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db137867 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * balloc.c: A block allocator. | |
4 | * | |
5 | * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center | |
6 | * Copyright (C) 1996-2002 Hybrid Development Team | |
7 | * Copyright (C) 2002-2006 ircd-ratbox development team | |
8 | * | |
9 | * Below are the orignal headers from the old blalloc.c | |
10 | * | |
11 | * File: blalloc.c | |
12 | * Owner: Wohali (Joan Touzet) | |
13 | * | |
14 | * Modified 2001/11/29 for mmap() support by Aaron Sethman <androsyn@ratbox.org> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
29 | * USA | |
30 | * | |
3202e249 | 31 | * $Id: balloc.c 26100 2008-09-20 01:27:19Z androsyn $ |
db137867 AC |
32 | */ |
33 | ||
34 | /* | |
35 | * About the block allocator | |
36 | * | |
37 | * Basically we have three ways of getting memory off of the operating | |
38 | * system. Below are this list of methods and the order of preference. | |
39 | * | |
40 | * 1. mmap() anonymous pages with the MMAP_ANON flag. | |
41 | * 2. mmap() via the /dev/zero trick. | |
42 | * 3. HeapCreate/HeapAlloc (on win32) | |
43 | * 4. malloc() | |
44 | * | |
45 | * The advantages of 1 and 2 are this. We can munmap() the pages which will | |
46 | * return the pages back to the operating system, thus reducing the size | |
47 | * of the process as the memory is unused. malloc() on many systems just keeps | |
48 | * a heap of memory to itself, which never gets given back to the OS, except on | |
49 | * exit. This of course is bad, if say we have an event that causes us to allocate | |
50 | * say, 200MB of memory, while our normal memory consumption would be 15MB. In the | |
51 | * malloc() case, the amount of memory allocated to our process never goes down, as | |
52 | * malloc() has it locked up in its heap. With the mmap() method, we can munmap() | |
53 | * the block and return it back to the OS, thus causing our memory consumption to go | |
54 | * down after we no longer need it. | |
55 | * | |
56 | * | |
57 | * | |
58 | */ | |
59 | #include <libratbox_config.h> | |
60 | #include <ratbox_lib.h> | |
61 | ||
3202e249 | 62 | #ifndef NOBALLOC |
db137867 AC |
63 | #ifdef HAVE_MMAP /* We've got mmap() that is good */ |
64 | #include <sys/mman.h> | |
65 | /* HP-UX sucks */ | |
66 | #ifdef MAP_ANONYMOUS | |
67 | #ifndef MAP_ANON | |
68 | #define MAP_ANON MAP_ANONYMOUS | |
69 | #endif | |
70 | #endif | |
71 | #endif | |
3202e249 | 72 | #endif |
db137867 | 73 | |
ce1c921c VY |
74 | static uintptr_t offset_pad; |
75 | ||
db137867 AC |
76 | /* status information for an allocated block in heap */ |
77 | struct rb_heap_block | |
78 | { | |
79 | size_t alloc_size; | |
80 | rb_dlink_node node; | |
81 | unsigned long free_count; | |
82 | void *elems; /* Points to allocated memory */ | |
83 | }; | |
84 | typedef struct rb_heap_block rb_heap_block; | |
85 | ||
db137867 AC |
86 | /* information for the root node of the heap */ |
87 | struct rb_bh | |
88 | { | |
89 | rb_dlink_node hlist; | |
90 | size_t elemSize; /* Size of each element to be stored */ | |
91 | unsigned long elemsPerBlock; /* Number of elements per block */ | |
92 | rb_dlink_list block_list; | |
93 | rb_dlink_list free_list; | |
94 | char *desc; | |
95 | }; | |
96 | ||
97 | #ifndef NOBALLOC | |
3202e249 | 98 | static int newblock(rb_bh *bh); |
db137867 AC |
99 | static void rb_bh_gc_event(void *unused); |
100 | #endif /* !NOBALLOC */ | |
