mem.c 35.3 KB
Newer Older
Bob Halley's avatar
base  
Bob Halley committed
1
/*
David Lawrence's avatar
David Lawrence committed
2
 * Copyright (C) 1997-2000  Internet Software Consortium.
3
 *
Bob Halley's avatar
base  
Bob Halley committed
4 5 6
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
7
 *
8 9 10 11 12 13 14 15
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Bob Halley's avatar
base  
Bob Halley committed
16 17
 */

18
/* $Id: mem.c,v 1.70 2000/12/06 20:32:12 tale Exp $ */
David Lawrence's avatar
David Lawrence committed
19

Bob Halley's avatar
Bob Halley committed
20
#include <config.h>
Bob Halley's avatar
base  
Bob Halley committed
21 22 23

#include <stdio.h>
#include <stdlib.h>
Bob Halley's avatar
Bob Halley committed
24
#include <stddef.h>
Bob Halley's avatar
base  
Bob Halley committed
25

Michael Graff's avatar
Michael Graff committed
26 27
#include <limits.h>

Bob Halley's avatar
Bob Halley committed
28
#include <isc/mem.h>
29
#include <isc/msgs.h>
30
#include <isc/ondestroy.h>
31
#include <isc/string.h>
Bob Halley's avatar
Bob Halley committed
32

Bob Halley's avatar
update  
Bob Halley committed
33
#include <isc/mutex.h>
Michael Graff's avatar
Michael Graff committed
34
#include <isc/util.h>
Bob Halley's avatar
update  
Bob Halley committed
35

Michael Graff's avatar
Michael Graff committed
36
unsigned int isc_mem_debugging = 0;
37 38 39 40 41 42 43 44 45 46

/*
 * Constants.
 */

#define DEF_MAX_SIZE		1100
#define DEF_MEM_TARGET		4096
#define ALIGNMENT_SIZE		8
#define NUM_BASIC_BLOCKS	64			/* must be > 1 */
#define TABLE_INCREMENT		1024
Michael Graff's avatar
Michael Graff committed
47
#define DEBUGLIST_COUNT		1024
48

Bob Halley's avatar
base  
Bob Halley committed
49 50 51
/*
 * Types.
 */
52
#if ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
53 54 55 56 57 58 59 60
typedef struct debuglink debuglink_t;
struct debuglink {
	ISC_LINK(debuglink_t)	link;
	const void	       *ptr[DEBUGLIST_COUNT];
	const char	       *file[DEBUGLIST_COUNT];
	unsigned int		line[DEBUGLIST_COUNT];
	unsigned int		count;
};
Bob Halley's avatar
base  
Bob Halley committed
61

Michael Graff's avatar
Michael Graff committed
62 63 64 65 66 67
#define FLARG_PASS	, file, line
#define FLARG		, const char *file, int line
#else
#define FLARG_PASS
#define FLARG
#endif
68

Michael Graff's avatar
Michael Graff committed
69
typedef struct element element;
70 71 72
struct element {
	element *		next;
};
Bob Halley's avatar
base  
Bob Halley committed
73 74 75 76 77

typedef struct {
	/*
	 * This structure must be ALIGNMENT_SIZE bytes.
	 */
78 79 80 81
	union {
		size_t		size;
		char		bytes[ALIGNMENT_SIZE];
	} u;
Bob Halley's avatar
Bob Halley committed
82
} size_info;
Bob Halley's avatar
base  
Bob Halley committed
83 84

struct stats {
Bob Halley's avatar
Bob Halley committed
85 86 87 88
	unsigned long		gets;
	unsigned long		totalgets;
	unsigned long		blocks;
	unsigned long		freefrags;
Bob Halley's avatar
base  
Bob Halley committed
89 90
};

91 92
#define MEM_MAGIC		0x4D656d43U	/* MemC. */
#define VALID_CONTEXT(c)	((c) != NULL && (c)->magic == MEM_MAGIC)
Bob Halley's avatar
Bob Halley committed
93

94
struct isc_mem {
Bob Halley's avatar
Bob Halley committed
95
	unsigned int		magic;
96
	isc_ondestroy_t		ondestroy;
Bob Halley's avatar
Bob Halley committed
97
	isc_mutex_t		lock;
98 99 100
	isc_memalloc_t		memalloc;
	isc_memfree_t		memfree;
	void *			arg;
Bob Halley's avatar
base  
Bob Halley committed
101 102
	size_t			max_size;
	size_t			mem_target;
Bob Halley's avatar
Bob Halley committed
103 104
	element **		freelists;
	element *		basic_blocks;
105 106 107
	unsigned char **	basic_table;
	unsigned int		basic_table_count;
	unsigned int		basic_table_size;
Bob Halley's avatar
Bob Halley committed
108 109
	unsigned char *		lowest;
	unsigned char *		highest;
110
	isc_boolean_t		checkfree;
111
	isc_boolean_t		trysplit;
Bob Halley's avatar
base  
Bob Halley committed
112
	struct stats *		stats;
113
	unsigned int		references;
114
	size_t			quota;
Bob Halley's avatar
Bob Halley committed
115
	size_t			total;
116
	size_t			inuse;
117 118 119 120 121
	size_t			hi_water;
	size_t			lo_water;
	isc_boolean_t		hi_called;
	isc_mem_water_t		water;
	void *			water_arg;
Michael Graff's avatar
Michael Graff committed
122
	ISC_LIST(isc_mempool_t)	pools;
123
#if ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
124 125
	ISC_LIST(debuglink_t)	debuglist;
#endif
Michael Graff's avatar
Michael Graff committed
126 127 128 129 130 131
};

