mem.c 34 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 1.66 2000/11/25 06:40:54 marka 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/ondestroy.h>
30
#include <isc/string.h>
Bob Halley's avatar
Bob Halley committed
31

32
#ifndef ISC_SINGLETHREADED
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
Bob Halley committed
35
#else
Bob Halley's avatar
Bob Halley committed
36 37
#define LOCK(l)
#define UNLOCK(l)
Bob Halley's avatar
update  
Bob Halley committed
38 39
#endif

Michael Graff's avatar
Michael Graff committed
40
unsigned int isc_mem_debugging = 0;
41 42 43 44 45 46 47 48 49 50

/*
 * 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
51
#define DEBUGLIST_COUNT		1024
52

Bob Halley's avatar
base  
Bob Halley committed
53 54 55
/*
 * Types.
 */
Michael Graff's avatar
Michael Graff committed
56 57 58 59 60 61 62 63 64
#ifdef ISC_MEM_TRACKLINES
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
65

Michael Graff's avatar
Michael Graff committed
66 67 68 69 70 71
#define FLARG_PASS	, file, line
#define FLARG		, const char *file, int line
#else
#define FLARG_PASS
#define FLARG
#endif
72

Michael Graff's avatar
Michael Graff committed
73
typedef struct element element;
74 75 76
struct element {
	element *		next;
};
Bob Halley's avatar
base  
Bob Halley committed
77 78 79 80 81

typedef struct {
	/*
	 * This structure must be ALIGNMENT_SIZE bytes.
	 */
82 83 84 85
	union {
		size_t		size;
		char		bytes[ALIGNMENT_SIZE];
	} u;
Bob Halley's avatar
Bob Halley committed
86
} size_info;
Bob Halley's avatar
base  
Bob Halley committed
87 88

struct stats {
Bob Halley's avatar
Bob Halley committed
89 90 91 92
	unsigned long		gets;
	unsigned long		totalgets;
	unsigned long		blocks;
	unsigned long		freefrags;
Bob Halley's avatar
base  
Bob Halley committed
93 94
};

95 96
#define MEM_MAGIC		0x4D656d43U	/* MemC. */
#define VALID_CONTEXT(c)	((c) != NULL && (c)->magic == MEM_MAGIC)
Bob Halley's avatar
Bob Halley committed
97

98
struct isc_mem {
Bob Halley's avatar
Bob Halley committed
99
	unsigned int		magic;
100
	isc_ondestroy_t		ondestroy;
Bob Halley's avatar
Bob Halley committed
101
	isc_mutex_t		lock;
102 103 104
	isc_memalloc_t		memalloc;
	isc_memfree_t		memfree;
	void *			arg;
Bob Halley's avatar
base  
Bob Halley committed
105 106
	size_t			max_size;
	size_t			mem_target;
Bob Halley's avatar
Bob Halley committed
107 108
	element **		freelists;
	element *		basic_blocks;
109 110 111
	unsigned char **	basic_table;
	unsigned int		basic_table_count;
	unsigned int		basic_table_size;
Bob Halley's avatar
Bob Halley committed
112 113
	unsigned char *		lowest;
	unsigned char *		highest;
114
	isc_boolean_t		checkfree;
115
	isc_boolean_t		trysplit;
Bob Halley's avatar
base  
Bob Halley committed
116
	struct stats *		stats;
117
	unsigned int		references;
118
	size_t			quota;
Bob Halley's avatar
Bob Halley committed
119
	size_t			total;
120
	size_t			inuse;
121 122 123 124 125
	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
126
	ISC_LIST(isc_mempool_t)	pools;
Michael Graff's avatar
Michael Graff committed
127 128 129
#ifdef ISC_MEM_TRACKLINES
	ISC_LIST(debuglink_t)	debuglist;
#endif
Michael Graff's avatar
Michael Graff committed
130 131 132 133 134 135
};