101 | static rb_dlink_list *heap_lists; | |
102 | ||
103 | #if defined(WIN32) | |
104 | static HANDLE block_heap; | |
105 | #endif | |
106 | ||
107 | #define rb_bh_fail(x) _rb_bh_fail(x, __FILE__, __LINE__) | |
108 | ||
109 | static void | |
110 | _rb_bh_fail(const char *reason, const char *file, int line) | |
111 | { | |
112 | rb_lib_log("rb_heap_blockheap failure: %s (%s:%d)", reason, file, line); | |
113 | abort(); | |
114 | } | |
3202e249 | 115 | |
db137867 AC |
116 | #ifndef NOBALLOC |
117 | /* | |
118 | * static inline void free_block(void *ptr, size_t size) | |
119 | * | |
120 | * Inputs: The block and its size | |
121 | * Output: None | |
122 | * Side Effects: Returns memory for the block back to the OS | |
123 | */ | |
124 | static inline void | |
125 | free_block(void *ptr, size_t size) | |
126 | { | |
127 | #ifdef HAVE_MMAP | |
128 | munmap(ptr, size); | |
129 | #else | |
3202e249 | 130 | #ifdef _WIN32 |
db137867 AC |
131 | HeapFree(block_heap, 0, ptr); |
132 | #else | |
133 | free(ptr); | |
134 | #endif | |
135 | #endif | |
136 | } | |
137 | #endif /* !NOBALLOC */ | |
138 | ||
139 | /* | |
140 | * void rb_init_bh(void) | |
141 | * | |
142 | * Inputs: None | |
143 | * Outputs: None | |
144 | * Side Effects: Initializes the block heap | |
145 | */ | |
146 | ||
147 | void | |
148 | rb_init_bh(void) | |
149 | { | |
150 | heap_lists = rb_malloc(sizeof(rb_dlink_list)); | |
ce1c921c VY |
151 | offset_pad = sizeof(void *); |
152 | /* XXX if you get SIGBUS when trying to use a long long..here is where you need to | |
153 | * fix your shit | |
154 | */ | |
155 | #ifdef __sparc__ | |
156 | if((offset_pad % __alignof__(long long)) != 0) | |
157 | { | |
158 | offset_pad += __alignof__(long long); | |
159 | offset_pad &= ~(__alignof__(long long) - 1); | |
160 | } | |
3202e249 VY |
161 | #endif |
162 | ||
db137867 | 163 | #ifndef NOBALLOC |
3202e249 VY |
164 | #ifdef _WIN32 |
165 | block_heap = HeapCreate(HEAP_NO_SERIALIZE, 0, 0); | |
db137867 AC |
166 | #endif |
167 | rb_event_addish("rb_bh_gc_event", rb_bh_gc_event, NULL, 300); | |
168 | #endif /* !NOBALLOC */ | |
169 | } | |
170 | ||
171 | #ifndef NOBALLOC | |
172 | /* | |
173 | * static inline void *get_block(size_t size) | |
174 | * | |
175 | * Input: Size of block to allocate | |
176 | * Output: Pointer to new block | |
177 | * Side Effects: None | |
178 | */ | |
179 | static inline void * | |
180 | get_block(size_t size) | |
181 | { | |
182 | void *ptr; | |
183 | #ifdef HAVE_MMAP | |
184 | #ifdef MAP_ANON | |
185 | ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); | |
186 | #else | |
187 | int zero_fd; | |
188 | zero_fd = open("/dev/zero", O_RDWR); | |
189 | if(zero_fd < 0) | |
190 | rb_bh_fail("Failed opening /dev/zero"); | |
191 | ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, zero_fd, 0); | |
192 | close(zero_fd); | |
193 | #endif /* MAP_ANON */ | |
194 | if(ptr == MAP_FAILED) | |
3202e249 | 195 | ptr = NULL; |
db137867 | 196 | #else |
3202e249 | 197 | #ifdef _WIN32 |
db137867 | 198 | ptr = HeapAlloc(block_heap, 0, size); |
3202e249 | 199 | #else |
db137867 AC |
200 | ptr = malloc(size); |
201 | #endif | |
202 | #endif | |
3202e249 | 203 | return (ptr); |
db137867 AC |
204 | } |
205 | ||
206 | ||
207 | static void | |
208 | rb_bh_gc_event(void *unused) | |
209 | { | |
210 | rb_dlink_node *ptr; | |
211 | RB_DLINK_FOREACH(ptr, heap_lists->head) | |
212 | { | |
213 | rb_bh_gc(ptr->data); | |
214 | } | |
215 | } | |
216 | ||