#define MEMPOOL_MAGIC		0x4D454d70U	/* MEMp. */
#define VALID_MEMPOOL(c)	((c) != NULL && (c)->magic == MEMPOOL_MAGIC)

struct isc_mempool {
Michael Graff's avatar
Michael Graff committed
132
	/* always unlocked */
Michael Graff's avatar
Michael Graff committed
133
	unsigned int	magic;		/* magic number */
Michael Graff's avatar
Michael Graff committed
134
	isc_mutex_t    *lock;		/* optional lock */
Michael Graff's avatar
Michael Graff committed
135
	isc_mem_t      *mctx;		/* our memory context */
Michael Graff's avatar
Michael Graff committed
136 137 138
	/* locked via the memory context's lock */
	ISC_LINK(isc_mempool_t)	link;	/* next pool in this mem context */
	/* optionally locked from here down */
Michael Graff's avatar
Michael Graff committed
139 140 141 142 143 144 145 146 147
	element	       *items;		/* low water item list */
	size_t		size;		/* size of each item on this pool */
	unsigned int	maxalloc;	/* max number of items allowed */
	unsigned int	allocated;	/* # of items currently given out */
	unsigned int	freecount;	/* # of items on reserved list */
	unsigned int	freemax;	/* # of items allowed on free list */
	unsigned int	fillcount;	/* # of items to fetch on each fill */
	/* Stats only. */
	unsigned int	gets;		/* # of requests to this pool */
Michael Graff's avatar
Michael Graff committed
148
	/* Debugging only. */
149
#if ISC_MEMPOOL_NAMES
Michael Graff's avatar
Michael Graff committed
150 151
	char		name[16];	/* printed name in stats reports */
#endif
Bob Halley's avatar
base  
Bob Halley committed
152 153
};

154 155 156
/*
 * Private Inline-able.
 */
Bob Halley's avatar
base  
Bob Halley committed
157

158
#if ! ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
159 160 161 162 163 164 165 166 167 168 169 170 171 172
#define ADD_TRACE(a, b, c, d, e)
#define DELETE_TRACE(a, b, c, d, e)
#else
#define ADD_TRACE(a, b, c, d, e)	add_trace_entry(a, b, c, d, e)
#define DELETE_TRACE(a, b, c, d, e)	delete_trace_entry(a, b, c, d, e)

#define MEM_TRACE	((isc_mem_debugging & ISC_MEM_DEBUGTRACE) != 0)
#define MEM_RECORD	((isc_mem_debugging & ISC_MEM_DEBUGRECORD) != 0)

/*
 * mctx must be locked.
 */
static inline void
add_trace_entry(isc_mem_t *mctx, const void *ptr, unsigned int size
Michael Graff's avatar
pasto  
Michael Graff committed
173
		FLARG)
Michael Graff's avatar
Michael Graff committed
174 175 176 177 178
{
	debuglink_t *dl;
	unsigned int i;

	if (MEM_TRACE)
179 180 181 182
		fprintf(stderr, isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
					       ISC_MSG_ADDTRACE,
					       "add %p size %u "
					       "file %s line %u mctx %p\n"),
183
			ptr, size, file, line, mctx);
Michael Graff's avatar
Michael Graff committed
184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230

	if (!MEM_RECORD)
		return;

	dl = ISC_LIST_HEAD(mctx->debuglist);
	while (dl != NULL) {
		if (dl->count == DEBUGLIST_COUNT)
			goto next;
		for (i = 0 ; i < DEBUGLIST_COUNT ; i++) {
			if (dl->ptr[i] == NULL) {
				dl->ptr[i] = ptr;
				dl->file[i] = file;
				dl->line[i] = line;
				dl->count++;
				return;
			}
		}
	next:
		dl = ISC_LIST_NEXT(dl, link);
	}

	dl = malloc(sizeof(debuglink_t));
	INSIST(dl != NULL);

	ISC_LINK_INIT(dl, link);
	for (i = 1 ; i < DEBUGLIST_COUNT ; i++) {
		dl->ptr[i] = NULL;
		dl->file[i] = NULL;
		dl->line[i] = 0;
	}

	dl->ptr[0] = ptr;
	dl->file[0] = file;
	dl->line[0] = line;
	dl->count = 1;

	ISC_LIST_PREPEND(mctx->debuglist, dl, link);
}

static inline void
delete_trace_entry(isc_mem_t *mctx, const void *ptr, unsigned int size,
		   const char *file, unsigned int line)
{
	debuglink_t *dl;
	unsigned int i;

	if (MEM_TRACE)
231 232 233 234
		fprintf(stderr, isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
					       ISC_MSG_DELTRACE,
					       "del %p size %u "
					       "file %s line %u mctx %p\n"),
235
			ptr, size, file, line, mctx);
Michael Graff's avatar
Michael Graff committed
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268

	if (!MEM_RECORD)
		return;

	dl = ISC_LIST_HEAD(mctx->debuglist);
	while (dl != NULL) {
		for (i = 0 ; i < DEBUGLIST_COUNT ; i++) {
			if (dl->ptr[i] == ptr) {
				dl->ptr[i] = NULL;
				dl->file[i] = NULL;
				dl->line[i] = 0;

				INSIST(dl->count > 0);
				dl->count--;
				if (dl->count == 0) {
					ISC_LIST_UNLINK(mctx->debuglist,
							dl, link);
					free(dl);
				}
				return;
			}
		}
		dl = ISC_LIST_NEXT(dl, link);
	}

	/*
	 * If we get here, we didn't find the item on the list.  We're
	 * screwed.
	 */
	INSIST(dl != NULL);
}
#endif /* ISC_MEM_TRACKLINES */

269 270 271 272 273 274 275 276 277
static inline size_t
rmsize(size_t size) {
	/*
 	 * round down to ALIGNMENT_SIZE
	 */
	size -= (size % ALIGNMENT_SIZE);
	return (size);
}

278
static inline size_t
Bob Halley's avatar
base  
Bob Halley committed
279
quantize(size_t size) {
280
	int temp;
Bob Halley's avatar
base  
Bob Halley committed
281 282

	/*
283
	 * Round up the result in order to get a size big
Bob Halley's avatar
base  
Bob Halley committed
284 285 286
	 * enough to satisfy the request and be aligned on ALIGNMENT_SIZE
	 * byte boundaries.
	 */
287

