Commit | Line | Data |
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ec7f624d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
a00c95d9 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
a00c95d9 | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
a00c95d9 | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
37ddcaf6 MD |
19 | /* #define DEBUGINFO */ |
20 | ||
dbb605f5 | 21 | #ifdef HAVE_CONFIG_H |
aa54a9b0 RB |
22 | # include <config.h> |
23 | #endif | |
56495472 | 24 | |
e7bca227 LC |
25 | #include "libguile/gen-scmconfig.h" |
26 | ||
0f2d19dd | 27 | #include <stdio.h> |
e6e2e95a | 28 | #include <errno.h> |
783e7774 | 29 | #include <string.h> |
6360beb2 | 30 | #include <math.h> |
e6e2e95a | 31 | |
3ec17f28 LC |
32 | #ifdef __ia64__ |
33 | #include <ucontext.h> | |
34 | extern unsigned long * __libc_ia64_register_backing_store_base; | |
35 | #endif | |
36 | ||
a0599745 | 37 | #include "libguile/_scm.h" |
0a7a7445 | 38 | #include "libguile/eval.h" |
a0599745 MD |
39 | #include "libguile/stime.h" |
40 | #include "libguile/stackchk.h" | |
41 | #include "libguile/struct.h" | |
a0599745 | 42 | #include "libguile/smob.h" |
2fa901a5 | 43 | #include "libguile/arrays.h" |
a0599745 MD |
44 | #include "libguile/async.h" |
45 | #include "libguile/ports.h" | |
46 | #include "libguile/root.h" | |
47 | #include "libguile/strings.h" | |
48 | #include "libguile/vectors.h" | |
801cb5e7 | 49 | #include "libguile/weaks.h" |
686765af | 50 | #include "libguile/hashtab.h" |
ecf470a2 | 51 | #include "libguile/tags.h" |
a0599745 | 52 | |
c8a1bdc4 | 53 | #include "libguile/private-gc.h" |
a0599745 | 54 | #include "libguile/validate.h" |
1be6b49c | 55 | #include "libguile/deprecation.h" |
a0599745 | 56 | #include "libguile/gc.h" |
9de87eea | 57 | #include "libguile/dynwind.h" |
fce59c93 | 58 | |
1c44468d | 59 | #include "libguile/bdw-gc.h" |
a82e7953 | 60 | |
cc3546b0 AW |
61 | /* For GC_set_start_callback. */ |
62 | #include <gc/gc_mark.h> | |
63 | ||
bc9d9bb2 | 64 | #ifdef GUILE_DEBUG_MALLOC |
a0599745 | 65 | #include "libguile/debug-malloc.h" |
bc9d9bb2 MD |
66 | #endif |
67 | ||
0f2d19dd | 68 | #ifdef HAVE_MALLOC_H |
95b88819 | 69 | #include <malloc.h> |
0f2d19dd JB |
70 | #endif |
71 | ||
72 | #ifdef HAVE_UNISTD_H | |
95b88819 | 73 | #include <unistd.h> |
0f2d19dd JB |
74 | #endif |
75 | ||
eae33935 | 76 | /* Set this to != 0 if every cell that is accessed shall be checked: |
61045190 | 77 | */ |
eab1b259 HWN |
78 | int scm_debug_cell_accesses_p = 0; |
79 | int scm_expensive_debug_cell_accesses_p = 0; | |
406c7d90 | 80 | |
e81d98ec DH |
81 | /* Set this to 0 if no additional gc's shall be performed, otherwise set it to |
82 | * the number of cell accesses after which a gc shall be called. | |
83 | */ | |
eab1b259 | 84 | int scm_debug_cells_gc_interval = 0; |
e81d98ec | 85 | |
f0d1bacd | 86 | #if SCM_ENABLE_DEPRECATED == 1 |
acbccb0c LC |
87 | /* Hash table that keeps a reference to objects the user wants to protect from |
88 | garbage collection. It could arguably be private but applications have come | |
89 | to rely on it (e.g., Lilypond 2.13.9). */ | |
90 | SCM scm_protects; | |
f0d1bacd AW |
91 | #else |
92 | static SCM scm_protects; | |
93 | #endif | |
e7efe8e7 | 94 | |
eab1b259 HWN |
95 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
96 | ||
97 | ||
98 | /* | |
99 | ||
100 | Assert that the given object is a valid reference to a valid cell. This | |
101 | test involves to determine whether the object is a cell pointer, whether | |
102 | this pointer actually points into a heap segment and whether the cell | |
103 | pointed to is not a free cell. Further, additional garbage collections may | |
104 | get executed after a user defined number of cell accesses. This helps to | |
105 | find places in the C code where references are dropped for extremely short | |
106 | periods. | |
107 | ||
108 | */ | |
406c7d90 | 109 | void |
eab1b259 | 110 | scm_i_expensive_validation_check (SCM cell) |
406c7d90 | 111 | { |
eab1b259 HWN |
112 | /* If desired, perform additional garbage collections after a user |
113 | * defined number of cell accesses. | |
114 | */ | |
115 | if (scm_debug_cells_gc_interval) | |
116 | { | |
117 | static unsigned int counter = 0; | |
61045190 | 118 | |
eab1b259 HWN |
119 | if (counter != 0) |
120 | { | |
121 | --counter; | |
122 | } | |
123 | else | |
124 | { | |
125 | counter = scm_debug_cells_gc_interval; | |
b17e0ac3 | 126 | scm_gc (); |
eab1b259 HWN |
127 | } |
128 | } | |
129 | } | |
130 | ||
8c93b597 LC |
131 | /* Whether cell validation is already running. */ |
132 | static int scm_i_cell_validation_already_running = 0; | |
133 | ||
eab1b259 HWN |
134 | void |
135 | scm_assert_cell_valid (SCM cell) | |
136 | { | |
137 | if (!scm_i_cell_validation_already_running && scm_debug_cell_accesses_p) | |
406c7d90 | 138 | { |
eab1b259 | 139 | scm_i_cell_validation_already_running = 1; /* set to avoid recursion */ |
406c7d90 | 140 | |
c8a1bdc4 | 141 | /* |
eab1b259 HWN |
142 | During GC, no user-code should be run, and the guile core |
143 | should use non-protected accessors. | |