217 | /* ************************************************************************ */ | |
218 | /* FUNCTION DOCUMENTATION: */ | |
219 | /* newblock */ | |
220 | /* Description: */ | |
221 | /* Allocates a new block for addition to a blockheap */ | |
222 | /* Parameters: */ | |
223 | /* bh (IN): Pointer to parent blockheap. */ | |
224 | /* Returns: */ | |
225 | /* 0 if successful, 1 if not */ | |
226 | /* ************************************************************************ */ | |
227 | ||
228 | static int | |
3202e249 | 229 | newblock(rb_bh *bh) |
db137867 AC |
230 | { |
231 | rb_heap_block *b; | |
232 | unsigned long i; | |
a9fb3ed0 | 233 | uintptr_t offset; |
ce1c921c | 234 | rb_dlink_node *node; |
db137867 AC |
235 | /* Setup the initial data structure. */ |
236 | b = rb_malloc(sizeof(rb_heap_block)); | |
237 | ||
ce1c921c | 238 | b->alloc_size = bh->elemsPerBlock * bh->elemSize; |
db137867 AC |
239 | |
240 | b->elems = get_block(b->alloc_size); | |
c2ac22cc | 241 | if(rb_unlikely(b->elems == NULL)) |
db137867 AC |
242 | { |
243 | return (1); | |
244 | } | |
a9fb3ed0 | 245 | offset = (uintptr_t)b->elems; |
db137867 | 246 | /* Setup our blocks now */ |
3202e249 | 247 | for(i = 0; i < bh->elemsPerBlock; i++, offset += bh->elemSize) |
db137867 | 248 | { |
ce1c921c VY |
249 | *((void **)offset) = b; |
250 | node = (void *)(offset + offset_pad); | |
251 | rb_dlinkAdd((void *)offset, node, &bh->free_list); | |
db137867 AC |
252 | } |
253 | rb_dlinkAdd(b, &b->node, &bh->block_list); | |
3202e249 | 254 | b->free_count = bh->elemsPerBlock; |
db137867 AC |
255 | return (0); |
256 | } | |
257 | #endif /* !NOBALLOC */ | |
258 | ||
259 | /* ************************************************************************ */ | |
260 | /* FUNCTION DOCUMENTATION: */ | |
261 | /* rb_bh_create */ | |
262 | /* Description: */ | |
263 | /* Creates a new blockheap from which smaller blocks can be allocated. */ | |
264 | /* Intended to be used instead of multiple calls to malloc() when */ | |
265 | /* performance is an issue. */ | |
266 | /* Parameters: */ | |
267 | /* elemsize (IN): Size of the basic element to be stored */ | |
268 | /* elemsperblock (IN): Number of elements to be stored in a single block */ | |
269 | /* of memory. When the blockheap runs out of free memory, it will */ | |
270 | /* allocate elemsize * elemsperblock more. */ | |
271 | /* Returns: */ | |
272 | /* Pointer to new rb_bh, or NULL if unsuccessful */ | |
273 | /* ************************************************************************ */ | |
274 | rb_bh * | |
275 | rb_bh_create(size_t elemsize, int elemsperblock, const char *desc) | |
276 | { | |
277 | rb_bh *bh; | |
278 | lrb_assert(elemsize > 0 && elemsperblock > 0); | |
279 | lrb_assert(elemsize >= sizeof(rb_dlink_node)); | |
ce1c921c | 280 | |
db137867 | 281 | /* Catch idiotic requests up front */ |
c2ac22cc | 282 | if((elemsize == 0) || (elemsperblock <= 0)) |
db137867 AC |
283 | { |
284 | rb_bh_fail("Attempting to rb_bh_create idiotic sizes"); | |
285 | } | |
3202e249 | 286 | |
db137867 AC |
287 | if(elemsize < sizeof(rb_dlink_node)) |
288 | rb_bh_fail("Attempt to rb_bh_create smaller than sizeof(rb_dlink_node)"); | |
3202e249 | 289 | |
db137867 AC |
290 | /* Allocate our new rb_bh */ |
291 | bh = rb_malloc(sizeof(rb_bh)); | |
db137867 | 292 | #ifndef NOBALLOC |
ce1c921c | 293 | elemsize += offset_pad; |
db137867 AC |
294 | if((elemsize % sizeof(void *)) != 0) |
295 | { | |