288 289
	if (size == 0)
		return (ALIGNMENT_SIZE);
Mark Andrews's avatar
Mark Andrews committed
290
	temp = size + (ALIGNMENT_SIZE - 1);
291
	return (temp - temp % ALIGNMENT_SIZE);
Bob Halley's avatar
base  
Bob Halley committed
292 293
}

David Lawrence's avatar
David Lawrence committed
294 295 296 297
static inline void
split(isc_mem_t *ctx, size_t size, size_t new_size) {
	unsigned char *ptr;
	size_t remaining_size;
Michael Graff's avatar
Michael Graff committed
298

David Lawrence's avatar
David Lawrence committed
299 300 301 302 303 304
	/*
	 * Unlink a frag of size 'size'.
	 */
	ptr = (unsigned char *)ctx->freelists[size];
	ctx->freelists[size] = ctx->freelists[size]->next;
	ctx->stats[size].freefrags--;
Michael Graff's avatar
Michael Graff committed
305

David Lawrence's avatar
David Lawrence committed
306 307 308 309 310 311
	/*
	 * Create a frag of size 'new_size' and link it in.
	 */
	((element *)ptr)->next = ctx->freelists[new_size];
	ctx->freelists[new_size] = (element *)ptr;
	ctx->stats[new_size].freefrags++;
Bob Halley's avatar
base  
Bob Halley committed
312

David Lawrence's avatar
David Lawrence committed
313 314 315 316 317 318 319 320
	/*
	 * Create a frag of size 'size - new_size' and link it in.
	 */
	remaining_size = size - new_size;
	ptr += new_size;
	((element *)ptr)->next = ctx->freelists[remaining_size];
	ctx->freelists[remaining_size] = (element *)ptr;
	ctx->stats[remaining_size].freefrags++;
321 322
}

David Lawrence's avatar
David Lawrence committed
323 324 325
static inline isc_boolean_t
try_split(isc_mem_t *ctx, size_t new_size) {
	size_t i, doubled_size;
326

David Lawrence's avatar
David Lawrence committed
327 328
	if (!ctx->trysplit)
		return (ISC_FALSE);
Michael Graff's avatar
Michael Graff committed
329

David Lawrence's avatar
David Lawrence committed
330 331 332 333 334 335 336 337 338 339 340 341
	/*
	 * Try splitting a frag that's at least twice as big as the size
	 * we want.
	 */
	doubled_size = new_size * 2;
	for (i = doubled_size;
	     i < ctx->max_size;
	     i += ALIGNMENT_SIZE) {
		if (ctx->freelists[i] != NULL) {
			split(ctx, i, new_size);
			return (ISC_TRUE);
		}
342 343
	}

344
	/*
David Lawrence's avatar
David Lawrence committed
345
	 * No luck.  Try splitting any frag bigger than the size we need.
346
	 */
David Lawrence's avatar
David Lawrence committed
347 348 349 350 351 352 353 354
	for (i = new_size + ALIGNMENT_SIZE;
	     i < doubled_size;
	     i += ALIGNMENT_SIZE) {
		if (ctx->freelists[i] != NULL) {
			split(ctx, i, new_size);
			return (ISC_TRUE);
		}
	}
355

David Lawrence's avatar
David Lawrence committed
356
	return (ISC_FALSE);
357 358
}

359
static inline isc_boolean_t
360
more_basic_blocks(isc_mem_t *ctx) {
361 362 363 364 365
	void *new;
	unsigned char *curr, *next;
	unsigned char *first, *last;
	unsigned char **table;
	unsigned int table_size;
Bob Halley's avatar
Bob Halley committed
366
	size_t increment;
367 368 369 370
	int i;

	/* Require: we hold the context lock. */

371 372 373
	/*
	 * Did we hit the quota for this context?
	 */
Bob Halley's avatar
Bob Halley committed
374 375
	increment = NUM_BASIC_BLOCKS * ctx->mem_target;
	if (ctx->quota != 0 && ctx->total + increment > ctx->quota)
376
		return (ISC_FALSE);
377 378 379

	INSIST(ctx->basic_table_count <= ctx->basic_table_size);
	if (ctx->basic_table_count == ctx->basic_table_size) {
380
		table_size = ctx->basic_table_size + TABLE_INCREMENT;
381 382
		table = (ctx->memalloc)(ctx->arg,
					table_size * sizeof (unsigned char *));
383
		if (table == NULL)
384
			return (ISC_FALSE);
385 386 387 388
		if (ctx->basic_table_size != 0) {
			memcpy(table, ctx->basic_table,
			       ctx->basic_table_size *
			       sizeof (unsigned char *));
389
			(ctx->memfree)(ctx->arg, ctx->basic_table);
390
		}
391 392
		ctx->basic_table = table;
		ctx->basic_table_size = table_size;
393
	}
394

395
	new = (ctx->memalloc)(ctx->arg, NUM_BASIC_BLOCKS * ctx->mem_target);
396
	if (new == NULL)
397
		return (ISC_FALSE);
Bob Halley's avatar
Bob Halley committed
398
	ctx->total += increment;
399 400
	ctx->basic_table[ctx->basic_table_count] = new;
	ctx->basic_table_count++;
401

402 403 404
	curr = new;
	next = curr + ctx->mem_target;
	for (i = 0; i < (NUM_BASIC_BLOCKS - 1); i++) {
405
		((element *)curr)->next = (element *)next;
406 407 408 409 410 411 412
		curr = next;
		next += ctx->mem_target;
	}
	/*
	 * curr is now pointing at the last block in the
	 * array.
	 */
Bob Halley's avatar
Bob Halley committed
413
	((element *)curr)->next = NULL;
414 415 416 417 418 419 420
	first = new;
	last = first + NUM_BASIC_BLOCKS * ctx->mem_target - 1;
	if (first < ctx->lowest || ctx->lowest == NULL)
		ctx->lowest = first;
	if (last > ctx->highest)
		ctx->highest = last;
	ctx->basic_blocks = new;
421 422

	return (ISC_TRUE);
423 424
}

425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442
static inline isc_boolean_t
more_frags(isc_mem_t *ctx, size_t new_size) {
	int i, frags;
	size_t total_size;
	void *new;
	unsigned char *curr, *next;