144 | */ | |
c8a1bdc4 | 145 | if (scm_gc_running_p) |
eab1b259 | 146 | return; |
c8a1bdc4 HWN |
147 | |
148 | /* | |
eab1b259 HWN |
149 | Only scm_in_heap_p and rescanning the heap is wildly |
150 | expensive. | |
151 | */ | |
152 | if (scm_expensive_debug_cell_accesses_p) | |
153 | scm_i_expensive_validation_check (cell); | |
b4246e5b | 154 | |
eab1b259 | 155 | scm_i_cell_validation_already_running = 0; /* re-enable */ |
406c7d90 DH |
156 | } |
157 | } | |
158 | ||
159 | ||
eab1b259 | 160 | |
406c7d90 DH |
161 | SCM_DEFINE (scm_set_debug_cell_accesses_x, "set-debug-cell-accesses!", 1, 0, 0, |
162 | (SCM flag), | |
1e6808ea | 163 | "If @var{flag} is @code{#f}, cell access checking is disabled.\n" |
eab1b259 | 164 | "If @var{flag} is @code{#t}, cheap cell access checking is enabled,\n" |
e81d98ec | 165 | "but no additional calls to garbage collection are issued.\n" |
eab1b259 | 166 | "If @var{flag} is a number, strict cell access checking is enabled,\n" |
e81d98ec DH |
167 | "with an additional garbage collection after the given\n" |
168 | "number of cell accesses.\n" | |
1e6808ea MG |
169 | "This procedure only exists when the compile-time flag\n" |
170 | "@code{SCM_DEBUG_CELL_ACCESSES} was set to 1.") | |
406c7d90 DH |
171 | #define FUNC_NAME s_scm_set_debug_cell_accesses_x |
172 | { | |
7888309b | 173 | if (scm_is_false (flag)) |
eab1b259 HWN |
174 | { |
175 | scm_debug_cell_accesses_p = 0; | |
176 | } | |
bc36d050 | 177 | else if (scm_is_eq (flag, SCM_BOOL_T)) |
eab1b259 HWN |
178 | { |
179 | scm_debug_cells_gc_interval = 0; | |
180 | scm_debug_cell_accesses_p = 1; | |
181 | scm_expensive_debug_cell_accesses_p = 0; | |
182 | } | |
e11e83f3 | 183 | else |
eab1b259 | 184 | { |
e11e83f3 | 185 | scm_debug_cells_gc_interval = scm_to_signed_integer (flag, 0, INT_MAX); |
eab1b259 HWN |
186 | scm_debug_cell_accesses_p = 1; |
187 | scm_expensive_debug_cell_accesses_p = 1; | |
188 | } | |
406c7d90 DH |
189 | return SCM_UNSPECIFIED; |
190 | } | |
191 | #undef FUNC_NAME | |
0f2d19dd | 192 | |
ecf470a2 | 193 | |
c8a1bdc4 | 194 | #endif /* SCM_DEBUG_CELL_ACCESSES == 1 */ |
0f2d19dd JB |
195 | |
196 | \f | |
14294ce0 | 197 | |
6360beb2 AW |
198 | /* Compatibility. */ |
199 | ||
14294ce0 AW |
200 | #ifndef HAVE_GC_GET_HEAP_USAGE_SAFE |
201 | static void | |
202 | GC_get_heap_usage_safe (GC_word *pheap_size, GC_word *pfree_bytes, | |
203 | GC_word *punmapped_bytes, GC_word *pbytes_since_gc, | |
204 | GC_word *ptotal_bytes) | |
205 | { | |
206 | *pheap_size = GC_get_heap_size (); | |
207 | *pfree_bytes = GC_get_free_bytes (); | |
208 | *punmapped_bytes = GC_get_unmapped_bytes (); | |
209 | *pbytes_since_gc = GC_get_bytes_since_gc (); | |
210 | *ptotal_bytes = GC_get_total_bytes (); | |
211 | } | |
212 | #endif | |
213 | ||
6360beb2 AW |
214 | #ifndef HAVE_GC_GET_FREE_SPACE_DIVISOR |
215 | static GC_word | |
216 | GC_get_free_space_divisor (void) | |
217 | { | |
218 | return GC_free_space_divisor; | |
219 | } | |
220 | #endif | |
221 | ||
14294ce0 | 222 | \f |
26224b3f LC |
223 | /* Hooks. */ |
224 | scm_t_c_hook scm_before_gc_c_hook; | |
225 | scm_t_c_hook scm_before_mark_c_hook; | |
226 | scm_t_c_hook scm_before_sweep_c_hook; | |
227 | scm_t_c_hook scm_after_sweep_c_hook; | |
228 | scm_t_c_hook scm_after_gc_c_hook; | |
945fec60 | 229 | |
0f2d19dd | 230 | |
0fbdbe6c AW |
231 | static void |
232 | run_before_gc_c_hook (void) | |
233 | { | |
234 | scm_c_hook_run (&scm_before_gc_c_hook, NULL); | |
235 | } | |
236 | ||
237 | ||
0f2d19dd JB |
238 | /* GC Statistics Keeping |
239 | */ | |
b74e86cf | 240 | unsigned long scm_gc_ports_collected = 0; |
00b6ef23 AW |
241 | static long gc_time_taken = 0; |
242 | static long gc_start_time = 0; | |
243 | ||
6360beb2 AW |
244 | static unsigned long free_space_divisor; |
245 | static unsigned long minimum_free_space_divisor; | |
246 | static double target_free_space_divisor; | |
b74e86cf | 247 | |
915b3f9f | 248 | static unsigned long protected_obj_count = 0; |
c2cbcc57 | 249 | |
0f2d19dd | 250 | |
17ab1dc3 | 251 | SCM_SYMBOL (sym_gc_time_taken, "gc-time-taken"); |
915b3f9f LC |
252 | SCM_SYMBOL (sym_heap_size, "heap-size"); |
253 | SCM_SYMBOL (sym_heap_free_size, "heap-free-size"); | |
254 | SCM_SYMBOL (sym_heap_total_allocated, "heap-total-allocated"); | |
17ab1dc3 | 255 | SCM_SYMBOL (sym_heap_allocated_since_gc, "heap-allocated-since-gc"); |
7eec4c37 | 256 | SCM_SYMBOL (sym_protected_objects, "protected-objects"); |
17ab1dc3 | 257 | SCM_SYMBOL (sym_times, "gc-times"); |
cf2d30f6 | 258 | |
d3dd80ab | 259 | |
0f2d19dd JB |
260 | /* {Scheme Interface to GC} |
261 | */ | |
1367aa5e HWN |
262 | static SCM |
263 | tag_table_to_type_alist (void *closure, SCM key, SCM val, SCM acc) | |
264 | { | |
8fecbb19 | 265 | if (scm_is_integer (key)) |
8a00ba71 | 266 | { |
3e2073bd | 267 | int c_tag = scm_to_int (key); |
8fecbb19 HWN |
268 | |
269 | char const * name = scm_i_tag_name (c_tag); | |
270 | if (name != NULL) | |
271 | { | |
272 | key = scm_from_locale_string (name); | |
273 | } | |
274 | else | |
275 | { | |
276 | char s[100]; | |
277 | sprintf (s, "tag %d", c_tag); | |