#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
136
	/* always unlocked */
Michael Graff's avatar
Michael Graff committed
137
	unsigned int	magic;		/* magic number */
Michael Graff's avatar
Michael Graff committed
138
	isc_mutex_t    *lock;		/* optional lock */
Michael Graff's avatar
Michael Graff committed
139
	isc_mem_t      *mctx;		/* our memory context */
Michael Graff's avatar
Michael Graff committed
140 141 142
	/* 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
143 144 145 146 147 148 149 150 151
	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
152
	/* Debugging only. */
Michael Graff's avatar
Michael Graff committed
153
#ifdef ISC_MEMPOOL_NAMES
Michael Graff's avatar
Michael Graff committed
154 155
	char		name[16];	/* printed name in stats reports */
#endif
Bob Halley's avatar
base  
Bob Halley committed
156 157
};

158 159 160
/*
 * Private Inline-able.
 */
Bob Halley's avatar
base  
Bob Halley committed
161

Michael Graff's avatar
Michael Graff committed
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176
#ifndef ISC_MEM_TRACKLINES
#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
177
		FLARG)
Michael Graff's avatar
Michael Graff committed
178 179 180 181 182
{
	debuglink_t *dl;
	unsigned int i;

	if (MEM_TRACE)
183 184
		fprintf(stderr, "add %p size %u file %s line %u mctx %p\n",
			ptr, size, file, line, mctx);
Michael Graff's avatar
Michael Graff committed
185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231

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

	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 */

267 268 269 270 271 272 273 274 275
static inline size_t
rmsize(size_t size) {
	/*
 	 * round down to ALIGNMENT_SIZE
	 */
	size -= (size % ALIGNMENT_SIZE);
	return (size);
}

276
static inline size_t
Bob Halley's avatar
base  
Bob Halley committed
277
quantize(size_t size) {
278
	int temp;
Bob Halley's avatar
base  
Bob Halley committed
279 280

	/*
281
	 * Round up the result in order to get a size big
Bob Halley's avatar
base  
Bob Halley committed
282 283 284
	 * enough to satisfy the request and be aligned on ALIGNMENT_SIZE
	 * byte boundaries.
	 */
285

286 287
	if (size == 0)
		return (ALIGNMENT_SIZE);
Mark Andrews's avatar
Mark Andrews committed
288
	temp = size + (ALIGNMENT_SIZE - 1);
289
	return (temp - temp % ALIGNMENT_SIZE);
Bob Halley's avatar
base  
Bob Halley committed
290 291
}

David Lawrence's avatar
David Lawrence committed
292 293 294 295
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
296

David Lawrence's avatar
David Lawrence committed
297 298 299 300 301 302
	/*
	 * 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
303

David Lawrence's avatar
David Lawrence committed
304 305 306 307 308 309
	/*
	 * 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
310

David Lawrence's avatar
David Lawrence committed
311 312 313 314 315 316 317 318
	/*
	 * 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++;
319 320
}

David Lawrence's avatar
David Lawrence committed
321 322 323
static inline isc_boolean_t
try_split(isc_mem_t *ctx, size_t new_size) {
	size_t i, doubled_size;
324

David Lawrence's avatar
David Lawrence committed
325 326
	if (!ctx->trysplit)
		return (ISC_FALSE);
Michael Graff's avatar
Michael Graff committed
327

David Lawrence's avatar
David Lawrence committed
328 329 330 331 332 333 334 335 336 337 338 339
	/*
	 * 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);
		}
340 341
	}

342
	/*
David Lawrence's avatar
David Lawrence committed
343
	 * No luck.  Try splitting any frag bigger than the size we need.
344
	 */
David Lawrence's avatar
David Lawrence committed
345 346 347 348 349 350 351 352
	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);
		}
	}
353

David Lawrence's avatar
David Lawrence committed
354
	return (ISC_FALSE);
355 356
}

357
static inline isc_boolean_t
358
more_basic_blocks(isc_mem_t *ctx) {
359 360 361 362 363
	void *new;
	unsigned char *curr, *next;
	unsigned char *first, *last;
	unsigned char **table;
	unsigned int table_size;
Bob Halley's avatar
Bob Halley committed
364
	size_t increment;
365 366 367 368
	int i;