	/*
	 * Try to get more fragments by chopping up a basic block.
	 */

	if (ctx->basic_blocks == NULL) {
		if (!more_basic_blocks(ctx)) {
			/*
			 * We can't get more memory from the OS, or we've
			 * hit the quota for this context.
			 */
			/*
443
			 * XXXRTH  "At quota" notification here.
444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464
			 */
			/*
			 * Maybe we can split one of our existing
			 * list frags.
			 */
			return (try_split(ctx, new_size));
		}
	}

	total_size = ctx->mem_target;
	new = ctx->basic_blocks;
	ctx->basic_blocks = ctx->basic_blocks->next;
	frags = total_size / new_size;
	ctx->stats[new_size].blocks++;
	ctx->stats[new_size].freefrags += frags;
	/*
	 * Set up a linked-list of blocks of size
	 * "new_size".
	 */
	curr = new;
	next = curr + new_size;
465
	total_size -= new_size;
466 467 468 469
	for (i = 0; i < (frags - 1); i++) {
		((element *)curr)->next = (element *)next;
		curr = next;
		next += new_size;
470 471 472 473 474 475 476 477 478 479
		total_size -= new_size;
	}
	/*
	 * Add the remaining fragment of the basic block to a free list.
	 */
	total_size = rmsize(total_size);
	if (total_size > 0) {
		((element *)next)->next = ctx->freelists[total_size];
		ctx->freelists[total_size] = (element *)next;
		ctx->stats[total_size].freefrags++;
480 481 482 483 484 485 486 487 488 489 490
	}
	/*
	 * curr is now pointing at the last block in the
	 * array.
	 */
	((element *)curr)->next = NULL;
	ctx->freelists[new_size] = new;

	return (ISC_TRUE);
}

Michael Graff's avatar
Michael Graff committed
491
static inline void *
492
mem_getunlocked(isc_mem_t *ctx, size_t size) {
Michael Graff's avatar
Michael Graff committed
493 494
	size_t new_size = quantize(size);
	void *ret;
Bob Halley's avatar
base  
Bob Halley committed
495 496

	if (size >= ctx->max_size || new_size >= ctx->max_size) {
497 498 499
		/*
		 * memget() was called on something beyond our upper limit.
		 */
Bob Halley's avatar
Bob Halley committed
500 501 502 503
		if (ctx->quota != 0 && ctx->total + size > ctx->quota) {
			ret = NULL;
			goto done;
		}
Mark Andrews's avatar
Mark Andrews committed
504
		ret = (ctx->memalloc)(ctx->arg, size);
Bob Halley's avatar
base  
Bob Halley committed
505
		if (ret != NULL) {
Bob Halley's avatar
Bob Halley committed
506
			ctx->total += size;
507
			ctx->inuse += size;
Bob Halley's avatar
base  
Bob Halley committed
508 509
			ctx->stats[ctx->max_size].gets++;
			ctx->stats[ctx->max_size].totalgets++;
Mark Andrews's avatar
Mark Andrews committed
510 511 512 513 514 515
			/*
			 * If we don't set new_size to size, then the
			 * ISC_MEM_FILL code might write over bytes we
			 * don't own.
			 */
			new_size = size;
Bob Halley's avatar
base  
Bob Halley committed
516 517 518 519
		}
		goto done;
	}

520
	/*
Bob Halley's avatar
base  
Bob Halley committed
521 522 523 524
	 * If there are no blocks in the free list for this size, get a chunk
	 * of memory and then break it up into "new_size"-sized blocks, adding
	 * them to the free list.
	 */
525 526
	if (ctx->freelists[new_size] == NULL && !more_frags(ctx, new_size))
		return (NULL);
Bob Halley's avatar
base  
Bob Halley committed
527

528 529 530
	/*
	 * The free list uses the "rounded-up" size "new_size".
	 */
Bob Halley's avatar
base  
Bob Halley committed
531 532 533
	ret = ctx->freelists[new_size];
	ctx->freelists[new_size] = ctx->freelists[new_size]->next;

534
	/*
Bob Halley's avatar
base  
Bob Halley committed
535 536 537 538 539 540 541 542
	 * The stats[] uses the _actual_ "size" requested by the
	 * caller, with the caveat (in the code above) that "size" >= the
	 * max. size (max_size) ends up getting recorded as a call to
	 * max_size.
	 */
	ctx->stats[size].gets++;
	ctx->stats[size].totalgets++;
	ctx->stats[new_size].freefrags--;
543
	ctx->inuse += new_size;
Bob Halley's avatar
base  
Bob Halley committed
544 545 546

 done:

547
#if ISC_MEM_FILL
548 549
	if (ret != NULL)
		memset(ret, 0xbe, new_size); /* Mnemonic for "beef". */
David Lawrence's avatar
David Lawrence committed
550 551 552
#endif

	return (ret);
Michael Graff's avatar
Michael Graff committed
553 554 555
}

static inline void
556
mem_putunlocked(isc_mem_t *ctx, void *mem, size_t size) {
Michael Graff's avatar
Michael Graff committed
557
	size_t new_size = quantize(size);
Bob Halley's avatar
base  
Bob Halley committed
558

559
	if (size == ctx->max_size || new_size >= ctx->max_size) {
560 561 562
		/*
		 * memput() called on something beyond our upper limit.
		 */
563
#if ISC_MEM_FILL
Mark Andrews's avatar
Mark Andrews committed
564 565
		memset(mem, 0xde, size); /* Mnemonic for "dead". */
#endif
566
		(ctx->memfree)(ctx->arg, mem);
Bob Halley's avatar
base  
Bob Halley committed
567 568
		INSIST(ctx->stats[ctx->max_size].gets != 0);
		ctx->stats[ctx->max_size].gets--;
Bob Halley's avatar
Bob Halley committed
569
		INSIST(size <= ctx->total);
570
		ctx->inuse -= size;
Bob Halley's avatar
Bob Halley committed
571
		ctx->total -= size;
Michael Graff's avatar
Michael Graff committed
572
		return;
Bob Halley's avatar
base  
Bob Halley committed
573 574
	}