278 | key = scm_from_locale_string (s); | |
279 | } | |
8a00ba71 | 280 | } |
8fecbb19 | 281 | |
1367aa5e HWN |
282 | return scm_cons (scm_cons (key, val), acc); |
283 | } | |
284 | ||
285 | SCM_DEFINE (scm_gc_live_object_stats, "gc-live-object-stats", 0, 0, 0, | |
286 | (), | |
287 | "Return an alist of statistics of the current live objects. ") | |
288 | #define FUNC_NAME s_scm_gc_live_object_stats | |
289 | { | |
290 | SCM tab = scm_make_hash_table (scm_from_int (57)); | |
b01532af NJ |
291 | SCM alist; |
292 | ||
b01532af | 293 | alist |
1367aa5e HWN |
294 | = scm_internal_hash_fold (&tag_table_to_type_alist, NULL, SCM_EOL, tab); |
295 | ||
296 | return alist; | |
297 | } | |
298 | #undef FUNC_NAME | |
299 | ||
c2cbcc57 | 300 | extern int scm_gc_malloc_yield_percentage; |
a00c95d9 | 301 | SCM_DEFINE (scm_gc_stats, "gc-stats", 0, 0, 0, |
1bbd0b84 | 302 | (), |
1e6808ea | 303 | "Return an association list of statistics about Guile's current\n" |
c8a1bdc4 | 304 | "use of storage.\n") |
1bbd0b84 | 305 | #define FUNC_NAME s_scm_gc_stats |
0f2d19dd | 306 | { |
0f2d19dd | 307 | SCM answer; |
14294ce0 | 308 | GC_word heap_size, free_bytes, unmapped_bytes, bytes_since_gc, total_bytes; |
915b3f9f | 309 | size_t gc_times; |
4c9419ac | 310 | |
14294ce0 AW |
311 | GC_get_heap_usage_safe (&heap_size, &free_bytes, &unmapped_bytes, |
312 | &bytes_since_gc, &total_bytes); | |
313 | gc_times = GC_gc_no; | |
fca43887 | 314 | |
b9bd8526 | 315 | answer = |
00b6ef23 | 316 | scm_list_n (scm_cons (sym_gc_time_taken, scm_from_long (gc_time_taken)), |
915b3f9f LC |
317 | scm_cons (sym_heap_size, scm_from_size_t (heap_size)), |
318 | scm_cons (sym_heap_free_size, scm_from_size_t (free_bytes)), | |
319 | scm_cons (sym_heap_total_allocated, | |
320 | scm_from_size_t (total_bytes)), | |
17ab1dc3 AW |
321 | scm_cons (sym_heap_allocated_since_gc, |
322 | scm_from_size_t (bytes_since_gc)), | |
915b3f9f LC |
323 | scm_cons (sym_protected_objects, |
324 | scm_from_ulong (protected_obj_count)), | |
325 | scm_cons (sym_times, scm_from_size_t (gc_times)), | |
b9bd8526 | 326 | SCM_UNDEFINED); |
fca43887 | 327 | |
c8a1bdc4 | 328 | return answer; |
0f2d19dd | 329 | } |
c8a1bdc4 | 330 | #undef FUNC_NAME |
0f2d19dd | 331 | |
539b08a4 | 332 | |
7f9ec18a LC |
333 | SCM_DEFINE (scm_gc_dump, "gc-dump", 0, 0, 0, |
334 | (void), | |
335 | "Dump information about the garbage collector's internal data " | |
336 | "structures and memory usage to the standard output.") | |
337 | #define FUNC_NAME s_scm_gc_dump | |
338 | { | |
339 | GC_dump (); | |
340 | ||
341 | return SCM_UNSPECIFIED; | |
342 | } | |
343 | #undef FUNC_NAME | |
344 | ||
acf4331f | 345 | |
c8a1bdc4 HWN |
346 | SCM_DEFINE (scm_object_address, "object-address", 1, 0, 0, |
347 | (SCM obj), | |
348 | "Return an integer that for the lifetime of @var{obj} is uniquely\n" | |
349 | "returned by this function for @var{obj}") | |
350 | #define FUNC_NAME s_scm_object_address | |
c68296f8 | 351 | { |
b9bd8526 | 352 | return scm_from_ulong (SCM_UNPACK (obj)); |
c68296f8 | 353 | } |
c8a1bdc4 | 354 | #undef FUNC_NAME |
c68296f8 | 355 | |
1be6b49c | 356 | |
915b3f9f LC |
357 | SCM_DEFINE (scm_gc_disable, "gc-disable", 0, 0, 0, |
358 | (), | |
359 | "Disables the garbage collector. Nested calls are permitted. " | |
360 | "GC is re-enabled once @code{gc-enable} has been called the " | |
361 | "same number of times @code{gc-disable} was called.") | |
362 | #define FUNC_NAME s_scm_gc_disable | |
363 | { | |
364 | GC_disable (); | |
365 | return SCM_UNSPECIFIED; | |
366 | } | |
367 | #undef FUNC_NAME | |
368 | ||
369 | SCM_DEFINE (scm_gc_enable, "gc-enable", 0, 0, 0, | |
370 | (), | |
371 | "Enables the garbage collector.") | |
372 | #define FUNC_NAME s_scm_gc_enable | |
373 | { | |
374 | GC_enable (); | |
375 | return SCM_UNSPECIFIED; | |
376 | } | |
377 | #undef FUNC_NAME | |
378 | ||
379 | ||
c8a1bdc4 HWN |
380 | SCM_DEFINE (scm_gc, "gc", 0, 0, 0, |
381 | (), | |
382 | "Scans all of SCM objects and reclaims for further use those that are\n" | |
383 | "no longer accessible.") | |
384 | #define FUNC_NAME s_scm_gc | |
385 | { | |
b17e0ac3 | 386 | scm_i_gc ("call"); |
c8a1bdc4 | 387 | return SCM_UNSPECIFIED; |
9d47a1e6 | 388 | } |
c8a1bdc4 | 389 | #undef FUNC_NAME |
9d47a1e6 | 390 | |
c8a1bdc4 | 391 | void |
b17e0ac3 | 392 | scm_i_gc (const char *what) |
c8a1bdc4 | 393 | { |
66b229d5 AW |
394 | #ifndef HAVE_GC_SET_START_CALLBACK |
395 | run_before_gc_c_hook (); | |
396 | #endif | |
26224b3f | 397 | GC_gcollect (); |
eab1b259 | 398 | } |
0f2d19dd | 399 | |
4c7016dc | 400 | |
0f2d19dd JB |
401 | \f |
402 | /* {GC Protection Helper Functions} | |
403 | */ | |
404 | ||
405 | ||
5d2b97cd DH |
406 | /* |
407 | * If within a function you need to protect one or more scheme objects from | |
408 | * garbage collection, pass them as parameters to one of the | |
409 | * scm_remember_upto_here* functions below. These functions don't do | |
410 | * anything, but since the compiler does not know that they are actually | |
411 | * no-ops, it will generate code that calls these functions with the given | |