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

369 370 371
	/*
	 * Did we hit the quota for this context?
	 */
Bob Halley's avatar
Bob Halley committed
372 373
	increment = NUM_BASIC_BLOCKS * ctx->mem_target;
	if (ctx->quota != 0 && ctx->total + increment > ctx->quota)
374
		return (ISC_FALSE);
375 376 377

	INSIST(ctx->basic_table_count <= ctx->basic_table_size);
	if (ctx->basic_table_count == ctx->basic_table_size) {
378
		table_size = ctx->basic_table_size + TABLE_INCREMENT;
379 380
		table = (ctx->memalloc)(ctx->arg,
					table_size * sizeof (unsigned char *));
381
		if (table == NULL)
382
			return (ISC_FALSE);
383 384 385 386
		if (ctx->basic_table_size != 0) {
			memcpy(table, ctx->basic_table,
			       ctx->basic_table_size *
			       sizeof (unsigned char *));
387
			(ctx->memfree)(ctx->arg, ctx->basic_table);
388
		}
389 390
		ctx->basic_table = table;
		ctx->basic_table_size = table_size;
391
	}
392

393
	new = (ctx->memalloc)(ctx->arg, NUM_BASIC_BLOCKS * ctx->mem_target);
394
	if (new == NULL)
395
		return (ISC_FALSE);
Bob Halley's avatar
Bob Halley committed
396
	ctx->total += increment;
397 398
	ctx->basic_table[ctx->basic_table_count] = new;
	ctx->basic_table_count++;
399

400 401 402
	curr = new;
	next = curr + ctx->mem_target;
	for (i = 0; i < (NUM_BASIC_BLOCKS - 1); i++) {
403
		((element *)curr)->next = (element *)next;
404 405 406 407 408 409 410
		curr = next;
		next += ctx->mem_target;
	}
	/*
	 * curr is now pointing at the last block in the
	 * array.
	 */
Bob Halley's avatar
Bob Halley committed
411
	((element *)curr)->next = NULL;
412 413 414 415 416 417 418
	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;
419 420

	return (ISC_TRUE);
421 422
}

423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440
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.
			 */
			/*
441
			 * XXXRTH  "At quota" notification here.
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462
			 */
			/*
			 * 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;
463
	total_size -= new_size;
464 465 466 467
	for (i = 0; i < (frags - 1); i++) {
		((element *)curr)->next = (element *)next;
		curr = next;
		next += new_size;
468 469 470 471 472 473 474 475 476 477
		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++;
478 479 480 481 482 483 484 485 486 487 488
	}
	/*
	 * 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
489
static inline void *
490
mem_getunlocked(isc_mem_t *ctx, size_t size) {
Michael Graff's avatar
Michael Graff committed
491 492
	size_t new_size = quantize(size);
	void *ret;
Bob Halley's avatar
base  
Bob Halley committed
493 494

	if (size >= ctx->max_size || new_size >= ctx->max_size) {
495 496 497
		/*
		 * memget() was called on something beyond our upper limit.
		 */
Bob Halley's avatar
Bob Halley committed
498 499 500 501
		if (ctx->quota != 0 && ctx->total + size > ctx->quota) {
			ret = NULL;
			goto done;
		}
Mark Andrews's avatar
Mark Andrews committed
502
		ret = (ctx->memalloc)(ctx->arg, size);
Bob Halley's avatar
base  
Bob Halley committed
503
		if (ret != NULL) {
Bob Halley's avatar
Bob Halley committed
504
			ctx->total += size;
505
			ctx->inuse += size;
Bob Halley's avatar
base  
Bob Halley committed
506 507
			ctx->stats[ctx->max_size].gets++;
			ctx->stats[ctx->max_size].totalgets++;
Mark Andrews's avatar
Mark Andrews committed
508 509 510 511 512 513
			/*
			 * 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
514 515 516 517
		}
		goto done;
	}

518
	/*
Bob Halley's avatar
base  
Bob Halley committed
519 520 521 522
	 * 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.
	 */
523 524
	if (ctx->freelists[new_size] == NULL && !more_frags(ctx, new_size))
		return (NULL);
Bob Halley's avatar
base  
Bob Halley committed
525

