 40 | 3 -- 95% warning issued; keep warning frequently. |
94d7c01a JA |
41 | */ |
42 | static int warnlevel; | |
43 | ||
44 | /* Function to call to issue a warning; | |
45 | 0 means don't issue them. */ | |
da396c5e | 46 | static void (*warn_function) (); |
94d7c01a | 47 | |
94d7c01a JA |
48 | /* Get more memory space, complaining if we're near the end. */ |
49 | ||
fd065466 RM |
50 | static void |
51 | check_memory_limits () | |
94d7c01a | 52 | { |
134994ae RM |
53 | extern POINTER (*__morecore) (); |
54 | ||
94d7c01a | 55 | register POINTER cp; |
46b3623d RS |
56 | unsigned long five_percent; |
57 | unsigned long data_size; | |
94d7c01a JA |
58 | |
59 | if (lim_data == 0) | |
60 | get_lim_data (); | |
3b672b8f | 61 | five_percent = lim_data / 20; |
94d7c01a JA |
62 | |
63 | /* Find current end of memory and issue warning if getting near max */ | |
fd065466 | 64 | cp = (char *) (*__morecore) (0); |
da396c5e | 65 | data_size = (char *) cp - (char *) data_space_start; |
94d7c01a | 66 | |
da396c5e | 67 | if (warn_function) |
94d7c01a JA |
68 | switch (warnlevel) |
69 | { | |
70 | case 0: | |
3b672b8f | 71 | if (data_size > five_percent * 15) |
94d7c01a JA |
72 | { |
73 | warnlevel++; | |
3b672b8f | 74 | (*warn_function) ("Warning: past 75% of memory limit"); |
94d7c01a JA |
75 | } |
76 | break; | |
77 | ||
78 | case 1: | |
3b672b8f | 79 | if (data_size > five_percent * 17) |
94d7c01a JA |
80 | { |
81 | warnlevel++; | |
3b672b8f | 82 | (*warn_function) ("Warning: past 85% of memory limit"); |
94d7c01a JA |
83 | } |
84 | break; | |
85 | ||
86 | case 2: | |
3b672b8f | 87 | if (data_size > five_percent * 19) |
94d7c01a JA |
88 | { |
89 | warnlevel++; | |
3b672b8f | 90 | (*warn_function) ("Warning: past 95% of memory limit"); |
94d7c01a JA |
91 | } |
92 | break; | |
93 | ||
94 | default: | |
3b672b8f | 95 | (*warn_function) ("Warning: past acceptable memory limits"); |
94d7c01a JA |
96 | break; |
97 | } | |
98 | ||
3b672b8f RS |
99 | /* If we go down below 70% full, issue another 75% warning |
100 | when we go up again. */ | |
101 | if (data_size < five_percent * 14) | |
102 | warnlevel = 0; | |
103 | /* If we go down below 80% full, issue another 85% warning | |
104 | when we go up again. */ | |
105 | else if (warnlevel > 1 && data_size < five_percent * 16) | |
106 | warnlevel = 1; | |
107 | /* If we go down below 90% full, issue another 95% warning | |
108 | when we go up again. */ | |
109 | else if (warnlevel > 2 && data_size < five_percent * 18) | |
110 | warnlevel = 2; | |
111 | ||
112 | if (EXCEEDS_LISP_PTR (cp)) | |
da396c5e | 113 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
94d7c01a JA |
114 | } |
115 | ||
116 | /* Cause reinitialization based on job parameters; | |
117 | also declare where the end of pure storage is. */ | |
118 | ||
119 | void | |
3b672b8f | 120 | memory_warnings (start, warnfun) |
94d7c01a JA |
121 | POINTER start; |
122 | void (*warnfun) (); | |
123 | { | |
fd065466 | 124 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
94d7c01a JA |
125 | |
126 | if (start) | |
127 | data_space_start = start; | |
3b672b8f RS |
128 | else |
129 | data_space_start = start_of_data (); | |
130 | ||
da396c5e | 131 | warn_function = warnfun; |
fd065466 | 132 | __after_morecore_hook = check_memory_limits; |
b78e8d0a AI |
133 | |
134 | #ifdef WINDOWSNT | |
135 | /* Force data limit to be recalculated on each run. */ | |
136 | lim_data = 0; | |
137 | #endif | |
94d7c01a | 138 | } |