xref: /titanic_41/usr/src/lib/libast/common/vmalloc/vmbest.c (revision d5ace9454616652a717c9831d949dffa319381f9)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2008 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #if defined(_UWIN) && defined(_BLD_ast)
23 
24 void _STUB_vmbest(){}
25 
26 #else
27 
28 #include	"vmhdr.h"
29 
30 /*	Best-fit allocation method. This is based on a best-fit strategy
31 **	using a splay tree for storage of lists of free blocks of the same
32 **	size. Recent free blocks may be cached for fast reuse.
33 **
34 **	Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
35 */
36 
37 #ifdef DEBUG
38 static int	N_free;		/* # of free calls			*/
39 static int	N_alloc;	/* # of alloc calls			*/
40 static int	N_resize;	/* # of resize calls			*/
41 static int	N_wild;		/* # allocated from the wild block	*/
42 static int	N_last;		/* # allocated from last free block	*/
43 static int	N_reclaim;	/* # of bestreclaim calls		*/
44 
45 #undef	VM_TRUST		/* always check for locking, etc.s	*/
46 #define	VM_TRUST	0
47 #endif /*DEBUG*/
48 
49 #define COMPACT		8	/* factor to decide when to compact	*/
50 
51 /* Check to see if a block is in the free tree */
52 #if __STD_C
53 static int vmintree(Block_t* node, Block_t* b)
54 #else
55 static int vmintree(node,b)
56 Block_t*	node;
57 Block_t*	b;
58 #endif
59 {	Block_t*	t;
60 
61 	for(t = node; t; t = LINK(t))
62 		if(t == b)
63 			return 1;
64 	if(LEFT(node) && vmintree(LEFT(node),b))
65 		return 1;
66 	if(RIGHT(node) && vmintree(RIGHT(node),b))
67 		return 1;
68 	return 0;
69 }
70 
71 #if __STD_C
72 static int vmonlist(Block_t* list, Block_t* b)
73 #else
74 static int vmonlist(list,b)
75 Block_t*	list;
76 Block_t*	b;
77 #endif
78 {
79 	for(; list; list = LINK(list))
80 		if(list == b)
81 			return 1;
82 	return 0;
83 }
84 
85 /* Check to see if a block is known to be free */
86 #if __STD_C
87 static int vmisfree(Vmdata_t* vd, Block_t* b)
88 #else
89 static int vmisfree(vd,b)
90 Vmdata_t*	vd;
91 Block_t*	b;
92 #endif
93 {
94 	if(SIZE(b) & (BUSY|JUNK|PFREE))
95 		return 0;
96 
97 	if(b == vd->wild)
98 		return 1;
99 
100 	if(SIZE(b) < MAXTINY)
101 		return vmonlist(TINY(vd)[INDEX(SIZE(b))], b);
102 
103 	if(vd->root)
104 		return vmintree(vd->root, b);
105 
106 	return 0;
107 }
108 
109 /* Check to see if a block is known to be junked */
110 #if __STD_C
111 static int vmisjunk(Vmdata_t* vd, Block_t* b)
112 #else
113 static int vmisjunk(vd,b)
114 Vmdata_t*	vd;
115 Block_t*	b;
116 #endif
117 {
118 	Block_t*	t;
119 
120 	if((SIZE(b)&BUSY) == 0 || (SIZE(b)&JUNK) == 0)
121 		return 0;
122 
123 	if(b == vd->free) /* recently freed */
124 		return 1;
125 
126 	/* check the list that b is supposed to be in */
127 	for(t = CACHE(vd)[C_INDEX(SIZE(b))]; t; t = LINK(t))
128 		if(t == b)
129 			return 1;
130 
131 	/* on occasions, b may be put onto the catch-all list */
132 	if(C_INDEX(SIZE(b)) < S_CACHE)
133 		for(t = CACHE(vd)[S_CACHE]; t; t = LINK(t))
134 			if(t == b)
135 				return 1;
136 
137 	return 0;
138 }
139 
140 /* check to see if the free tree is in good shape */