526 527 528
	/*
	 * The free list uses the "rounded-up" size "new_size".
	 */
Bob Halley's avatar
base  
Bob Halley committed
529 530 531
	ret = ctx->freelists[new_size];
	ctx->freelists[new_size] = ctx->freelists[new_size]->next;

532
	/*
Bob Halley's avatar
base  
Bob Halley committed
533 534 535 536 537 538 539 540
	 * 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--;
541
	ctx->inuse += new_size;
Bob Halley's avatar
base  
Bob Halley committed
542 543 544

 done:

Michael Graff's avatar
Michael Graff committed
545
#ifdef ISC_MEM_FILL
546 547
	if (ret != NULL)
		memset(ret, 0xbe, new_size); /* Mnemonic for "beef". */
David Lawrence's avatar
David Lawrence committed
548 549 550
#endif

	return (ret);
Michael Graff's avatar
Michael Graff committed
551 552 553
}

static inline void
554
mem_putunlocked(isc_mem_t *ctx, void *mem, size_t size) {
Michael Graff's avatar
Michael Graff committed
555
	size_t new_size = quantize(size);
Bob Halley's avatar
base  
Bob Halley committed
556

557
	if (size == ctx->max_size || new_size >= ctx->max_size) {
558 559 560
		/*
		 * memput() called on something beyond our upper limit.
		 */
Michael Graff's avatar
Michael Graff committed
561
#ifdef ISC_MEM_FILL
Mark Andrews's avatar
Mark Andrews committed
562 563
		memset(mem, 0xde, size); /* Mnemonic for "dead". */
#endif
564
		(ctx->memfree)(ctx->arg, mem);
Bob Halley's avatar
base  
Bob Halley committed
565 566
		INSIST(ctx->stats[ctx->max_size].gets != 0);
		ctx->stats[ctx->max_size].gets--;
Bob Halley's avatar
Bob Halley committed
567
		INSIST(size <= ctx->total);
568
		ctx->inuse -= size;
Bob Halley's avatar
Bob Halley committed
569
		ctx->total -= size;
Michael Graff's avatar
Michael Graff committed
570
		return;
Bob Halley's avatar
base  
Bob Halley committed
571 572
	}

Michael Graff's avatar
Michael Graff committed
573 574
#ifdef ISC_MEM_FILL
#ifdef ISC_MEM_CHECKOVERRUN
575 576
	check_overrun(mem, size, new_size);
#endif
Mark Andrews's avatar
Mark Andrews committed
577 578
	memset(mem, 0xde, new_size); /* Mnemonic for "dead". */
#endif
579

580 581 582
	/*
	 * The free list uses the "rounded-up" size "new_size".
	 */
Mark Andrews's avatar
Mark Andrews committed
583 584
	((element *)mem)->next = ctx->freelists[new_size];
	ctx->freelists[new_size] = (element *)mem;
Bob Halley's avatar
base  
Bob Halley committed
585

586
	/*
Bob Halley's avatar
base  
Bob Halley committed
587 588 589 590 591 592 593 594
	 * 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++;
595
	ctx->inuse -= new_size;
Bob Halley's avatar
base  
Bob Halley committed
596 597
}

David Lawrence's avatar
David Lawrence committed
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
/*
 * 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__,
				 "isc_mutex_init() failed");
		return (ISC_R_UNEXPECTED);
	}
	ctx->references = 1;
	ctx->quota = 0;
	ctx->total = 0;
	ctx->inuse = 0;
679 680 681 682 683
	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
684 685 686
	ctx->magic = MEM_MAGIC;
	isc_ondestroy_init(&ctx->ondestroy);
	ISC_LIST_INIT(ctx->pools);
Michael Graff's avatar
Michael Graff committed
687 688 689
#ifdef ISC_MEM_TRACKLINES
	ISC_LIST_INIT(ctx->debuglist);
#endif
David Lawrence's avatar
David Lawrence committed
690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711