412 | * parameters. Therefore, you can be sure that the compiler will keep those | |
413 | * scheme values alive (on the stack or in a register) up to the point where | |
414 | * scm_remember_upto_here* is called. In other words, place the call to | |
592996c9 | 415 | * scm_remember_upto_here* _behind_ the last code in your function, that |
5d2b97cd DH |
416 | * depends on the scheme object to exist. |
417 | * | |
8c494e99 DH |
418 | * Example: We want to make sure that the string object str does not get |
419 | * garbage collected during the execution of 'some_function' in the code | |
420 | * below, because otherwise the characters belonging to str would be freed and | |
5d2b97cd DH |
421 | * 'some_function' might access freed memory. To make sure that the compiler |
422 | * keeps str alive on the stack or in a register such that it is visible to | |
423 | * the conservative gc we add the call to scm_remember_upto_here_1 _after_ the | |
424 | * call to 'some_function'. Note that this would not be necessary if str was | |
425 | * used anyway after the call to 'some_function'. | |
eb01cb64 | 426 | * char *chars = scm_i_string_chars (str); |
5d2b97cd DH |
427 | * some_function (chars); |
428 | * scm_remember_upto_here_1 (str); // str will be alive up to this point. | |
429 | */ | |
430 | ||
9e1569bd KR |
431 | /* Remove any macro versions of these while defining the functions. |
432 | Functions are always included in the library, for upward binary | |
433 | compatibility and in case combinations of GCC and non-GCC are used. */ | |
434 | #undef scm_remember_upto_here_1 | |
435 | #undef scm_remember_upto_here_2 | |
436 | ||
5d2b97cd | 437 | void |
e81d98ec | 438 | scm_remember_upto_here_1 (SCM obj SCM_UNUSED) |
5d2b97cd DH |
439 | { |
440 | /* Empty. Protects a single object from garbage collection. */ | |
441 | } | |
442 | ||
443 | void | |
e81d98ec | 444 | scm_remember_upto_here_2 (SCM obj1 SCM_UNUSED, SCM obj2 SCM_UNUSED) |
5d2b97cd DH |
445 | { |
446 | /* Empty. Protects two objects from garbage collection. */ | |
447 | } | |
448 | ||
449 | void | |
e81d98ec | 450 | scm_remember_upto_here (SCM obj SCM_UNUSED, ...) |
5d2b97cd DH |
451 | { |
452 | /* Empty. Protects any number of objects from garbage collection. */ | |
453 | } | |
454 | ||
c209c88e | 455 | /* |
41b0806d GB |
456 | These crazy functions prevent garbage collection |
457 | of arguments after the first argument by | |
458 | ensuring they remain live throughout the | |
459 | function because they are used in the last | |
460 | line of the code block. | |
461 | It'd be better to have a nice compiler hint to | |
462 | aid the conservative stack-scanning GC. --03/09/00 gjb */ | |
0f2d19dd JB |
463 | SCM |
464 | scm_return_first (SCM elt, ...) | |
0f2d19dd JB |
465 | { |
466 | return elt; | |
467 | } | |
468 | ||
41b0806d GB |
469 | int |
470 | scm_return_first_int (int i, ...) | |
471 | { | |
472 | return i; | |
473 | } | |
474 | ||
0f2d19dd | 475 | |
0f2d19dd | 476 | SCM |
6e8d25a6 | 477 | scm_permanent_object (SCM obj) |
0f2d19dd | 478 | { |
8e7b3e98 | 479 | return (scm_gc_protect_object (obj)); |
0f2d19dd JB |
480 | } |
481 | ||
482 | ||
7bd4fbe2 MD |
483 | /* Protect OBJ from the garbage collector. OBJ will not be freed, even if all |
484 | other references are dropped, until the object is unprotected by calling | |
6b1b030e | 485 | scm_gc_unprotect_object (OBJ). Calls to scm_gc_protect/unprotect_object nest, |
7bd4fbe2 MD |
486 | i. e. it is possible to protect the same object several times, but it is |
487 | necessary to unprotect the object the same number of times to actually get | |
488 | the object unprotected. It is an error to unprotect an object more often | |
489 | than it has been protected before. The function scm_protect_object returns | |
490 | OBJ. | |
491 | */ | |
492 | ||
493 | /* Implementation note: For every object X, there is a counter which | |
1f584400 | 494 | scm_gc_protect_object (X) increments and scm_gc_unprotect_object (X) decrements. |
7bd4fbe2 | 495 | */ |
686765af | 496 | |
7eec4c37 HWN |
497 | |
498 | ||
ef290276 | 499 | SCM |
6b1b030e | 500 | scm_gc_protect_object (SCM obj) |
ef290276 | 501 | { |
686765af | 502 | SCM handle; |
9d47a1e6 | 503 | |
686765af | 504 | /* This critical section barrier will be replaced by a mutex. */ |
33b320ae NJ |
505 | /* njrev: Indeed; if my comment above is correct, there is the same |
506 | critsec/mutex inconsistency here. */ | |
9de87eea | 507 | SCM_CRITICAL_SECTION_START; |
9d47a1e6 | 508 | |
acbccb0c | 509 | handle = scm_hashq_create_handle_x (scm_protects, obj, scm_from_int (0)); |
e11e83f3 | 510 | SCM_SETCDR (handle, scm_sum (SCM_CDR (handle), scm_from_int (1))); |
9d47a1e6 | 511 | |
7eec4c37 HWN |
512 | protected_obj_count ++; |
513 | ||
9de87eea | 514 | SCM_CRITICAL_SECTION_END; |
9d47a1e6 | 515 | |
ef290276 JB |
516 | return obj; |
517 | } | |
518 | ||
519 | ||
520 | /* Remove any protection for OBJ established by a prior call to | |
dab7f566 | 521 | scm_protect_object. This function returns OBJ. |
ef290276 | 522 | |
dab7f566 | 523 | See scm_protect_object for more information. */ |