575 576
#if ISC_MEM_FILL
#if ISC_MEM_CHECKOVERRUN
577 578
	check_overrun(mem, size, new_size);
#endif
Mark Andrews's avatar
Mark Andrews committed
579 580
	memset(mem, 0xde, new_size); /* Mnemonic for "dead". */
#endif
581

582 583 584
	/*
	 * The free list uses the "rounded-up" size "new_size".
	 */
Mark Andrews's avatar
Mark Andrews committed
585 586
	((element *)mem)->next = ctx->freelists[new_size];
	ctx->freelists[new_size] = (element *)mem;
Bob Halley's avatar
base  
Bob Halley committed
587

588
	/*
Bob Halley's avatar
base  
Bob Halley committed
589 590 591 592 593 594 595 596
	 * The stats[] uses the _actual_ "size" requested by the
	 * caller, with the caveat (in the code above) that "size" >= the
	 * max. size (max_size) ends up getting recorded as a call to
	 * max_size.
	 */
	INSIST(ctx->stats[size].gets != 0);
	ctx->stats[size].gets--;
	ctx->stats[new_size].freefrags++;
597
	ctx->inuse -= new_size;
Bob Halley's avatar
base  
Bob Halley committed
598 599
}

David Lawrence's avatar
David Lawrence committed
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673
/*
 * Private.
 */

static void *
default_memalloc(void *arg, size_t size) {
	UNUSED(arg);
	return (malloc(size));
}

static void
default_memfree(void *arg, void *ptr) {
	UNUSED(arg);
	free(ptr);
}

/*
 * Public.
 */

isc_result_t
isc_mem_createx(size_t init_max_size, size_t target_size,
		isc_memalloc_t memalloc, isc_memfree_t memfree, void *arg,
		isc_mem_t **ctxp)
{
	isc_mem_t *ctx;

	REQUIRE(ctxp != NULL && *ctxp == NULL);
	REQUIRE(memalloc != NULL);
	REQUIRE(memfree != NULL);

	ctx = (memalloc)(arg, sizeof *ctx);
	if (ctx == NULL)
		return (ISC_R_NOMEMORY);

	if (init_max_size == 0)
		ctx->max_size = DEF_MAX_SIZE;
	else
		ctx->max_size = init_max_size;
	if (target_size == 0)
		ctx->mem_target = DEF_MEM_TARGET;
	else
		ctx->mem_target = target_size;
	ctx->memalloc = memalloc;
	ctx->memfree = memfree;
	ctx->arg = arg;
	ctx->freelists = (memalloc)(arg, ctx->max_size * sizeof (element *));
	if (ctx->freelists == NULL) {
		(memfree)(arg, ctx);
		return (ISC_R_NOMEMORY);
	}
	ctx->checkfree = ISC_TRUE;
	ctx->trysplit = ISC_FALSE;
	memset(ctx->freelists, 0,
	       ctx->max_size * sizeof (element *));
	ctx->stats = (memalloc)(arg,
				(ctx->max_size+1) * sizeof (struct stats));
	if (ctx->stats == NULL) {
		(memfree)(arg, ctx->freelists);
		(memfree)(arg, ctx);
		return (ISC_R_NOMEMORY);
	}
	memset(ctx->stats, 0, (ctx->max_size + 1) * sizeof (struct stats));
	ctx->basic_blocks = NULL;
	ctx->basic_table = NULL;
	ctx->basic_table_count = 0;
	ctx->basic_table_size = 0;
	ctx->lowest = NULL;
	ctx->highest = NULL;
	if (isc_mutex_init(&ctx->lock) != ISC_R_SUCCESS) {
		(memfree)(arg, ctx->stats);
		(memfree)(arg, ctx->freelists);
		(memfree)(arg, ctx);
		UNEXPECTED_ERROR(__FILE__, __LINE__,
674 675 676
				 "isc_mutex_init() %s",
				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
						ISC_MSG_FAILED, "failed"));
David Lawrence's avatar
David Lawrence committed
677 678 679 680 681 682
		return (ISC_R_UNEXPECTED);
	}
	ctx->references = 1;
	ctx->quota = 0;
	ctx->total = 0;
	ctx->inuse = 0;
683 684 685 686 687
	ctx->hi_water = 0;
	ctx->lo_water = 0;
	ctx->hi_called = ISC_FALSE;
	ctx->water = NULL;
	ctx->water_arg = NULL;
David Lawrence's avatar
David Lawrence committed
688 689 690
	ctx->magic = MEM_MAGIC;
	isc_ondestroy_init(&ctx->ondestroy);
	ISC_LIST_INIT(ctx->pools);
691
#if ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
692 693
	ISC_LIST_INIT(ctx->debuglist);
#endif
David Lawrence's avatar
David Lawrence committed
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715

	*ctxp = ctx;
	return (ISC_R_SUCCESS);
}

isc_result_t
isc_mem_create(size_t init_max_size, size_t target_size,
	       isc_mem_t **ctxp)
{
	return (isc_mem_createx(init_max_size, target_size,
				default_memalloc, default_memfree, NULL,
				ctxp));
}

static void
destroy(isc_mem_t *ctx) {
	unsigned int i;
	isc_ondestroy_t ondest;

	ctx->magic = 0;