	*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));
Michael Graff's avatar
Michael Graff committed
712
#ifdef ISC_MEM_TRACKLINES
713 714
	if (ctx->checkfree)
		INSIST(ISC_LIST_EMPTY(ctx->debuglist));
715 716 717 718 719 720 721 722 723 724
	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
725
#endif
David Lawrence's avatar
David Lawrence committed
726 727 728 729 730 731 732 733 734 735 736 737
	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
738

David Lawrence's avatar
David Lawrence committed
739 740 741 742 743 744 745 746 747

	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;

748
	DESTROYLOCK(&ctx->lock);
David Lawrence's avatar
David Lawrence committed
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
	(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;
}

788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
/*
 * 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
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
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;
857

David Lawrence's avatar
David Lawrence committed
858 859 860 861 862 863 864 865 866 867 868 869
	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;

870
	result = isc_mutex_init(&ctx->lock);
David Lawrence's avatar
David Lawrence committed
871 872 873 874 875 876
	if (result != ISC_R_SUCCESS)
		ctx->magic = 0;

	return (result);
}

Michael Graff's avatar
Michael Graff committed
877
#if defined(ISC_MEM_FILL) && defined(ISC_MEM_CHECKOVERRUN)
David Lawrence's avatar
David Lawrence committed
878 879 880 881 882 883 884 885 886 887 888 889 890 891
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
892 893 894
void *
isc__mem_get(isc_mem_t *ctx, size_t size FLARG) {
	void *ptr;
895
	isc_boolean_t call_water = ISC_FALSE;
Michael Graff's avatar
Michael Graff committed
896

David Lawrence's avatar
David Lawrence committed
897 898 899
	REQUIRE(VALID_CONTEXT(ctx));

	LOCK(&ctx->lock);
Michael Graff's avatar
Michael Graff committed
900 901
	ptr = mem_getunlocked(ctx, size);
	ADD_TRACE(ctx, ptr, size, file, line);
902 903 904 905 906
	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
907
	UNLOCK(&ctx->lock);
908 909 910 911 912 913 914 915 916 917 918 919

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

	if (call_water) {
		/* XXX remove */
		fprintf(stderr, "calling water(%p,ISC_MEM_HIWATER)\n",
			 ctx->water_arg);
		(ctx->water)(ctx->water_arg, ISC_MEM_HIWATER);
	}

Bob Halley's avatar
base  
Bob Halley committed
920 921 922 923
	return (ptr);
}

void
Michael Graff's avatar
Michael Graff committed
924
isc__mem_put(isc_mem_t *ctx, void *ptr, size_t size FLARG)
Bob Halley's avatar
base  
Bob Halley committed
925
{
926 927
	isc_boolean_t call_water = ISC_FALSE;

Michael Graff's avatar
Michael Graff committed
928 929 930 931 932 933
	REQUIRE(VALID_CONTEXT(ctx));
	REQUIRE(ptr != NULL);

	LOCK(&ctx->lock);
	DELETE_TRACE(ctx, ptr, size, file, line);
	mem_putunlocked(ctx, ptr, size);
934 935 936 937
	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
938
	UNLOCK(&ctx->lock);
939 940 941 942 943 944 945 946 947 948 949

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

	if (call_water) {
		/* XXX remove */
		fprintf(stderr, "calling water(%p,ISC_MEM_LOWATER)\n",
			 ctx->water_arg);
		(ctx->water)(ctx->water_arg, ISC_MEM_LOWATER);
	}
Bob Halley's avatar
base  
Bob Halley committed
950 951
}

952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
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);
	}
970

971 972 973 974 975
	UNLOCK(&ctx->lock);

	return (result);
}

Bob Halley's avatar
base  
Bob Halley committed
976 977 978 979
/*
 * Print the stats[] on the stream "out" with suitable formatting.
 */
void
980
isc_mem_stats(isc_mem_t *ctx, FILE *out) {
Bob Halley's avatar
base  
Bob Halley committed
981
	size_t i;
Michael Graff's avatar
Michael Graff committed
982 983
	const struct stats *s;
	const isc_mempool_t *pool;
Bob Halley's avatar
base  
Bob Halley committed
984

Bob Halley's avatar
Bob Halley committed
985 986
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
987