ef290276 | 524 | SCM |
6b1b030e | 525 | scm_gc_unprotect_object (SCM obj) |
ef290276 | 526 | { |
686765af | 527 | SCM handle; |
9d47a1e6 | 528 | |
686765af | 529 | /* This critical section barrier will be replaced by a mutex. */ |
33b320ae | 530 | /* njrev: and again. */ |
9de87eea | 531 | SCM_CRITICAL_SECTION_START; |
9d47a1e6 | 532 | |
0ff7e3ff HWN |
533 | if (scm_gc_running_p) |
534 | { | |
535 | fprintf (stderr, "scm_unprotect_object called during GC.\n"); | |
536 | abort (); | |
537 | } | |
b17e0ac3 | 538 | |
acbccb0c | 539 | handle = scm_hashq_get_handle (scm_protects, obj); |
9d47a1e6 | 540 | |
7888309b | 541 | if (scm_is_false (handle)) |
686765af | 542 | { |
0f0f0899 MD |
543 | fprintf (stderr, "scm_unprotect_object called on unprotected object\n"); |
544 | abort (); | |
686765af | 545 | } |
6a199940 DH |
546 | else |
547 | { | |
e11e83f3 | 548 | SCM count = scm_difference (SCM_CDR (handle), scm_from_int (1)); |
bc36d050 | 549 | if (scm_is_eq (count, scm_from_int (0))) |
acbccb0c | 550 | scm_hashq_remove_x (scm_protects, obj); |
6a199940 | 551 | else |
1be6b49c | 552 | SCM_SETCDR (handle, count); |
6a199940 | 553 | } |
7eec4c37 | 554 | protected_obj_count --; |
686765af | 555 | |
9de87eea | 556 | SCM_CRITICAL_SECTION_END; |
ef290276 JB |
557 | |
558 | return obj; | |
559 | } | |
560 | ||
6b1b030e ML |
561 | void |
562 | scm_gc_register_root (SCM *p) | |
563 | { | |
8e7b3e98 | 564 | /* Nothing. */ |
6b1b030e ML |
565 | } |
566 | ||
567 | void | |
568 | scm_gc_unregister_root (SCM *p) | |
569 | { | |
8e7b3e98 | 570 | /* Nothing. */ |
6b1b030e ML |
571 | } |
572 | ||
573 | void | |
574 | scm_gc_register_roots (SCM *b, unsigned long n) | |
575 | { | |
576 | SCM *p = b; | |
577 | for (; p < b + n; ++p) | |
578 | scm_gc_register_root (p); | |
579 | } | |
580 | ||
581 | void | |
582 | scm_gc_unregister_roots (SCM *b, unsigned long n) | |
583 | { | |
584 | SCM *p = b; | |
585 | for (; p < b + n; ++p) | |
586 | scm_gc_unregister_root (p); | |
587 | } | |
588 | ||
0f2d19dd | 589 | \f |
a00c95d9 | 590 | |
4c48ba06 | 591 | |
c8a1bdc4 HWN |
592 | /* |
593 | MOVE THIS FUNCTION. IT DOES NOT HAVE ANYTHING TODO WITH GC. | |
594 | */ | |
85db4a2c DH |
595 | |
596 | /* Get an integer from an environment variable. */ | |
c8a1bdc4 HWN |
597 | int |
598 | scm_getenv_int (const char *var, int def) | |
85db4a2c | 599 | { |
c8a1bdc4 HWN |
600 | char *end = 0; |
601 | char *val = getenv (var); | |
602 | long res = def; | |
85db4a2c DH |
603 | if (!val) |
604 | return def; | |
605 | res = strtol (val, &end, 10); | |
606 | if (end == val) | |
607 | return def; | |
608 | return res; | |
609 | } | |
610 | ||
c35738c1 MD |
611 | void |
612 | scm_storage_prehistory () | |
613 | { | |
184327a6 | 614 | GC_all_interior_pointers = 0; |
6360beb2 AW |
615 | free_space_divisor = scm_getenv_int ("GC_FREE_SPACE_DIVISOR", 3); |
616 | minimum_free_space_divisor = free_space_divisor; | |
617 | target_free_space_divisor = free_space_divisor; | |
618 | GC_set_free_space_divisor (free_space_divisor); | |
184327a6 | 619 | |
a82e7953 | 620 | GC_INIT (); |
e7bca227 | 621 | |
11d2fc06 LC |
622 | #if (! ((defined GC_VERSION_MAJOR) && (GC_VERSION_MAJOR >= 7))) \ |
623 | && (defined SCM_I_GSC_USE_PTHREAD_THREADS) | |
e7bca227 LC |
624 | /* When using GC 6.8, this call is required to initialize thread-local |
625 | freelists (shouldn't be necessary with GC 7.0). */ | |
626 | GC_init (); | |
627 | #endif | |
628 | ||
fdab75a1 | 629 | GC_expand_hp (SCM_DEFAULT_INIT_HEAP_SIZE_2); |
915b3f9f | 630 | |
184327a6 LC |
631 | /* We only need to register a displacement for those types for which the |
632 | higher bits of the type tag are used to store a pointer (that is, a | |
633 | pointer to an 8-octet aligned region). For `scm_tc3_struct', this is | |
634 | handled in `scm_alloc_struct ()'. */ | |
635 | GC_REGISTER_DISPLACEMENT (scm_tc3_cons); | |
314b8716 | 636 | /* GC_REGISTER_DISPLACEMENT (scm_tc3_unused); */ |
184327a6 | 637 | |
915b3f9f | 638 | /* Sanity check. */ |
acbccb0c | 639 | if (!GC_is_visible (&scm_protects)) |
915b3f9f | 640 | abort (); |
a82e7953 | 641 | |
c35738c1 MD |
642 | scm_c_hook_init (&scm_before_gc_c_hook, 0, SCM_C_HOOK_NORMAL); |
643 | scm_c_hook_init (&scm_before_mark_c_hook, 0, SCM_C_HOOK_NORMAL); | |
644 | scm_c_hook_init (&scm_before_sweep_c_hook, 0, SCM_C_HOOK_NORMAL); | |
645 | scm_c_hook_init (&scm_after_sweep_c_hook, 0, SCM_C_HOOK_NORMAL); | |
646 | scm_c_hook_init (&scm_after_gc_c_hook, 0, SCM_C_HOOK_NORMAL); | |
647 | } | |
85db4a2c | 648 | |
9de87eea | 649 | scm_i_pthread_mutex_t scm_i_gc_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
eb01cb64 | 650 | |
562cd1b8 AW |
651 | void |
652 | scm_init_gc_protect_object () | |
0f2d19dd | 653 | { |
acbccb0c | 654 | scm_protects = scm_c_make_hash_table (31); |
4a4c9785 | 655 | |
9de87eea MV |
656 | #if 0 |
657 | /* We can't have a cleanup handler since we have no thread to run it | |
658 | in. */ | |
659 | ||
a18bcd0e | 660 | #ifdef HAVE_ATEXIT |
c45acc34 | 661 | atexit (cleanup); |
e52ceaac MD |
662 | #else |
663 | #ifdef HAVE_ON_EXIT | |
664 | on_exit (cleanup, 0); | |
