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94d7c01a | 1 | /* Functions for memory limit warnings. |
429ab54e | 2 | Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, |
8cabe764 | 3 | 2005, 2006, 2007, 2008 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 | |
684d6f5b | 9 | the Free Software Foundation; either version 3, 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 | 35 | |
933f22f4 RS |
36 | #ifdef HAVE_GETRLIMIT |
37 | #include <sys/resource.h> | |
38 | #endif | |
39 | ||
94d7c01a JA |
40 | /* |
41 | Level number of warnings already issued. | |
42 | 0 -- no warnings issued. | |
43 | 1 -- 75% warning already issued. | |
44 | 2 -- 85% warning already issued. | |
3b672b8f | 45 | 3 -- 95% warning issued; keep warning frequently. |
94d7c01a | 46 | */ |
395d3972 RS |
47 | enum warnlevel { not_warned, warned_75, warned_85, warned_95 }; |
48 | ||
49 | static enum warnlevel warnlevel; | |
94d7c01a JA |
50 | |
51 | /* Function to call to issue a warning; | |
52 | 0 means don't issue them. */ | |
da396c5e | 53 | static void (*warn_function) (); |
94d7c01a | 54 | |
395d3972 RS |
55 | /* Start of data space; can be changed by calling malloc_init. */ |
56 | static POINTER data_space_start; | |
57 | ||
58 | /* Number of bytes of writable memory we can expect to be able to get. */ | |
59 | static unsigned long lim_data; | |
60 | \f | |
61 | ||
62 | #ifdef NO_LIM_DATA | |
63 | static void | |
64 | get_lim_data () | |
65 | { | |
66 | lim_data = -1; | |
67 | } | |
68 | #else /* not NO_LIM_DATA */ | |
69 | ||
70 | #ifdef USG | |
71 | ||
72 | static void | |
73 | get_lim_data () | |
74 | { | |
75 | extern long ulimit (); | |
76 | ||
77 | lim_data = -1; | |
78 | ||
79 | /* Use the ulimit call, if we seem to have it. */ | |
80 | #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX) | |
81 | lim_data = ulimit (3, 0); | |
82 | #endif | |
83 | ||
84 | /* If that didn't work, just use the macro's value. */ | |
85 | #ifdef ULIMIT_BREAK_VALUE | |
86 | if (lim_data == -1) | |
87 | lim_data = ULIMIT_BREAK_VALUE; | |
88 | #endif | |
89 | ||
90 | lim_data -= (long) data_space_start; | |
91 | } | |
92 | ||
93 | #else /* not USG */ | |
94 | #ifdef WINDOWSNT | |
95 | ||
96 | static void | |
97 | get_lim_data () | |
98 | { | |
99 | extern unsigned long reserved_heap_size; | |
100 | lim_data = reserved_heap_size; | |
101 | } | |
102 | ||
103 | #else | |
104 | #if !defined (BSD4_2) && !defined (__osf__) | |
105 | ||
106 | #ifdef MSDOS | |
107 | void | |
108 | get_lim_data () | |
109 | { | |
110 | _go32_dpmi_meminfo info; | |
111 | ||
112 | _go32_dpmi_get_free_memory_information (&info); | |
113 | lim_data = info.available_memory; | |
114 | } | |
115 | #else /* not MSDOS */ | |
116 | static void | |
117 | get_lim_data () | |
118 | { | |
119 | lim_data = vlimit (LIM_DATA, -1); | |
120 | } | |
121 | #endif /* not MSDOS */ | |
122 | ||
123 | #else /* BSD4_2 */ | |
124 | ||
125 | static void | |
126 | get_lim_data () | |
127 | { | |
128 | struct rlimit XXrlimit; | |
129 | ||
130 | getrlimit (RLIMIT_DATA, &XXrlimit); | |
131 | #ifdef RLIM_INFINITY | |
132 | lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */ | |
133 | #else | |
134 | lim_data = XXrlimit.rlim_cur; /* soft limit */ | |
135 | #endif | |
136 | } | |
137 | #endif /* BSD4_2 */ | |
138 | #endif /* not WINDOWSNT */ | |
139 | #endif /* not USG */ | |
140 | #endif /* not NO_LIM_DATA */ | |
141 | \f | |
142 | /* Verify amount of memory available, complaining if we're near the end. */ | |
94d7c01a | 143 | |
fd065466 RM |
144 | static void |
145 | check_memory_limits () | |
94d7c01a | 146 | { |
968e9c04 AI |
147 | #ifdef REL_ALLOC |
148 | extern POINTER (*real_morecore) (); | |
149 | #endif | |
134994ae RM |
150 | extern POINTER (*__morecore) (); |
151 | ||
968e9c04 | 152 | |
94d7c01a | 153 | register POINTER cp; |
46b3623d RS |
154 | unsigned long five_percent; |
155 | unsigned long data_size; | |
395d3972 | 156 | enum warnlevel new_warnlevel; |
94d7c01a | 157 | |