Michael Graff's avatar
Michael Graff committed
988
	if (ctx->freelists != NULL) {
989
		for (i = 0; i <= ctx->max_size; i++) {
Michael Graff's avatar
Michael Graff committed
990 991 992 993
			s = &ctx->stats[i];

			if (s->totalgets == 0 && s->gets == 0)
				continue;
994
			fprintf(out, "%s%5lu: %11lu gets, %11lu rem",
Michael Graff's avatar
Michael Graff committed
995
				(i == ctx->max_size) ? ">=" : "  ",
996
				(unsigned long) i, s->totalgets, s->gets);
997
			if (s->blocks != 0 || s->freefrags != 0)
Michael Graff's avatar
Michael Graff committed
998 999 1000 1001 1002 1003
				fprintf(out, " (%lu bl, %lu ff)",
					s->blocks, s->freefrags);
			fputc('\n', out);
		}
	}

Michael Graff's avatar
Michael Graff committed
1004 1005 1006 1007 1008 1009 1010
	/*
	 * 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
1011 1012 1013
	pool = ISC_LIST_HEAD(ctx->pools);
	if (pool != NULL) {
		fprintf(out, "[Pool statistics]\n");
Michael Graff's avatar
Michael Graff committed
1014 1015
		fprintf(out, "%15s %10s %10s %10s %10s %10s %10s %10s %1s\n",
			"name", "size", "maxalloc", "allocated", "freecount",
Michael Graff's avatar
Michael Graff committed
1016
			"freemax", "fillcount", "gets", "L");
Michael Graff's avatar
Michael Graff committed
1017 1018
	}
	while (pool != NULL) {
1019 1020
		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
1021 1022
			pool->allocated, pool->freecount, pool->freemax,
			pool->fillcount, pool->gets,
Michael Graff's avatar
Michael Graff committed
1023
			(pool->lock == NULL ? "N" : "Y"));
Michael Graff's avatar
Michael Graff committed
1024
		pool = ISC_LIST_NEXT(pool, link);
Bob Halley's avatar
base  
Bob Halley committed
1025 1026
	}

Michael Graff's avatar
Michael Graff committed
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
#ifdef ISC_MEM_TRACKLINES
	if (isc_mem_debugging > 1) {
		debuglink_t *dl;
		unsigned int i;

		fprintf(out, "DUMP OF ALL OUTSTANDING MEMORY ALLOCATIONS\n");
		dl = ISC_LIST_HEAD(ctx->debuglist);
		if (dl == NULL)
			fprintf(out, "\tNone.\n");
		while (dl != NULL) {
			for (i = 0 ; i < DEBUGLIST_COUNT ; i++)
				if (dl->ptr[i] != NULL)
					fprintf(out,
						"\tptr %p file %s line %u\n",
						dl->ptr[i], dl->file[i],
						dl->line[i]);
			dl = ISC_LIST_NEXT(dl, link);
		}
	}
#endif

Bob Halley's avatar
Bob Halley committed
1048
	UNLOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1049 1050
}

Bob Halley's avatar
Bob Halley committed
1051
isc_boolean_t
1052
isc_mem_valid(isc_mem_t *ctx, void *ptr) {
Bob Halley's avatar
Bob Halley committed
1053
	unsigned char *cp = ptr;
Bob Halley's avatar
Bob Halley committed
1054
	isc_boolean_t result = ISC_FALSE;
Bob Halley's avatar
base  
Bob Halley committed
1055

Bob Halley's avatar
Bob Halley committed
1056 1057
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1058 1059

	if (ctx->lowest != NULL && cp >= ctx->lowest && cp <= ctx->highest)
Bob Halley's avatar
Bob Halley committed
1060
		result = ISC_TRUE;
Bob Halley's avatar
base  
Bob Halley committed
1061

Bob Halley's avatar
Bob Halley committed
1062
	UNLOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1063

Bob Halley's avatar
Bob Halley committed
1064
	return (result);
Bob Halley's avatar
base  
Bob Halley committed
1065 1066 1067
}

/*
1068 1069
 * 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
1070 1071
 */