665 | #endif | |
9de87eea MV |
666 | #endif |
667 | ||
a18bcd0e | 668 | #endif |
0f2d19dd | 669 | } |
939794ce | 670 | |
0f2d19dd JB |
671 | \f |
672 | ||
939794ce DH |
673 | SCM scm_after_gc_hook; |
674 | ||
cc3546b0 | 675 | static SCM after_gc_async_cell; |
939794ce | 676 | |
cc3546b0 AW |
677 | /* The function after_gc_async_thunk causes the execution of the |
678 | * after-gc-hook. It is run after the gc, as soon as the asynchronous | |
679 | * events are handled by the evaluator. | |
939794ce DH |
680 | */ |
681 | static SCM | |
cc3546b0 | 682 | after_gc_async_thunk (void) |
939794ce | 683 | { |
cc3546b0 AW |
684 | /* Fun, no? Hook-run *and* run-hook? */ |
685 | scm_c_hook_run (&scm_after_gc_c_hook, NULL); | |
939794ce | 686 | scm_c_run_hook (scm_after_gc_hook, SCM_EOL); |
939794ce DH |
687 | return SCM_UNSPECIFIED; |
688 | } | |
689 | ||
690 | ||
cc3546b0 AW |
691 | /* The function queue_after_gc_hook is run by the scm_before_gc_c_hook |
692 | * at the end of the garbage collection. The only purpose of this | |
693 | * function is to mark the after_gc_async (which will eventually lead to | |
694 | * the execution of the after_gc_async_thunk). | |
939794ce DH |
695 | */ |
696 | static void * | |
cc3546b0 AW |
697 | queue_after_gc_hook (void * hook_data SCM_UNUSED, |
698 | void *fn_data SCM_UNUSED, | |
699 | void *data SCM_UNUSED) | |
e81d98ec DH |
700 | { |
701 | /* If cell access debugging is enabled, the user may choose to perform | |
702 | * additional garbage collections after an arbitrary number of cell | |
703 | * accesses. We don't want the scheme level after-gc-hook to be performed | |
704 | * for each of these garbage collections for the following reason: The | |
705 | * execution of the after-gc-hook causes cell accesses itself. Thus, if the | |
706 | * after-gc-hook was performed with every gc, and if the gc was performed | |
707 | * after a very small number of cell accesses, then the number of cell | |
708 | * accesses during the execution of the after-gc-hook will suffice to cause | |
709 | * the execution of the next gc. Then, guile would keep executing the | |
710 | * after-gc-hook over and over again, and would never come to do other | |
711 | * things. | |
eae33935 | 712 | * |
e81d98ec DH |
713 | * To overcome this problem, if cell access debugging with additional |
714 | * garbage collections is enabled, the after-gc-hook is never run by the | |
715 | * garbage collecter. When running guile with cell access debugging and the | |
716 | * execution of the after-gc-hook is desired, then it is necessary to run | |
717 | * the hook explicitly from the user code. This has the effect, that from | |
718 | * the scheme level point of view it seems that garbage collection is | |
719 | * performed with a much lower frequency than it actually is. Obviously, | |
720 | * this will not work for code that depends on a fixed one to one | |
721 | * relationship between the execution counts of the C level garbage | |
722 | * collection hooks and the execution count of the scheme level | |
723 | * after-gc-hook. | |
724 | */ | |
9de87eea | 725 | |
e81d98ec | 726 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
eab1b259 | 727 | if (scm_debug_cells_gc_interval == 0) |
e81d98ec | 728 | #endif |
cc3546b0 AW |
729 | { |
730 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
731 | ||
732 | if (scm_is_false (SCM_CDR (after_gc_async_cell))) | |
733 | { | |
734 | SCM_SETCDR (after_gc_async_cell, t->active_asyncs); | |
735 | t->active_asyncs = after_gc_async_cell; | |
736 | t->pending_asyncs = 1; | |
737 | } | |
738 | } | |
e81d98ec | 739 | |
939794ce DH |
740 | return NULL; |
741 | } | |
742 | ||
00b6ef23 AW |
743 | \f |
744 | ||
745 | static void * | |
746 | start_gc_timer (void * hook_data SCM_UNUSED, | |
747 | void *fn_data SCM_UNUSED, | |
748 | void *data SCM_UNUSED) | |
749 | { | |
750 | if (!gc_start_time) | |
751 | gc_start_time = scm_c_get_internal_run_time (); | |
752 | ||
753 | return NULL; | |
754 | } | |
755 | ||
756 | static void * | |
757 | accumulate_gc_timer (void * hook_data SCM_UNUSED, | |
758 | void *fn_data SCM_UNUSED, | |
759 | void *data SCM_UNUSED) | |
760 | { | |
761 | if (gc_start_time) | |
6360beb2 AW |
762 | { |
763 | long now = scm_c_get_internal_run_time (); | |
00b6ef23 AW |
764 | gc_time_taken += now - gc_start_time; |
765 | gc_start_time = 0; | |
766 | } | |
767 | ||
768 | return NULL; | |
769 | } | |
770 | ||
6360beb2 AW |
771 | /* Return some idea of the memory footprint of a process, in bytes. |
772 | Currently only works on Linux systems. */ | |
773 | static size_t | |
774 | get_image_size (void) | |
775 | { | |
776 | unsigned long size, resident, share; | |
8ac70433 | 777 | size_t ret = 0; |
6360beb2 AW |
778 | |
779 | FILE *fp = fopen ("/proc/self/statm", "r"); | |
780 | ||
781 | if (fp && fscanf (fp, "%lu %lu %lu", &size, &resident, &share) == 3) | |
782 | ret = resident * 4096; | |
783 | ||
784 | if (fp) | |
785 | fclose (fp); | |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
fd51e661 AW |
790 | /* These are discussed later. */ |