296 | /* Pad to even pointer boundary */ | |
297 | elemsize += sizeof(void *); | |
298 | elemsize &= ~(sizeof(void *) - 1); | |
299 | } | |
ce1c921c | 300 | #endif |
db137867 AC |
301 | |
302 | bh->elemSize = elemsize; | |
303 | bh->elemsPerBlock = elemsperblock; | |
304 | if(desc != NULL) | |
305 | bh->desc = rb_strdup(desc); | |
306 | ||
307 | #ifndef NOBALLOC | |
308 | /* Be sure our malloc was successful */ | |
309 | if(newblock(bh)) | |
310 | { | |
311 | if(bh != NULL) | |
312 | free(bh); | |
313 | rb_lib_log("newblock() failed"); | |
314 | rb_outofmemory(); /* die.. out of memory */ | |
315 | } | |
316 | #endif /* !NOBALLOC */ | |
317 | ||
318 | if(bh == NULL) | |
319 | { | |
320 | rb_bh_fail("bh == NULL when it shouldn't be"); | |
321 | } | |
322 | rb_dlinkAdd(bh, &bh->hlist, heap_lists); | |
323 | return (bh); | |
324 | } | |
325 | ||
326 | /* ************************************************************************ */ | |
327 | /* FUNCTION DOCUMENTATION: */ | |
328 | /* rb_bh_alloc */ | |
329 | /* Description: */ | |
330 | /* Returns a pointer to a struct within our rb_bh that's free for */ | |
331 | /* the taking. */ | |
332 | /* Parameters: */ | |
333 | /* bh (IN): Pointer to the Blockheap. */ | |
334 | /* Returns: */ | |
335 | /* Pointer to a structure (void *), or NULL if unsuccessful. */ | |
336 | /* ************************************************************************ */ | |
337 | ||
338 | void * | |
3202e249 | 339 | rb_bh_alloc(rb_bh *bh) |
db137867 AC |
340 | { |
341 | #ifndef NOBALLOC | |
342 | rb_dlink_node *new_node; | |
3202e249 | 343 | rb_heap_block **block; |
ce1c921c | 344 | void *ptr; |
3202e249 | 345 | #endif |
db137867 | 346 | lrb_assert(bh != NULL); |
c2ac22cc | 347 | if(rb_unlikely(bh == NULL)) |
db137867 AC |
348 | { |
349 | rb_bh_fail("Cannot allocate if bh == NULL"); | |
350 | } | |
351 | ||
352 | #ifdef NOBALLOC | |
3202e249 | 353 | return (rb_malloc(bh->elemSize)); |
db137867 AC |
354 | #else |
355 | if(bh->free_list.head == NULL) | |
356 | { | |
357 | /* Allocate new block and assign */ | |
358 | /* newblock returns 1 if unsuccessful, 0 if not */ | |
359 | ||
c2ac22cc | 360 | if(rb_unlikely(newblock(bh))) |
db137867 AC |
361 | { |
362 | rb_lib_log("newblock() failed"); | |
363 | rb_outofmemory(); /* Well that didn't work either...bail */ | |
364 | } | |
365 | if(bh->free_list.head == NULL) | |
366 | { | |
367 | rb_lib_log("out of memory after newblock()..."); | |
368 | rb_outofmemory(); | |
369 | } | |
370 | } | |
371 | ||
372 | new_node = bh->free_list.head; | |
3202e249 VY |
373 | block = (rb_heap_block **) new_node->data; |
374 | ptr = (void *)((uintptr_t)new_node->data + (uintptr_t)offset_pad); | |
db137867 | 375 | rb_dlinkDelete(new_node, &bh->free_list); |
3202e249 | 376 | (*block)->free_count--; |
ce1c921c | 377 | memset(ptr, 0, bh->elemSize - offset_pad); |
3202e249 | 378 | return (ptr); |
db137867 AC |
379 | #endif |
380 | } | |
381 | ||
382 | ||
383 | /* ************************************************************************ */ | |
384 | /* FUNCTION DOCUMENTATION: */ | |
385 | /* rb_bh_free */ | |
386 | /* Description: */ | |
387 | /* Returns an element to the free pool, does not free() */ | |
388 | /* Parameters: */ | |
389 | /* bh (IN): Pointer to rb_bh containing element */ | |
390 | /* ptr (in): Pointer to element to be "freed" */ | |
391 | /* Returns: */ | |
392 | /* 0 if successful, 1 if element not contained within rb_bh. */ | |
