1 |
pippijn |
1.1 |
/** |
2 |
|
|
* balloc.C: Block allocation of memory segments |
3 |
pippijn |
1.2 |
* Rights to this code are documented in doc/pod/license.pod. |
4 |
pippijn |
1.1 |
* |
5 |
|
|
* Copyright © 2005-2007 Atheme Project (http://www.atheme.org) |
6 |
|
|
*/ |
7 |
|
|
|
8 |
pippijn |
1.3 |
static char const rcsid[] = "$Id$"; |
9 |
pippijn |
1.1 |
|
10 |
|
|
#include "atheme.h" |
11 |
|
|
|
12 |
|
|
#ifdef HAVE_MMAP /* We've got mmap() that is good */ |
13 |
|
|
# include <sys/mman.h> |
14 |
|
|
# ifdef MAP_ANONYMOUS |
15 |
|
|
# ifndef MAP_ANON |
16 |
|
|
# define MAP_ANON MAP_ANONYMOUS |
17 |
|
|
# endif |
18 |
|
|
# endif |
19 |
|
|
#else |
20 |
|
|
# define MAP_PRIVATE 0 |
21 |
|
|
# define MAP_ANON 0 |
22 |
|
|
# define MAP_FAILED 0 |
23 |
|
|
# define PROT_READ 0 |
24 |
|
|
# define PROT_WRITE 0 |
25 |
|
|
#endif |
26 |
|
|
|
27 |
|
|
static int newblock (BlockHeap *bh); |
28 |
|
|
static int BlockHeapGarbageCollect (BlockHeap *); |
29 |
|
|
static void block_heap_gc (void *unused); |
30 |
|
|
static list_t heap_lists; |
31 |
|
|
|
32 |
|
|
#define blockheap_fail(x) _blockheap_fail(x, __FILE__, __LINE__) |
33 |
|
|
|
34 |
|
|
static void |
35 |
|
|
_blockheap_fail (const char *reason, const char *file, int line) |
36 |
|
|
{ |
37 |
|
|
slog (LG_INFO, "Blockheap failure: %s (%s:%d)", reason, file, line); |
38 |
|
|
runflags |= RF_SHUTDOWN; |
39 |
|
|
} |
40 |
|
|
|
41 |
|
|
#ifndef HAVE_MMAP |
42 |
|
|
/* |
43 |
|
|
* static void mmap(void *hint, size_t len, unsigned int prot, |
44 |
|
|
* unsigned int flags, unsigned int fd, unsigned int off) |
45 |
|
|
* |
46 |
|
|
* Inputs - mmap style arguments. |
47 |
|
|
* Output - None |
48 |
|
|
* Side Effects - Memory is allocated to the block allocator. |
49 |
|
|
*/ |
50 |
|
|
static void * |
51 |
|
|
mmap (void *hint, size_t len, unsigned int prot, unsigned int flags, unsigned int fd, unsigned int off) |
52 |
|
|
{ |
53 |
|
|
void *ptr = smalloc (len); |
54 |
|
|
|
55 |
|
|
if (!ptr) |
56 |
|
|
blockheap_fail ("smalloc() failed."); |
57 |
|
|
|
58 |
|
|
memset (ptr, 0, len); |
59 |
|
|
|
60 |
|
|
return ptr; |
61 |
|
|
} |
62 |
|
|
|
63 |
|
|
/* |
64 |
|
|
* static void munmap(void *addr, size_t len) |
65 |
|
|
* |
66 |
|
|
* Inputs - munmap style arguments. |
67 |
|
|
* Output - None |
68 |
|
|
* Side Effects - Memory is returned back to the OS. |
69 |
|
|
*/ |
70 |
|
|
static void |
71 |
|
|
munmap (void *addr, size_t len) |
72 |
|
|
{ |
73 |
|
|
if (!addr) |
74 |
|
|
blockheap_fail ("no address to unmap."); |
75 |
|
|
|
76 |
|
|
free (addr); |
77 |
|
|
} |
78 |
|
|
#endif |
79 |
|
|
|
80 |
|
|
/* |
81 |
|
|
* static void free_block(void *ptr, size_t size) |
82 |
|
|
* |
83 |
|
|
* Inputs: The block and its size |
84 |
|
|
* Output: None |
85 |
|
|
* Side Effects: Returns memory for the block back to the OS |
86 |
|
|
*/ |
87 |
|
|
static void |