933f22f4 | 158 | #ifdef HAVE_GETRLIMIT |
395d3972 RS |
159 | struct rlimit rlimit; |
160 | ||
161 | getrlimit (RLIMIT_AS, &rlimit); | |
162 | ||
163 | if (RLIM_INFINITY == rlimit.rlim_max) | |
164 | return; | |
933f22f4 | 165 | |
395d3972 RS |
166 | /* This is a nonsensical case, but it happens -- rms. */ |
167 | if (rlimit.rlim_cur > rlimit.rlim_max) | |
168 | return; | |
933f22f4 RS |
169 | |
170 | five_percent = rlimit.rlim_max / 20; | |
171 | data_size = rlimit.rlim_cur; | |
172 | ||
173 | #else /* not HAVE_GETRLIMIT */ | |
174 | ||
94d7c01a JA |
175 | if (lim_data == 0) |
176 | get_lim_data (); | |
3b672b8f | 177 | five_percent = lim_data / 20; |
94d7c01a JA |
178 | |
179 | /* Find current end of memory and issue warning if getting near max */ | |
968e9c04 AI |
180 | #ifdef REL_ALLOC |
181 | if (real_morecore) | |
182 | cp = (char *) (*real_morecore) (0); | |
183 | else | |
184 | #endif | |
fd065466 | 185 | cp = (char *) (*__morecore) (0); |
da396c5e | 186 | data_size = (char *) cp - (char *) data_space_start; |
94d7c01a | 187 | |
933f22f4 RS |
188 | #endif /* not HAVE_GETRLIMIT */ |
189 | ||
395d3972 RS |
190 | if (!warn_function) |
191 | return; | |
192 | ||
193 | /* What level of warning does current memory usage demand? */ | |
194 | if (data_size > five_percent * 19) | |
195 | new_warnlevel = warned_95; | |
196 | else if (data_size > five_percent * 17) | |
197 | new_warnlevel = warned_85; | |
198 | else if (data_size > five_percent * 15) | |
199 | new_warnlevel = warned_75; | |
200 | else | |
201 | new_warnlevel = not_warned; | |
202 | ||
203 | /* If we have gone up a level, give the appropriate warning. */ | |
204 | if (new_warnlevel > warnlevel || new_warnlevel == warned_95) | |
205 | { | |
206 | warnlevel = new_warnlevel; | |
207 | switch (warnlevel) | |
208 | { | |
209 | case warned_75: | |
210 | (*warn_function) ("Warning: past 75% of memory limit"); | |
211 | break; | |
212 | ||
213 | case warned_85: | |
214 | (*warn_function) ("Warning: past 85% of memory limit"); | |
215 | break; | |
216 | ||
217 | case warned_95: | |
218 | (*warn_function) ("Warning: past 95% of memory limit"); | |
219 | } | |
220 | } | |
221 | /* Handle going down in usage levels, with some hysteresis. */ | |
222 | else | |
223 | { | |
224 | /* If we go down below 70% full, issue another 75% warning | |
225 | when we go up again. */ | |
226 | if (data_size < five_percent * 14) | |
227 | warnlevel = not_warned; | |
228 | /* If we go down below 80% full, issue another 85% warning | |
229 | when we go up again. */ | |
230 | else if (warnlevel > warned_75 && data_size < five_percent * 16) | |
231 | warnlevel = warned_75; | |
232 | /* If we go down below 90% full, issue another 95% warning | |
233 | when we go up again. */ | |
234 | else if (warnlevel > warned_85 && data_size < five_percent * 18) | |
235 | warnlevel = warned_85; | |
236 | } | |
3b672b8f RS |
237 | |
238 | if (EXCEEDS_LISP_PTR (cp)) | |
da396c5e | 239 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
94d7c01a | 240 | } |
395d3972 RS |
241 | \f |
242 | /* Enable memory usage warnings. | |
243 | START says where the end of pure storage is. | |
244 | WARNFUN specifies the function to call to issue a warning. */ | |
94d7c01a JA |
245 | |
246 | void | |
3b672b8f | 247 | memory_warnings (start, warnfun) |
94d7c01a JA |
248 | POINTER start; |
249 | void (*warnfun) (); | |
250 | { | |
fd065466 | 251 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
94d7c01a JA |
252 | |
253 | if (start) | |
254 | data_space_start = start; | |
3b672b8f RS |
255 | else |
256 | data_space_start = start_of_data (); | |
257 | ||
da396c5e | 258 | warn_function = warnfun; |
fd065466 | 259 | __after_morecore_hook = check_memory_limits; |
b78e8d0a | 260 | |
b78e8d0a AI |
261 | /* Force data limit to be recalculated on each run. */ |
262 | lim_data = 0; | |
94d7c01a | 263 | } |
ab5796a9 MB |
264 | |
265 | /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5 | |
266 | (do not change this comment) */ |