393 | /* ************************************************************************ */ | |
394 | int | |
3202e249 | 395 | rb_bh_free(rb_bh *bh, void *ptr) |
db137867 AC |
396 | { |
397 | #ifndef NOBALLOC | |
ce1c921c VY |
398 | rb_heap_block *block; |
399 | void *data; | |
db137867 AC |
400 | #endif |
401 | lrb_assert(bh != NULL); | |
402 | lrb_assert(ptr != NULL); | |
403 | ||
c2ac22cc | 404 | if(rb_unlikely(bh == NULL)) |
db137867 | 405 | { |
c2ac22cc | 406 | rb_lib_log("balloc.c:rb_bhFree() bh == NULL"); |
db137867 AC |
407 | return (1); |
408 | } | |
409 | ||
c2ac22cc | 410 | if(rb_unlikely(ptr == NULL)) |
db137867 | 411 | { |
c2ac22cc | 412 | rb_lib_log("balloc.rb_bhFree() ptr == NULL"); |
db137867 AC |
413 | return (1); |
414 | } | |
415 | ||
416 | #ifdef NOBALLOC | |
417 | rb_free(ptr); | |
418 | #else | |
3202e249 VY |
419 | data = (void *)((uintptr_t)ptr - (uintptr_t)offset_pad); |
420 | block = *(rb_heap_block **) data; | |
db137867 | 421 | /* XXX */ |
3202e249 VY |
422 | if(rb_unlikely |
423 | (!((uintptr_t)ptr >= (uintptr_t)block->elems | |
424 | && (uintptr_t)ptr < (uintptr_t)block->elems + (uintptr_t)block->alloc_size))) | |
db137867 AC |
425 | { |
426 | rb_bh_fail("rb_bh_free() bogus pointer"); | |
427 | } | |
ce1c921c | 428 | block->free_count++; |
3202e249 | 429 | |
ce1c921c | 430 | rb_dlinkAdd(data, (rb_dlink_node *)ptr, &bh->free_list); |
db137867 AC |
431 | #endif /* !NOBALLOC */ |
432 | return (0); | |
433 | } | |
434 | ||
435 | ||
436 | /* ************************************************************************ */ | |
437 | /* FUNCTION DOCUMENTATION: */ | |
438 | /* rb_bhDestroy */ | |
439 | /* Description: */ | |
440 | /* Completely free()s a rb_bh. Use for cleanup. */ | |
441 | /* Parameters: */ | |
442 | /* bh (IN): Pointer to the rb_bh to be destroyed. */ | |
443 | /* Returns: */ | |
444 | /* 0 if successful, 1 if bh == NULL */ | |
445 | /* ************************************************************************ */ | |
446 | int | |
3202e249 | 447 | rb_bh_destroy(rb_bh *bh) |
db137867 AC |
448 | { |
449 | #ifndef NOBALLOC | |
450 | rb_dlink_node *ptr, *next; | |
451 | rb_heap_block *b; | |
452 | #endif | |
453 | if(bh == NULL) | |
454 | return (1); | |
455 | ||
456 | #ifndef NOBALLOC | |
457 | RB_DLINK_FOREACH_SAFE(ptr, next, bh->block_list.head) | |
458 | { | |
459 | b = ptr->data; | |
460 | free_block(b->elems, b->alloc_size); | |
461 | rb_free(b); | |
462 | } | |
463 | #endif /* !NOBALLOC */ | |
3202e249 | 464 | |
db137867 AC |
465 | rb_dlinkDelete(&bh->hlist, heap_lists); |
466 | rb_free(bh->desc); | |
467 | rb_free(bh); | |
468 | ||
469 | return (0); | |
470 | } | |
471 | ||
472 | void | |
3202e249 | 473 | rb_bh_usage(rb_bh *bh, size_t *bused, size_t *bfree, size_t *bmemusage, const char **desc) |
db137867 | 474 | { |
3202e249 | 475 | #ifndef NOBALLOC |
db137867 AC |
476 | size_t used, freem, memusage; |
477 | ||
478 | if(bh == NULL) | |
479 | { | |
480 | return; | |
481 | } | |
482 | ||
483 | freem = rb_dlink_list_length(&bh->free_list); | |
484 | used = (rb_dlink_list_length(&bh->block_list) * bh->elemsPerBlock) - freem; | |
ce1c921c | 485 | memusage = used * bh->elemSize; |
db137867 AC |
486 | if(bused != NULL) |
487 | *bused = used; | |
488 | if(bfree != NULL) | |
489 | *bfree = freem; | |
490 | if(bmemusage != NULL) | |
491 | *bmemusage = memusage; | |
492 | if(desc != NULL) | |
493 | *desc = bh->desc; | |
3202e249 VY |
494 | #else |
495 | static char *noballoc = "no blockheap"; | |