Michael Graff's avatar
Michael Graff committed
1072 1073
static void *
isc__mem_allocateunlocked(isc_mem_t *ctx, size_t size) {
Bob Halley's avatar
Bob Halley committed
1074
	size_info *si;
Bob Halley's avatar
base  
Bob Halley committed
1075 1076

	size += ALIGNMENT_SIZE;
Michael Graff's avatar
Michael Graff committed
1077
	si = mem_getunlocked(ctx, size);
Bob Halley's avatar
base  
Bob Halley committed
1078 1079
	if (si == NULL)
		return (NULL);
1080
	si->u.size = size;
Bob Halley's avatar
base  
Bob Halley committed
1081 1082 1083
	return (&si[1]);
}

1084
void *
Michael Graff's avatar
Michael Graff committed
1085
isc__mem_allocate(isc_mem_t *ctx, size_t size FLARG) {
1086 1087
	size_info *si;

Michael Graff's avatar
Michael Graff committed
1088
	REQUIRE(VALID_CONTEXT(ctx));
1089

Michael Graff's avatar
Michael Graff committed
1090 1091 1092 1093 1094 1095 1096
	LOCK(&ctx->lock);
	si = isc__mem_allocateunlocked(ctx, size);
#ifdef ISC_MEM_TRACKLINES
	if (si != NULL)
		ADD_TRACE(ctx, si, si[-1].u.size, file, line);
#endif
	UNLOCK(&ctx->lock);
1097

Michael Graff's avatar
Michael Graff committed
1098
	return (si);
1099 1100
}

Bob Halley's avatar
base  
Bob Halley committed
1101
void
Michael Graff's avatar
Michael Graff committed
1102
isc__mem_free(isc_mem_t *ctx, void *ptr FLARG) {
Bob Halley's avatar
Bob Halley committed
1103
	size_info *si;
Bob Halley's avatar
base  
Bob Halley committed
1104

Michael Graff's avatar
Michael Graff committed
1105 1106 1107
	REQUIRE(VALID_CONTEXT(ctx));
	REQUIRE(ptr != NULL);

Bob Halley's avatar
Bob Halley committed
1108
	si = &(((size_info *)ptr)[-1]);
Michael Graff's avatar
Michael Graff committed
1109 1110 1111 1112
	LOCK(&ctx->lock);
	DELETE_TRACE(ctx, ptr, si->u.size, file, line);
	mem_putunlocked(ctx, si, si->u.size);
	UNLOCK(&ctx->lock);
Bob Halley's avatar
base  
Bob Halley committed
1113 1114
}

Bob Halley's avatar
Bob Halley committed
1115 1116 1117 1118
/*
 * Other useful things.
 */

Bob Halley's avatar
Bob Halley committed
1119
char *
Michael Graff's avatar
Michael Graff committed
1120
isc__mem_strdup(isc_mem_t *mctx, const char *s FLARG) {
Bob Halley's avatar
Bob Halley committed
1121 1122 1123
	size_t len;
	char *ns;

Michael Graff's avatar
Michael Graff committed
1124 1125 1126
	REQUIRE(VALID_CONTEXT(mctx));
	REQUIRE(s != NULL);

Bob Halley's avatar
Bob Halley committed
1127 1128
	len = strlen(s);

Michael Graff's avatar
Michael Graff committed
1129
	ns = isc__mem_allocate(mctx, len + 1 FLARG_PASS);
1130

Michael Graff's avatar
Michael Graff committed
1131 1132
	if (ns != NULL)
		strncpy(ns, s, len + 1);
1133

Michael Graff's avatar
Michael Graff committed
1134
	return (ns);
1135 1136
}

1137 1138 1139 1140
void
isc_mem_setdestroycheck(isc_mem_t *ctx, isc_boolean_t flag) {
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx->lock);
1141

1142
	ctx->checkfree = flag;
1143

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	UNLOCK(&ctx->lock);
}

void
isc_mem_setsplit(isc_mem_t *ctx, isc_boolean_t flag) {
	REQUIRE(VALID_CONTEXT(ctx));
	LOCK(&ctx