88 |
|
|
free_block (void *ptr, size_t size) |
89 |
|
|
{ |
90 |
|
|
munmap (ptr, size); |
91 |
|
|
} |
92 |
|
|
|
93 |
|
|
|
94 |
|
|
/* |
95 |
|
|
* void initBlockHeap(void) |
96 |
|
|
* |
97 |
|
|
* Inputs: None |
98 |
|
|
* Outputs: None |
99 |
|
|
* Side Effects: Initializes the block heap |
100 |
|
|
*/ |
101 |
|
|
|
102 |
|
|
void |
103 |
|
|
initBlockHeap (void) |
104 |
|
|
{ |
105 |
|
|
#ifndef NOBALLOC |
106 |
|
|
event_add ("block_heap_gc", block_heap_gc, NULL, 60); |
107 |
|
|
#endif |
108 |
|
|
} |
109 |
|
|
|
110 |
|
|
#ifndef NOBALLOC |
111 |
|
|
/* |
112 |
|
|
* static void *get_block(size_t size) |
113 |
|
|
* |
114 |
|
|
* Input: Size of block to allocate |
115 |
|
|
* Output: Pointer to new block |
116 |
|
|
* Side Effects: None |
117 |
|
|
*/ |
118 |
|
|
static void * |
119 |
|
|
get_block (size_t size) |
120 |
|
|
{ |
121 |
|
|
void *ptr; |
122 |
|
|
ptr = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); |
123 |
|
|
|
124 |
|
|
if (ptr == MAP_FAILED) |
125 |
|
|
ptr = NULL; |
126 |
|
|
|
127 |
|
|
return (ptr); |
128 |
|
|
} |
129 |
|
|
|
130 |
|
|
|
131 |
|
|
static void |
132 |
|
|
block_heap_gc (void *unused) |
133 |
|
|
{ |
134 |
|
|
node_t *ptr, *tptr; |
135 |
|
|
|
136 |
|
|
LIST_FOREACH_SAFE (ptr, tptr, heap_lists.head) |
137 |
|
|
{ |
138 |
|
|
BlockHeapGarbageCollect (static_cast<BlockHeap *> (ptr->data)); |
139 |
|
|
} |
140 |
|
|
} |
141 |
|
|
|
142 |
|
|
/* ************************************************************************ */ |
143 |
|
|
/* FUNCTION DOCUMENTATION: */ |
144 |
|
|
/* newblock */ |
145 |
|
|
/* Description: */ |
146 |
|
|
/* Allocates a new block for addition to a blockheap */ |
147 |
|
|
/* Parameters: */ |
148 |
|
|
/* bh (IN): Pointer to parent blockheap. */ |
149 |
|
|
/* Returns: */ |
150 |
|
|
/* 0 if successful, 1 if not */ |
151 |
|
|
/* ************************************************************************ */ |
152 |
|
|
|
153 |
|
|
static int |
154 |
|
|
newblock (BlockHeap *bh) |
155 |
|
|
{ |
156 |
|
|
MemBlock *newblk; |
157 |
|
|
Block *b; |
158 |
|
|
unsigned long i; |
159 |
|
|
void *offset; |
160 |
|
|
|
161 |
|
|
/* Setup the initial data structure. */ |
162 |
|
|
b = (Block *) scalloc (1, sizeof (Block)); |
163 |
|
|
|
164 |
|
|
if (b == NULL) |
165 |
|
|
return (1); |
166 |
|
|
|
167 |
|
|
b->free_list.head = b->free_list.tail = NULL; |
168 |
|
|
b->used_list.head = b->used_list.tail = NULL; |
169 |
|
|
b->next = bh->base; |
170 |
|
|
|
171 |
|
|
b->alloc_size = (bh->elemsPerBlock + 1) * (bh->elemSize + sizeof (MemBlock)); |
172 |
|
|
|
173 |
|
|
b->elems = get_block (b->alloc_size); |
174 |
|
|
|
175 |
|
|
if (b->elems == NULL) |
176 |
|
|
return (1); |
177 |
|
|
|
178 |
|
|
offset = b->elems; |
179 |
|
|
|
180 |
|
|
/* Setup our blocks now */ |
181 |
|
|
for (i = 0; i < bh->elemsPerBlock; i++) |
182 |
|
|
{ |
183 |
|
|