791 | static size_t bytes_until_gc; | |
792 | static scm_i_pthread_mutex_t bytes_until_gc_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER; | |
793 | ||
6360beb2 AW |
794 | /* Make GC run more frequently when the process image size is growing, |
795 | measured against the number of bytes allocated through the GC. | |
796 | ||
797 | If Guile is allocating at a GC-managed heap size H, libgc will tend | |
798 | to limit the process image size to H*N. But if at the same time the | |
799 | user program is mallocating at a rate M bytes per GC-allocated byte, | |
800 | then the process stabilizes at H*N*M -- assuming that collecting data | |
801 | will result in malloc'd data being freed. It doesn't take a very | |
802 | large M for this to be a bad situation. To limit the image size, | |
803 | Guile should GC more often -- the bigger the M, the more often. | |
804 | ||
805 | Numeric functions that produce bigger and bigger integers are | |
806 | pessimal, because M is an increasing function of time. Here is an | |
807 | example of such a function: | |
808 | ||
809 | (define (factorial n) | |
810 | (define (fac n acc) | |
811 | (if (<= n 1) | |
812 | acc | |
813 | (fac (1- n) (* n acc)))) | |
814 | (fac n 1)) | |
815 | ||
816 | It is possible for a process to grow for reasons that will not be | |
817 | solved by faster GC. In that case M will be estimated as | |
818 | artificially high for a while, and so GC will happen more often on | |
819 | the Guile side. But when it stabilizes, Guile can ease back the GC | |
820 | frequency. | |
821 | ||
822 | The key is to measure process image growth, not mallocation rate. | |
823 | For maximum effectiveness, Guile reacts quickly to process growth, | |
824 | and exponentially backs down when the process stops growing. | |
825 | ||
826 | See http://thread.gmane.org/gmane.lisp.guile.devel/12552/focus=12936 | |
827 | for further discussion. | |
828 | */ | |
829 | static void * | |
830 | adjust_gc_frequency (void * hook_data SCM_UNUSED, | |
831 | void *fn_data SCM_UNUSED, | |
832 | void *data SCM_UNUSED) | |
833 | { | |
834 | static size_t prev_image_size = 0; | |
835 | static size_t prev_bytes_alloced = 0; | |
836 | size_t image_size; | |
837 | size_t bytes_alloced; | |
838 | ||
fd51e661 AW |
839 | scm_i_pthread_mutex_lock (&bytes_until_gc_lock); |
840 | bytes_until_gc = GC_get_heap_size (); | |
841 | scm_i_pthread_mutex_unlock (&bytes_until_gc_lock); | |
842 | ||
6360beb2 AW |
843 | image_size = get_image_size (); |
844 | bytes_alloced = GC_get_total_bytes (); | |
845 | ||
d1c03624 | 846 | #define HEURISTICS_DEBUG 0 |
6360beb2 AW |
847 | |
848 | #if HEURISTICS_DEBUG | |
849 | fprintf (stderr, "prev image / alloced: %lu / %lu\n", prev_image_size, prev_bytes_alloced); | |
850 | fprintf (stderr, " image / alloced: %lu / %lu\n", image_size, bytes_alloced); | |
851 | fprintf (stderr, "divisor %lu / %f\n", free_space_divisor, target_free_space_divisor); | |
852 | #endif | |
853 | ||
854 | if (prev_image_size && bytes_alloced != prev_bytes_alloced) | |
855 | { | |
856 | double growth_rate, new_target_free_space_divisor; | |
857 | double decay_factor = 0.5; | |
858 | double hysteresis = 0.1; | |
859 | ||
860 | growth_rate = ((double) image_size - prev_image_size) | |
861 | / ((double)bytes_alloced - prev_bytes_alloced); | |
862 | ||
863 | #if HEURISTICS_DEBUG | |
864 | fprintf (stderr, "growth rate %f\n", growth_rate); | |
865 | #endif | |
866 | ||
867 | new_target_free_space_divisor = minimum_free_space_divisor; | |
868 | ||
869 | if (growth_rate > 0) | |
870 | new_target_free_space_divisor *= 1.0 + growth_rate; | |
871 | ||
872 | #if HEURISTICS_DEBUG | |
873 | fprintf (stderr, "new divisor %f\n", new_target_free_space_divisor); | |
874 | #endif | |
875 | ||
876 | if (new_target_free_space_divisor < target_free_space_divisor) | |
877 | /* Decay down. */ | |
878 | target_free_space_divisor = | |
879 | (decay_factor * target_free_space_divisor | |
880 | + (1.0 - decay_factor) * new_target_free_space_divisor); | |
881 | else | |
882 | /* Jump up. */ | |
883 | target_free_space_divisor = new_target_free_space_divisor; | |
884 | ||
885 | #if HEURISTICS_DEBUG | |
886 | fprintf (stderr, "new target divisor %f\n", target_free_space_divisor); | |
887 | #endif | |
888 | ||
889 | if (free_space_divisor + 0.5 + hysteresis < target_free_space_divisor | |
890 | || free_space_divisor - 0.5 - hysteresis > target_free_space_divisor) | |
891 | { | |
892 | free_space_divisor = lround (target_free_space_divisor); | |
893 | #if HEURISTICS_DEBUG | |
894 | fprintf (stderr, "new divisor %lu\n", free_space_divisor); | |
895 | #endif | |
896 | GC_set_free_space_divisor (free_space_divisor); | |
897 | } | |
898 | } | |
899 | ||
900 | prev_image_size = image_size; | |
901 | prev_bytes_alloced = bytes_alloced; | |
902 | ||
903 | return NULL; | |
904 | } | |
905 | ||
fd51e661 AW |
906 | /* The adjust_gc_frequency routine handles transients in the process |
907 | image size. It can't handle instense non-GC-managed steady-state | |
908 | allocation though, as it decays the FSD at steady-state down to its | |