	INSIST(ISC_LIST_EMPTY(ctx->pools));
716
#if ISC_MEM_TRACKLINES
717 718
	if (ctx->checkfree)
		INSIST(ISC_LIST_EMPTY(ctx->debuglist));
719 720 721 722 723 724 725 726 727 728
	else {
		debuglink_t *dl;

		for (dl = ISC_LIST_HEAD(ctx->debuglist);
		     dl != NULL;
		     dl = ISC_LIST_HEAD(ctx->debuglist)) {
			ISC_LIST_UNLINK(ctx->debuglist, dl, link);
			free(dl);
		}
	}
Michael Graff's avatar
Michael Graff committed
729
#endif
David Lawrence's avatar
David Lawrence committed
730 731 732 733 734 735 736 737 738 739 740 741
	INSIST(ctx->references == 0);

	if (ctx->checkfree) {
		for (i = 0; i <= ctx->max_size; i++)
			INSIST(ctx->stats[i].gets == 0);
	}

#if 0					/* XXX brister debugging */
	for (i = 0; i < ctx->basic_table_count; i++)
		memset(ctx->basic_table[i], 0x0,
		       NUM_BASIC_BLOCKS * ctx->mem_target);
#endif
742

David Lawrence's avatar
David Lawrence committed
743 744 745 746 747 748 749 750 751

	for (i = 0; i < ctx->basic_table_count; i++)
		(ctx->memfree)(ctx->arg, ctx->basic_table[i]);
	(ctx->memfree)(ctx->arg, ctx->freelists);
	(ctx->memfree)(ctx->arg, ctx->stats);
	(ctx->memfree)(ctx->arg, ctx->basic_table);

	ondest = ctx->ondestroy;

752
	DESTROYLOCK(&ctx->lock);
David Lawrence's avatar
David Lawrence committed
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791
	(ctx->memfree)(ctx->arg, ctx);

	isc_ondestroy_notify(&ondest, ctx);
}

void
isc_mem_attach(isc_mem_t *source, isc_mem_t **targetp) {
	REQUIRE(VALID_CONTEXT(source));
	REQUIRE(targetp != NULL && *targetp == NULL);

	LOCK(&source->lock);
	source->references++;
	UNLOCK(&source->lock);

	*targetp = source;
}

void
isc_mem_detach(isc_mem_t **ctxp) {
	isc_mem_t *ctx;
	isc_boolean_t want_destroy = ISC_FALSE;

	REQUIRE(ctxp != NULL);
	ctx = *ctxp;
	REQUIRE(VALID_CONTEXT(ctx));

	LOCK(&ctx->lock);
	INSIST(ctx->references > 0);
	ctx->references--;
	if (ctx->references == 0)
		want_destroy = ISC_TRUE;
	UNLOCK(&ctx->lock);

	if (want_destroy)
		destroy(ctx);

	*ctxp = NULL;
}

792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
/*
 * isc_mem_putanddetach() is the equivalent of:
 *
 * mctx = NULL;
 * isc_mem_attach(ptr->mctx, &mctx);
 * isc_mem_detach(&ptr->mctx);
 * isc_mem_put(mctx, ptr, sizeof(*ptr);
 * isc_mem_detach(&mctx);
 */

void
isc__mem_putanddetach(isc_mem_t **ctxp, void *ptr, size_t size FLARG) {
	isc_mem_t *ctx;
	isc_boolean_t want_destroy = ISC_FALSE;

	REQUIRE(ctxp != NULL);
	ctx = *ctxp;
	REQUIRE(VALID_CONTEXT(ctx));
	REQUIRE(ptr != NULL);

	/*
	 * Must be before mem_putunlocked() as ctxp is usually within
	 * [ptr..ptr+size).
	 */
	*ctxp = NULL;

	LOCK(&ctx->lock);
	DELETE_TRACE(ctx, ptr, size, file, line);
	mem_putunlocked(ctx, ptr, size);
	INSIST(ctx->references > 0);
	ctx->references--;
	if (ctx->references == 0)
		want_destroy = ISC_TRUE;
	UNLOCK(&ctx->lock);

	if (want_destroy)
		destroy(ctx);
}

David Lawrence's avatar
David Lawrence committed
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
void
isc_mem_destroy(isc_mem_t **ctxp) {
	isc_mem_t *ctx;
	isc_boolean_t want_destroy = ISC_FALSE;

	/*
	 * This routine provides legacy support for callers who use mctxs
	 * without attaching/detaching.
	 */

	REQUIRE(ctxp != NULL);
	ctx = *ctxp;
	REQUIRE(VALID_CONTEXT(ctx));

	LOCK(&ctx->lock);
	REQUIRE(ctx->references == 1);
	ctx->references--;
	if (ctx->references == 0)
		want_destroy = ISC_TRUE;
	UNLOCK(&ctx->lock);

	if (want_destroy)
		destroy(ctx);

	*ctxp = NULL;
}

isc_result_t
isc_mem_ondestroy(isc_mem_t *ctx, isc_task_t *task, isc_event_t **event) {
	isc_result_t res;
861

David Lawrence's avatar
David Lawrence committed
862 863 864 865 866 867 868 869 870 871 872 873
	LOCK(&ctx->lock);
	res = isc_ondestroy_register(&ctx->ondestroy, task, event);
	UNLOCK(&ctx->lock);

	return (res);
}


isc_result_t
isc_mem_restore(isc_mem_t *ctx) {
	isc_result_t result;

874
	result = isc_mutex_init(&ctx->lock);
David Lawrence's avatar
David Lawrence committed
875 876 877 878 879 880
	if (result != ISC_R_SUCCESS)
		ctx->magic = 0;

	return (result);
}

881
#if ISC_MEM_FILL && ISC_MEM_CHECKOVERRUN
David Lawrence's avatar
David Lawrence committed
882 883 884 885 886 887 888 889 890 891 892 893 894 895
static inline void
check_overrun(void *mem, size_t size, size_t new_size) {
	unsigned char *cp;

	cp = (unsigned char *)mem;
	cp += size;
	while (size < new_size) {
		INSIST(*cp == 0xbe);
		cp++;
		size++;
	}
}
#endif