void *data; |
184 |
|
|
newblk = static_cast<MemBlock *> (offset); |
185 |
|
|
newblk->block = b; |
186 |
|
|
#ifdef DEBUG_BALLOC |
187 |
|
|
newblk->magic = BALLOC_MAGIC; |
188 |
|
|
#endif |
189 |
|
|
data = (void *) ((size_t) offset + sizeof (MemBlock)); |
190 |
|
|
newblk->block = b; |
191 |
|
|
node_add (data, &newblk->self, &b->free_list); |
192 |
|
|
offset = (unsigned char *) ((unsigned char *) offset + bh->elemSize + sizeof (MemBlock)); |
193 |
|
|
} |
194 |
|
|
|
195 |
|
|
++bh->blocksAllocated; |
196 |
|
|
bh->freeElems += bh->elemsPerBlock; |
197 |
|
|
bh->base = b; |
198 |
|
|
|
199 |
|
|
return (0); |
200 |
|
|
} |
201 |
|
|
#endif |
202 |
|
|
|
203 |
|
|
/* ************************************************************************ */ |
204 |
|
|
/* FUNCTION DOCUMENTATION: */ |
205 |
|
|
/* BlockHeapCreate */ |
206 |
|
|
/* Description: */ |
207 |
|
|
/* Creates a new blockheap from which smaller blocks can be allocated. */ |
208 |
|
|
/* Intended to be used instead of multiple calls to malloc() when */ |
209 |
|
|
/* performance is an issue. */ |
210 |
|
|
/* Parameters: */ |
211 |
|
|
/* elemsize (IN): Size of the basic element to be stored */ |
212 |
|
|
/* elemsperblock (IN): Number of elements to be stored in a single block */ |
213 |
|
|
/* of memory. When the blockheap runs out of free memory, it will */ |
214 |
|
|
/* allocate elemsize * elemsperblock more. */ |
215 |
|
|
/* Returns: */ |
216 |
|
|
/* Pointer to new BlockHeap, or NULL if unsuccessful */ |
217 |
|
|
/* ************************************************************************ */ |
218 |
|
|
BlockHeap * |
219 |
|
|
BlockHeapCreate (size_t elemsize, int elemsperblock) |
220 |
|
|
{ |
221 |
|
|
BlockHeap *bh; |
222 |
|
|
|
223 |
|
|
/* Catch idiotic requests up front */ |
224 |
|
|
if ((elemsize <= 0) || (elemsperblock <= 0)) |
225 |
|
|
{ |
226 |
|
|
blockheap_fail ("Attempting to BlockHeapCreate idiotic sizes"); |
227 |
|
|
} |
228 |
|
|
|
229 |
|
|
/* Allocate our new BlockHeap */ |
230 |
|
|
bh = (BlockHeap *) scalloc (1, sizeof (BlockHeap)); |
231 |
|
|
|
232 |
|
|
if (bh == NULL) |
233 |
|
|
{ |
234 |
|
|
slog (LG_INFO, "Attempt to calloc() failed: (%s:%d)", __FILE__, __LINE__); |
235 |
|
|
runflags |= RF_SHUTDOWN; |
236 |
|
|
} |
237 |
|
|
|
238 |
|
|
#ifndef NOBALLOC |
239 |
|
|
if ((elemsize % sizeof (void *)) != 0) |
240 |
|
|
{ |
241 |
|
|
/* Pad to even pointer boundary */ |
242 |
|
|
elemsize += sizeof (void *); |
243 |
|
|
elemsize &= ~(sizeof (void *) - 1); |
244 |
|
|
} |
245 |
|
|
#endif |
246 |
|
|
|
247 |
|
|
bh->elemSize = elemsize; |
248 |
|
|
bh->elemsPerBlock = elemsperblock; |
249 |
|
|
bh->blocksAllocated = 0; |
250 |
|
|
bh->freeElems = 0; |
251 |
|
|
bh->base = NULL; |
252 |
|
|
|
253 |
|
|
#ifndef NOBALLOC |
254 |
|
|
/* Be sure our malloc was successful */ |
255 |
|
|
if (newblock (bh)) |
256 |
|
|
{ |
257 |