496 | *bused = 0; | |
497 | *bfree = 0; | |
498 | *bmemusage = 0; | |
499 | *desc = noballoc; | |
500 | #endif | |
db137867 AC |
501 | } |
502 | ||
3202e249 VY |
503 | void |
504 | rb_bh_usage_all(rb_bh_usage_cb *cb, void *data) | |
db137867 AC |
505 | { |
506 | rb_dlink_node *ptr; | |
507 | rb_bh *bh; | |
508 | size_t used, freem, memusage, heapalloc; | |
509 | static const char *unnamed = "(unnamed_heap)"; | |
510 | const char *desc = unnamed; | |
511 | ||
512 | if(cb == NULL) | |
513 | return; | |
514 | ||
515 | RB_DLINK_FOREACH(ptr, heap_lists->head) | |
516 | { | |
3202e249 | 517 | bh = (rb_bh *)ptr->data; |
db137867 AC |
518 | freem = rb_dlink_list_length(&bh->free_list); |
519 | used = (rb_dlink_list_length(&bh->block_list) * bh->elemsPerBlock) - freem; | |
ce1c921c VY |
520 | memusage = used * bh->elemSize; |
521 | heapalloc = (freem + used) * bh->elemSize; | |
db137867 AC |
522 | if(bh->desc != NULL) |
523 | desc = bh->desc; | |
3202e249 | 524 | cb(used, freem, memusage, heapalloc, desc, data); |
db137867 AC |
525 | } |
526 | return; | |
527 | } | |
528 | ||
529 | void | |
530 | rb_bh_total_usage(size_t *total_alloc, size_t *total_used) | |
531 | { | |
532 | rb_dlink_node *ptr; | |
533 | size_t total_memory = 0, used_memory = 0, used, freem; | |
534 | rb_bh *bh; | |
3202e249 | 535 | |
db137867 AC |
536 | RB_DLINK_FOREACH(ptr, heap_lists->head) |
537 | { | |
538 | bh = (rb_bh *)ptr->data; | |
539 | freem = rb_dlink_list_length(&bh->free_list); | |
540 | used = (rb_dlink_list_length(&bh->block_list) * bh->elemsPerBlock) - freem; | |
ce1c921c VY |
541 | used_memory += used * bh->elemSize; |
542 | total_memory += (freem + used) * bh->elemSize; | |
db137867 | 543 | } |
3202e249 | 544 | |
db137867 AC |
545 | if(total_alloc != NULL) |
546 | *total_alloc = total_memory; | |
547 | if(total_used != NULL) | |
548 | *total_used = used_memory; | |
549 | } | |
550 | ||
551 | #ifndef NOBALLOC | |
552 | int | |
3202e249 | 553 | rb_bh_gc(rb_bh *bh) |
db137867 AC |
554 | { |
555 | rb_heap_block *b; | |
556 | rb_dlink_node *ptr, *next; | |
557 | unsigned long i; | |
558 | uintptr_t offset; | |
3202e249 | 559 | |
db137867 AC |
560 | if(bh == NULL) |
561 | { | |
562 | /* somebody is smoking some craq..(probably lee, but don't tell him that) */ | |
563 | return (1); | |
564 | } | |
565 | ||
3202e249 VY |
566 | if((rb_dlink_list_length(&bh->free_list) < bh->elemsPerBlock) |
567 | || rb_dlink_list_length(&bh->block_list) == 1) | |
db137867 AC |
568 | { |
569 | /* There couldn't possibly be an entire free block. Return. */ | |
570 | return (0); | |
571 | } | |
572 | ||
573 | RB_DLINK_FOREACH_SAFE(ptr, next, bh->block_list.head) | |
574 | { | |
575 | b = ptr->data; | |
576 | if(rb_dlink_list_length(&bh->block_list) == 1) | |
577 | return (0); | |
3202e249 | 578 | |
db137867 AC |
579 | if(b->free_count == bh->elemsPerBlock) |
580 | { | |
581 | /* i'm seriously going to hell for this.. */ | |
582 | ||
583 | offset = (uintptr_t)b->elems; | |
3202e249 | 584 | for(i = 0; i < bh->elemsPerBlock; i++, offset += (uintptr_t)bh->elemSize) |
db137867 | 585 | { |
3202e249 VY |
586 | rb_dlinkDelete((rb_dlink_node *)(offset + offset_pad), |
587 | &bh->free_list); | |
db137867 AC |
588 | } |
589 | rb_dlinkDelete(&b->node, &bh->block_list); | |
590 | free_block(b->elems, b->alloc_size); | |
591 | rb_free(b); | |
592 | } | |
3202e249 | 593 | |
db137867 AC |
594 | } |
595 | return (0); | |
596 | } | |
597 | #endif /* !NOBALLOC */ |