Michael Graff's avatar
Michael Graff committed
896 897 898
void *
isc__mem_get(isc_mem_t *ctx, size_t size FLARG) {
	void *ptr;
899
	isc_boolean_t call_water = ISC_FALSE;
Michael Graff's avatar
Michael Graff committed
900

David Lawrence's avatar
David Lawrence committed
901 902 903
	REQUIRE(VALID_CONTEXT(ctx));

	LOCK(&ctx->lock);
Michael Graff's avatar
Michael Graff committed
904 905
	ptr = mem_getunlocked(ctx, size);
	ADD_TRACE(ctx, ptr, size, file, line);
906 907 908 909 910
	if (ctx->hi_water != 0 && !ctx->hi_called &&
	    ctx->inuse > ctx->hi_water) {
		ctx->hi_called = ISC_TRUE;
		call_water = ISC_TRUE;
	}
David Lawrence's avatar
David Lawrence committed
911
	UNLOCK(&ctx->lock);
912 913 914 915 916 917 918

	/* XXX remove */
	if (ctx->hi_water)
		fprintf(stderr,"inuse %u, total %u\n", ctx->inuse, ctx->total);

	if (call_water) {
		/* XXX remove */
919 920 921 922
		fprintf(stderr, "%s water(%p, ISC_MEM_HIWATER)\n",
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
				       ISC_MSG_CALLING, "calling"),
			ctx->water_arg);
923 924 925
		(ctx->water)(ctx->water_arg, ISC_MEM_HIWATER);
	}

Bob Halley's avatar
base  
Bob Halley committed
926 927 928 929
	return (ptr);
}

void
Michael Graff's avatar
Michael Graff committed
930
isc__mem_put(isc_mem_t *ctx, void *ptr, size_t size FLARG)
Bob Halley's avatar
base  
Bob Halley committed
931
{
932 933
	isc_boolean_t call_water = ISC_FALSE;

Michael Graff's avatar
Michael Graff committed
934 935 936 937 938 939
	REQUIRE(VALID_CONTEXT(ctx));
	REQUIRE(ptr != NULL);

	LOCK(&ctx->lock);
	DELETE_TRACE(ctx, ptr, size, file, line);
	mem_putunlocked(ctx, ptr, size);
940 941 942 943
	if (ctx->hi_called && ctx->inuse < ctx->lo_water) {
		ctx->hi_called = ISC_FALSE;
		call_water = ISC_TRUE;
	}
Michael Graff's avatar
Michael Graff committed
944
	UNLOCK(&ctx->lock);
945 946 947 948 949 950 951

	/* XXX remove */
	if (ctx->hi_water)
		fprintf(stderr,"inuse %u, total %u\n", ctx->inuse, ctx->total);

	if (call_water) {
		/* XXX remove */
952 953 954 955
		fprintf(stderr, "%s water(%p,ISC_MEM_LOWATER)\n",
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
				       ISC_MSG_CALLING, "calling"),
			ctx->water_arg);
956 957
		(ctx->water)(ctx->water_arg, ISC_MEM_LOWATER);
	}
Bob Halley's avatar
base  
Bob Halley committed
958 959
}

960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
isc_result_t
isc_mem_preallocate(isc_mem_t *ctx) {
	size_t i;
	isc_result_t result = ISC_R_SUCCESS;
	void *ptr;

	REQUIRE(VALID_CONTEXT(ctx));

	LOCK(&ctx->lock);

	for (i = 0; i < ctx->max_size; i += ALIGNMENT_SIZE) {
		ptr = mem_getunlocked(ctx, i);
		if (ptr == NULL) {
			result = ISC_R_NOMEMORY;
			break;
		}
		mem_putunlocked(ctx, ptr, i);
	}
978

979 980 981 982 983
	UNLOCK(&ctx->lock);

	return (result);
}

Bob Halley's avatar
base  
Bob Halley committed
984 985 986 987
/*
 * Print the stats[] on the stream "out" with suitable formatting.
 */
void
988
isc_mem_stats(isc_mem_t *ctx, FILE *out) {
Bob Halley's avatar
base  
Bob Halley committed
989
	size_t i;
Michael Graff's avatar
Michael Graff committed
990 991
	const struct stats *s;
	const isc_mempool_t *pool;
Bob Halley's avatar
base  
Bob Halley committed
992

Bob Halley's avatar
Bob Halley committed
993 994
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
995

Michael Graff's avatar
Michael Graff committed
996
	if (ctx->freelists != NULL) {
997
		for (i = 0; i <= ctx->max_size; i++) {
Michael Graff's avatar
Michael Graff committed
998 999 1000 1001
			s = &ctx->stats[i];

			if (s->totalgets == 0 && s->gets == 0)
				continue;
1002
			fprintf(out, "%s%5lu: %11lu gets, %11lu rem",
Michael Graff's avatar
Michael Graff committed
1003
				(i == ctx->max_size) ? ">=" : "  ",
1004
				(unsigned long) i, s->totalgets, s->gets);
1005
			if (s->blocks != 0 || s->freefrags != 0)
Michael Graff's avatar
Michael Graff committed
1006 1007 1008 1009 1010 1011
				fprintf(out, " (%lu bl, %lu ff)",
					s->blocks, s->freefrags);
			fputc('\n', out);
		}
	}