|
|
if (bh != NULL) |
258 |
|
|
free (bh); |
259 |
|
|
slog (LG_INFO, "newblock() failed"); |
260 |
|
|
runflags |= RF_SHUTDOWN; |
261 |
|
|
} |
262 |
|
|
#endif |
263 |
|
|
|
264 |
|
|
if (bh == NULL) |
265 |
|
|
{ |
266 |
|
|
blockheap_fail ("bh == NULL when it shouldn't be"); |
267 |
|
|
} |
268 |
|
|
node_add (bh, &bh->hlist, &heap_lists); |
269 |
|
|
return (bh); |
270 |
|
|
} |
271 |
|
|
|
272 |
|
|
/* ************************************************************************ */ |
273 |
|
|
/* FUNCTION DOCUMENTATION: */ |
274 |
|
|
/* BlockHeapAlloc */ |
275 |
|
|
/* Description: */ |
276 |
|
|
/* Returns a pointer to a struct within our BlockHeap that's free for */ |
277 |
|
|
/* the taking. */ |
278 |
|
|
/* Parameters: */ |
279 |
|
|
/* bh (IN): Pointer to the Blockheap. */ |
280 |
|
|
/* Returns: */ |
281 |
|
|
/* Pointer to a structure (void *), or NULL if unsuccessful. */ |
282 |
|
|
/* ************************************************************************ */ |
283 |
|
|
|
284 |
|
|
void * |
285 |
|
|
BlockHeapAlloc (BlockHeap *bh) |
286 |
|
|
{ |
287 |
|
|
Block *walker; |
288 |
|
|
node_t *new_node; |
289 |
|
|
|
290 |
|
|
if (bh == NULL) |
291 |
|
|
{ |
292 |
|
|
blockheap_fail ("Cannot allocate if bh == NULL"); |
293 |
|
|
} |
294 |
|
|
|
295 |
|
|
#ifdef NOBALLOC |
296 |
|
|
return smalloc (bh->elemSize); |
297 |
|
|
#else |
298 |
|
|
if (bh->freeElems == 0) |
299 |
|
|
{ |
300 |
|
|
/* Allocate new block and assign */ |
301 |
|
|
/* newblock returns 1 if unsuccessful, 0 if not */ |
302 |
|
|
|
303 |
|
|
if (newblock (bh)) |
304 |
|
|
{ |
305 |
|
|
/* That didn't work..try to garbage collect */ |
306 |
|
|
BlockHeapGarbageCollect (bh); |
307 |
|
|
if (bh->freeElems == 0) |
308 |
|
|
{ |
309 |
|
|
slog (LG_INFO, "newblock() failed and garbage collection didn't help"); |
310 |
|
|
runflags |= RF_SHUTDOWN; |
311 |
|
|
} |
312 |
|
|
} |
313 |
|
|
} |
314 |
|
|
|
315 |
|
|
for (walker = bh->base; walker != NULL; walker = walker->next) |
316 |
|
|
{ |
317 |
|
|
if (LIST_LENGTH (&walker->free_list) > 0) |
318 |
|
|
{ |
319 |
|
|
bh->freeElems--; |
320 |
|
|
new_node = walker->free_list.head; |
321 |
|
|
node_move (new_node, &walker->free_list, &walker->used_list); |
322 |
|
|
if (new_node->data == NULL) |
323 |
|
|
blockheap_fail ("new_node->data is NULL and that shouldn't happen!!!"); |
324 |
|
|
memset (new_node->data, 0, bh->elemSize); |
325 |
|
|
return (new_node->data); |
326 |
|
|
} |
327 |
|
|
} |
328 |
|
|
blockheap_fail ("BlockHeapAlloc failed, giving up"); |
329 |
|
|
return NULL; |
330 |
|
|
#endif |
331 |
|
|
} |
332 |
|
|
|
333 |
|
|
|
334 |
|
|
/* ************************************************************************ */ |
335 |
|
|
/* FUNCTION DOCUMENTATION: */ |
336 |
|
|
/* BlockHeapFree */ |
337 |
|
|
/* Description: */ |
338 |
|
|
/* Returns an element to the free pool, does not free() */ |