909 | minimum value. | |
910 | ||
911 | The only real way to handle continuous, high non-GC allocation is to | |
912 | let the GC know about it. This routine can handle non-GC allocation | |
913 | rates that are similar in size to the GC-managed heap size. | |
914 | */ | |
915 | ||
916 | void | |
917 | scm_gc_register_allocation (size_t size) | |
918 | { | |
919 | scm_i_pthread_mutex_lock (&bytes_until_gc_lock); | |
920 | if (bytes_until_gc - size > bytes_until_gc) | |
921 | { | |
922 | bytes_until_gc = GC_get_heap_size (); | |
923 | scm_i_pthread_mutex_unlock (&bytes_until_gc_lock); | |
924 | GC_gcollect (); | |
925 | } | |
926 | else | |
927 | { | |
928 | bytes_until_gc -= size; | |
929 | scm_i_pthread_mutex_unlock (&bytes_until_gc_lock); | |
930 | } | |
931 | } | |
932 | ||
00b6ef23 AW |
933 | |
934 | \f | |
935 | ||
26224b3f LC |
936 | char const * |
937 | scm_i_tag_name (scm_t_bits tag) | |
938 | { | |
74ec8d78 | 939 | switch (tag & 0x7f) /* 7 bits */ |
26224b3f LC |
940 | { |
941 | case scm_tcs_struct: | |
942 | return "struct"; | |
943 | case scm_tcs_cons_imcar: | |
944 | return "cons (immediate car)"; | |
945 | case scm_tcs_cons_nimcar: | |
946 | return "cons (non-immediate car)"; | |
5b46a8c2 | 947 | case scm_tc7_pointer: |
e2c2a699 | 948 | return "foreign"; |
c99de5aa AW |
949 | case scm_tc7_hashtable: |
950 | return "hashtable"; | |
9ea31741 AW |
951 | case scm_tc7_fluid: |
952 | return "fluid"; | |
953 | case scm_tc7_dynamic_state: | |
954 | return "dynamic state"; | |
6f3b0cc2 AW |
955 | case scm_tc7_frame: |
956 | return "frame"; | |
957 | case scm_tc7_objcode: | |
958 | return "objcode"; | |
959 | case scm_tc7_vm: | |
960 | return "vm"; | |
961 | case scm_tc7_vm_cont: | |
962 | return "vm continuation"; | |
26224b3f LC |
963 | case scm_tc7_wvect: |
964 | return "weak vector"; | |
965 | case scm_tc7_vector: | |
966 | return "vector"; | |
26224b3f LC |
967 | case scm_tc7_number: |
968 | switch (tag) | |
969 | { | |
970 | case scm_tc16_real: | |
971 | return "real"; | |
972 | break; | |
973 | case scm_tc16_big: | |
974 | return "bignum"; | |
975 | break; | |
976 | case scm_tc16_complex: | |
977 | return "complex number"; | |
978 | break; | |
979 | case scm_tc16_fraction: | |
980 | return "fraction"; | |
981 | break; | |
982 | } | |
983 | break; | |
984 | case scm_tc7_string: | |
985 | return "string"; | |
986 | break; | |
987 | case scm_tc7_stringbuf: | |
988 | return "string buffer"; | |
989 | break; | |
990 | case scm_tc7_symbol: | |
991 | return "symbol"; | |
992 | break; | |
993 | case scm_tc7_variable: | |
994 | return "variable"; | |
995 | break; | |
26224b3f LC |
996 | case scm_tc7_port: |
997 | return "port"; | |
998 | break; | |
999 | case scm_tc7_smob: | |
74ec8d78 AW |
1000 | { |
1001 | int k = 0xff & (tag >> 8); | |
1002 | return (scm_smobs[k].name); | |
1003 | } | |
26224b3f LC |
1004 | break; |
1005 | } | |
1006 | ||
1007 | return NULL; | |
1008 | } | |
1009 | ||
1010 | ||
26224b3f LC |
1011 | |
1012 | \f | |
0f2d19dd JB |
1013 | void |
1014 | scm_init_gc () | |
0f2d19dd | 1015 | { |
a82e7953 | 1016 | /* `GC_INIT ()' was invoked in `scm_storage_prehistory ()'. */ |
d678e25c | 1017 | |
f39448c5 | 1018 | scm_after_gc_hook = scm_make_hook (SCM_INUM0); |
fde50407 | 1019 | scm_c_define ("after-gc-hook", scm_after_gc_hook); |
939794ce | 1020 | |
cc3546b0 AW |
1021 | /* When the async is to run, the cdr of the gc_async pair gets set to |
1022 | the asyncs queue of the current thread. */ | |
1023 | after_gc_async_cell = scm_cons (scm_c_make_gsubr ("%after-gc-thunk", 0, 0, 0, | |
1024 | after_gc_async_thunk), | |
1025 | SCM_BOOL_F); | |
939794ce | 1026 | |
cc3546b0 | 1027 | scm_c_hook_add (&scm_before_gc_c_hook, queue_after_gc_hook, NULL, 0); |
00b6ef23 AW |
1028 | scm_c_hook_add (&scm_before_gc_c_hook, start_gc_timer, NULL, 0); |
1029 | scm_c_hook_add (&scm_after_gc_c_hook, accumulate_gc_timer, NULL, 0); | |
66b229d5 | 1030 | |
738c899e AW |
1031 | #if HAVE_GC_GET_HEAP_USAGE_SAFE |
1032 | /* GC_get_heap_usage does not take a lock, and so can run in the GC | |
1033 | start hook. */ | |
1034 | scm_c_hook_add (&scm_before_gc_c_hook, adjust_gc_frequency, NULL, 0); | |
1035 | #else | |
1036 | /* GC_get_heap_usage might take a lock (and did from 7.2alpha1 to | |
1037 | 7.2alpha7), so call it in the after_gc_hook. */ | |
1038 | scm_c_hook_add (&scm_after_gc_c_hook, adjust_gc_frequency, NULL, 0); | |
1039 | #endif | |
1040 | ||
66b229d5 | 1041 | #ifdef HAVE_GC_SET_START_CALLBACK |
cc3546b0 | 1042 | GC_set_start_callback (run_before_gc_c_hook); |
66b229d5 | 1043 | #endif |
939794ce | 1044 | |
a0599745 | 1045 | #include "libguile/gc.x" |
0f2d19dd | 1046 | } |
89e00824 | 1047 | |
c8a1bdc4 HWN |
1048 | |
1049 | void | |
1050 | scm_gc_sweep (void) | |
1051 | #define FUNC_NAME "scm_gc_sweep" | |
1052 | { | |
26224b3f | 1053 | /* FIXME */ |
cd169c5a | 1054 | fprintf (stderr, "%s: doing nothing\n", FUNC_NAME); |
c8a1bdc4 | 1055 | } |
c8a1bdc4 HWN |
1056 | #undef FUNC_NAME |
1057 | ||
89e00824 ML |
1058 | /* |
1059 | Local Variables: | |
1060 | c-file-style: "gnu" | |
1061 | End: | |
1062 | */ |