Michael Graff's avatar
Michael Graff committed
1012 1013 1014 1015 1016 1017 1018
	/*
	 * Note that since a pool can be locked now, these stats might be
	 * somewhat off if the pool is in active use at the time the stats
	 * are dumped.  The link fields are protected by the isc_mem_t's
	 * lock, however, so walking this list and extracting integers from
	 * stats fields is always safe.
	 */
Michael Graff's avatar
Michael Graff committed
1019 1020
	pool = ISC_LIST_HEAD(ctx->pools);
	if (pool != NULL) {
1021 1022 1023
		fprintf(out, isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
					    ISC_MSG_POOLSTATS,
					    "[Pool statistics]\n"));
Michael Graff's avatar
Michael Graff committed
1024
		fprintf(out, "%15s %10s %10s %10s %10s %10s %10s %10s %1s\n",
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLNAME, "name"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLSIZE, "size"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLMAXALLOC, "maxalloc"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLALLOCATED, "allocated"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLFREECOUNT, "freecount"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLFREEMAX, "freemax"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLFILLCOUNT, "fillcount"),
			isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
				       ISC_MSG_POOLGETS, "gets"),
			"L");
Michael Graff's avatar
Michael Graff committed
1042 1043
	}
	while (pool != NULL) {
1044 1045
		fprintf(out, "%15s %10lu %10u %10u %10u %10u %10u %10u %s\n",
			pool->name, (unsigned long) pool->size, pool->maxalloc,
Michael Graff's avatar
Michael Graff committed
1046 1047
			pool->allocated, pool->freecount, pool->freemax,
			pool->fillcount, pool->gets,
Michael Graff's avatar
Michael Graff committed
1048
			(pool->lock == NULL ? "N" : "Y"));
Michael Graff's avatar
Michael Graff committed
1049
		pool = ISC_LIST_NEXT(pool, link);
Bob Halley's avatar
base  
Bob Halley committed
1050 1051
	}

1052
#if ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
1053 1054 1055 1056
	if (isc_mem_debugging > 1) {
		debuglink_t *dl;
		unsigned int i;

1057 1058 1059
		fprintf(out, isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
					    ISC_MSG_DUMPALLOC,
					    "DUMP OF ALL OUTSTANDING "
1060
					    "MEMORY ALLOCATIONS\n"));
Michael Graff's avatar
Michael Graff committed
1061 1062
		dl = ISC_LIST_HEAD(ctx->debuglist);
		if (dl == NULL)
1063 1064 1065
			fprintf(out, isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
						    ISC_MSG_NONE,
						    "\tNone.\n"));
Michael Graff's avatar
Michael Graff committed
1066 1067 1068 1069
		while (dl != NULL) {
			for (i = 0 ; i < DEBUGLIST_COUNT ; i++)
				if (dl->ptr[i] != NULL)
					fprintf(out,
1070 1071 1072 1073 1074 1075
						isc_msgcat_get(isc_msgcat,
							   ISC_MSGSET_MEM,
							   ISC_MSG_PTRFILELINE,
							   "\tptr %p "
							   "file %s "
							   "line %u\n"),
Michael Graff's avatar
Michael Graff committed
1076 1077 1078 1079 1080 1081 1082
						dl->ptr[i], dl->file[i],
						dl->line[i]);
			dl = ISC_LIST_NEXT(dl, link);
		}
	}
#endif

Bob Halley's avatar
Bob Halley committed
1083
	UNLOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1084 1085
}

Bob Halley's avatar
Bob Halley committed
1086
isc_boolean_t
1087
isc_mem_valid(isc_mem_t *ctx, void *ptr) {
Bob Halley's avatar
Bob Halley committed
1088
	unsigned char *cp = ptr;
Bob Halley's avatar
Bob Halley committed
1089
	isc_boolean_t result = ISC_FALSE;
Bob Halley's avatar
base  
Bob Halley committed
1090

Bob Halley's avatar
Bob Halley committed
1091 1092
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1093 1094

	if (ctx->lowest != NULL && cp >= ctx->lowest && cp <= ctx->highest)
Bob Halley's avatar
Bob Halley committed
1095
		result = ISC_TRUE;
Bob Halley's avatar
base  
Bob Halley committed
1096

Bob Halley's avatar
Bob Halley committed
1097
	UNLOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1098

Bob Halley's avatar
Bob Halley committed
1099
	return (result);
Bob Halley's avatar
base  
Bob Halley committed
1100 1101 1102
}

/*
1103 1104
 * Replacements for malloc() and free() -- they implicitly remember the
 * size of the object allocated (with some additional overhead).
Bob Halley's avatar
base  
Bob Halley committed
1105 1106
 */

Michael Graff's avatar
Michael Graff committed
1107 1108
static void *
isc__mem_allocateunlocked(isc_mem_t *ctx, size_t size) {
Bob Halley's avatar
Bob Halley committed
1109
	size_info *si;
Bob Halley's avatar
base  
Bob Halley committed
1110 1111

	size += ALIGNMENT_SIZE;
Michael Graff's avatar
Michael Graff committed
1112
	si = mem_getunlocked(ctx, size);
Bob Halley's avatar
base  
Bob Halley committed
1113 1114
	if (si == NULL)
		return (NULL);
1115
	si->u.size = size;
Bob Halley's avatar
base  
Bob Halley committed
1116 1117 1118
	return (&si[1]);
}

1119
void *
Michael Graff's avatar
Michael Graff committed
1120
isc__mem_allocate(isc_mem_t *ctx, size_t size FLARG) {
1121 1122
	size_info *si;

Michael Graff's avatar
Michael Graff committed
1123
	REQUIRE(VALID_CONTEXT(ctx));
1124

Michael Graff's avatar
Michael Graff committed
1125 1126
	LOCK(&ctx->lock);
	si = isc__mem_allocateunlocked(ctx, size);
1127
#if ISC_MEM_TRACKLINES
Michael Graff's avatar
Michael Graff committed
1128 1129 1130 1131
	if (si != NULL)
		ADD_TRACE(ctx, si, si[-1].u.size, file, line);
#endif
	UNLOCK(&ctx->lock);
1132

Michael Graff's avatar
Michael Graff committed
1133
	return (si);
1134 1135
}

Bob Halley's avatar
base  
Bob Halley committed
1136
void
Michael Graff's avatar
Michael Graff committed
1137
isc__mem_free(isc_mem_t *ctx, void *ptr FLARG) {
Bob Halley's avatar
Bob Halley committed
1138
	size_info *si;
Bob Halley's avatar
base  
Bob Halley committed
1139

Michael Graff's avatar
Michael Graff committed
1140 1141 1142
	REQUIRE(VALID_CONTEXT(ctx));
	REQUIRE(ptr != NULL);