339 |
|
|
/* Parameters: */ |
340 |
|
|
/* bh (IN): Pointer to BlockHeap containing element */ |
341 |
|
|
/* ptr (in): Pointer to element to be "freed" */ |
342 |
|
|
/* Returns: */ |
343 |
|
|
/* 0 if successful, 1 if element not contained within BlockHeap. */ |
344 |
|
|
/* ************************************************************************ */ |
345 |
|
|
int |
346 |
|
|
BlockHeapFree (BlockHeap *bh, void *ptr) |
347 |
|
|
{ |
348 |
|
|
Block *block; |
349 |
|
|
struct MemBlock *memblock; |
350 |
|
|
|
351 |
|
|
if (bh == NULL) |
352 |
|
|
{ |
353 |
|
|
|
354 |
|
|
slog (LG_DEBUG, "balloc.c:BlockHeapFree() bh == NULL"); |
355 |
|
|
return (1); |
356 |
|
|
} |
357 |
|
|
|
358 |
|
|
if (ptr == NULL) |
359 |
|
|
{ |
360 |
|
|
slog (LG_DEBUG, "balloc.c:BlockHeapFree() ptr == NULL"); |
361 |
|
|
return (1); |
362 |
|
|
} |
363 |
|
|
|
364 |
|
|
#ifdef NOBALLOC |
365 |
|
|
free (ptr); |
366 |
|
|
#else |
367 |
|
|
memblock = static_cast<MemBlock *> ((void *) ((size_t) ptr - sizeof (MemBlock))); |
368 |
|
|
#ifdef DEBUG_BALLOC |
369 |
|
|
if (memblock->magic != BALLOC_MAGIC) |
370 |
|
|
{ |
371 |
|
|
blockheap_fail ("memblock->magic != BALLOC_MAGIC"); |
372 |
|
|
runflags |= RF_SHUTDOWN; |
373 |
|
|
} |
374 |
|
|
#endif |
375 |
|
|
if (memblock->block == NULL) |
376 |
|
|
{ |
377 |
|
|
blockheap_fail ("memblock->block == NULL, not a valid block?"); |
378 |
|
|
runflags |= RF_SHUTDOWN; |
379 |
|
|
} |
380 |
|
|
|
381 |
|
|
block = memblock->block; |
382 |
|
|
bh->freeElems++; |
383 |
|
|
node_move (&memblock->self, &block->used_list, &block->free_list); |
384 |
|
|
#endif |
385 |
|
|
return (0); |
386 |
|
|
} |
387 |
|
|
|
388 |
|
|
/* ************************************************************************ */ |
389 |
|
|
/* FUNCTION DOCUMENTATION: */ |
390 |
|
|
/* BlockHeapGarbageCollect */ |
391 |
|
|
/* Description: */ |
392 |
|
|
/* Performs garbage collection on the block heap. Any blocks that are */ |
393 |
|
|
/* completely unallocated are removed from the heap. Garbage collection */ |
394 |
|
|
/* will never remove the root node of the heap. */ |
395 |
|
|
/* Parameters: */ |
396 |
|
|
/* bh (IN): Pointer to the BlockHeap to be cleaned up */ |
397 |
|
|
/* Returns: */ |
398 |
|
|
/* 0 if successful, 1 if bh == NULL */ |
399 |
|
|
/* ************************************************************************ */ |
400 |
|
|
static int |
401 |
|
|
BlockHeapGarbageCollect (BlockHeap *bh) |
402 |
|
|
{ |
403 |
|
|
#ifndef NOBALLOC |
404 |
|
|
Block *walker, *last; |
405 |
|
|
if (bh == NULL) |
406 |
|
|
{ |
407 |
|
|
return (1); |
408 |
|
|
} |
409 |
|
|
|
410 |
|
|
if (bh->freeElems < bh->elemsPerBlock || bh->blocksAllocated == 1) |
411 |
|
|
{ |
412 |
|
|
/* There couldn't possibly be an entire free block. Return. */ |
413 |
|
|
return (0); |
414 |
|
|
} |
415 |
|
|
|
416 |
|
|
last = NULL; |
417 |
|
|
walker = bh->base; |
418 |
|
|
|
419 |
|
|
while (walker != NULL) |
420 |
|
|
{ |
421 |
|
|
if ((LIST_LENGTH (&walker->free_list) == bh->elemsPerBlock) != 0) |
422 |
|
|
{ |
423 |
|
|
free_block (walker->elems, walker->alloc_size); |
424 |
|
|
if (last != NULL) |
425 |
|
|
{ |
426 |
|
|
last->next = walker->next; |
427 |
|
|
if (walker != NULL) |
428 |
|
|
free (walker); |
429 |
|
|
walker = last->next; |
430 |
|
|
} |
431 |
|
|
else |
432 |
|
|
{ |
433 |
|
|
bh->base = walker->next; |
434 |
|
|
if (walker != NULL) |
435 |
|
|
free (walker); |
436 |
|
|
walker = bh->base; |
437 |
|
|
} |
438 |
|
|
bh->blocksAllocated--; |
439 |
|
|
bh->freeElems -= bh->elemsPerBlock; |
440 |
|
|
} |
441 |
|
|
else |
442 |
|
|
{ |
443 |
|
|
last = walker; |
444 |
|
|
walker = walker->next; |
445 |
|
|
} |
446 |
|
|
} |
447 |
|
|
return (0); |
448 |
|
|
#endif |
449 |
|
|
} |
450 |
|
|
|
451 |
|
|
/* ************************************************************************ */ |
452 |
|
|
/* FUNCTION DOCUMENTATION: */ |
453 |
|
|
/* BlockHeapDestroy */ |
454 |
|
|
/* Description: */ |
455 |
|
|
/* Completely free()s a BlockHeap. Use for cleanup. */ |
456 |
|
|
/* Parameters: */ |
457 |
|
|
/* bh (IN): Pointer to the BlockHeap to be destroyed. */ |
458 |
|
|
/* Returns: */ |
459 |
|
|
/* 0 if successful, 1 if bh == NULL */ |
460 |
|
|
/* ************************************************************************ */ |
461 |
|
|
int |
462 |
|
|
BlockHeapDestroy (BlockHeap *bh) |
463 |
|
|
{ |
464 |
|
|
Block *walker, *next; |
465 |
|
|
|
466 |
|
|
if (bh == NULL) |
467 |
|
|
{ |
468 |
|
|
return (1); |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
#ifndef NOBALLOC |
472 |
|
|
for (walker = bh->base; walker != NULL; walker = next) |
473 |
|
|
{ |
474 |
|
|
next = walker->next; |
475 |
|
|
free_block (walker->elems, walker->alloc_size); |
476 |
|
|
if (walker != NULL) |
477 |
|
|
free (walker); |
478 |
|
|
} |
479 |
|
|
#endif |
480 |
|
|
node_del (&bh->hlist, &heap_lists); |
481 |
|
|
free (bh); |
482 |
|
|
return (0); |
483 |
|
|
} |
484 |
|
|
|
485 |
|
|
void |
486 |
|
|
BlockHeapUsage (BlockHeap *bh, size_t * bused, size_t * bfree, size_t * bmemusage) |
487 |
|
|
{ |
488 |
|
|
size_t used; |
489 |
|
|
size_t freem; |
490 |
|
|
size_t memusage; |
491 |
|
|
if (bh == NULL) |
492 |
|
|
{ |
493 |
|
|
return; |
494 |
|
|
} |
495 |
|
|
|
496 |
|
|
#ifdef NOBALLOC |
497 |
|
|
freem = used = memusage = 0; |
498 |
|
|
#else |
499 |
|
|
freem = bh->freeElems; |
500 |
|
|
used = (bh->blocksAllocated * bh->elemsPerBlock) - bh->freeElems; |
501 |
|
|
memusage = used * (bh->elemSize + sizeof (MemBlock)); |
502 |
|
|
#endif |
503 |
|
|
|
504 |
|
|
if (bused != NULL) |
505 |
|
|
*bused = used; |
506 |
|
|
if (bfree != NULL) |
507 |
|
|
*bfree = freem; |
508 |
|
|
if (bmemusage != NULL) |
509 |
|
|
*bmemusage = memusage; |
510 |
|
|
} |