141 #if __STD_C
142 static int vmchktree(Block_t* node)
143 #else
144 static int vmchktree(node)
145 Block_t*	node;
146 #endif
147 {	Block_t*	t;
148 
149 	if(SIZE(node) & BITS)
150 		{ /**/ASSERT(0); return -1; }
151 
152 	for(t = LINK(node); t; t = LINK(t))
153 		if(SIZE(t) != SIZE(node))
154 			{ /**/ASSERT(0); return -1; }
155 
156 	if((t = LEFT(node)) )
157 	{	if(SIZE(t) >= SIZE(node) )
158 			{ /**/ASSERT(0); return -1; }
159 		else	return vmchktree(t);
160 	}
161 	if((t = RIGHT(node)) )
162 	{	if(SIZE(t) <= SIZE(node) )
163 			{ /**/ASSERT(0); return -1; }
164 		else	return vmchktree(t);
165 	}
166 
167 	return 0;
168 }
169 
170 #if __STD_C
171 int _vmbestcheck(Vmdata_t* vd, Block_t* freeb)
172 #else
173 int _vmbestcheck(vd, freeb)
174 Vmdata_t*	vd;
175 Block_t*	freeb; /* known to be free but not on any free list */
176 #endif
177 {
178 	reg Seg_t	*seg;
179 	reg Block_t	*b, *endb, *nextb;
180 	int		rv = 0;
181 
182 	if(!CHECK())
183 		return 0;
184 
185 	/* make sure the free tree is still in shape */
186 	if(vd->root && vmchktree(vd->root) < 0 )
187 		{ rv = -1; /**/ASSERT(0); }
188 
189 	for(seg = vd->seg; seg && rv == 0; seg = seg->next)
190 	{	b = SEGBLOCK(seg);
191 		endb = (Block_t*)(seg->baddr - sizeof(Head_t));
192 		for(; b < endb && rv == 0; b = nextb)
193 		{	nextb = (Block_t*)((Vmuchar_t*)DATA(b) + (SIZE(b)&~BITS) );
194 
195 			if(!ISBUSY(SIZE(b)) ) /* a completely free block */
196 			{	/* there should be no marked bits of any type */
197 				if(SIZE(b) & (BUSY|JUNK|PFREE) )
198 					{ rv = -1; /**/ASSERT(0); }
199 
200 				/* next block must be busy and marked PFREE */
201 				if(!ISBUSY(SIZE(nextb)) || !ISPFREE(SIZE(nextb)) )
202 					{ rv = -1; /**/ASSERT(0); }
203 
204 				/* must have a self-reference pointer */
205 				if(*SELF(b) != b)
206 					{ rv = -1; /**/ASSERT(0); }
207 
208 				/* segment pointer should be well-defined */
209 				if(!TINIEST(b) && SEG(b) != seg)
210 					{ rv = -1; /**/ASSERT(0); }
211 
212 				/* must be on a free list */
213 				if(b != freeb && !vmisfree(vd, b) )
214 					{ rv = -1; /**/ASSERT(0); }
215 			}
216 			else
217 			{	/* segment pointer should be well-defined */
218 				if(SEG(b) != seg)
219 					{ rv = -1; /**/ASSERT(0); }
220 
221 				/* next block should not be marked PFREE */
222 				if(ISPFREE(SIZE(nextb)) )
223 					{ rv = -1; /**/ASSERT(0); }
224 
225 				/* if PFREE, last block should be free */
226 				if(ISPFREE(SIZE(b)) && LAST(b) != freeb &&
227 				   !vmisfree(vd, LAST(b)) )
228 					{ rv = -1; /**/ASSERT(0); }
229 
230 				/* if free but unreclaimed, should be junk */
231 				if(ISJUNK(SIZE(b)) && !vmisjunk(vd, b))
232 					{ rv = -1; /**/ASSERT(0); }
233 			}
234 		}
235 	}
236 
237 	return rv;
238 }
239 
240 /* Tree rotation functions */
241 #define RROTATE(x,y)	(LEFT(x) = RIGHT(y), RIGHT(y) = (x), (x) = (y))
242 #define LROTATE(x,y)	(RIGHT(x) = LEFT(y), LEFT(y) = (x), (x) = (y))
243 #define RLINK(s,x)	((s) = LEFT(s) = (x))
244 #define LLINK(s,x)	((s) = RIGHT(s) = (x))
245 
246 /* Find and delete a suitable element in the free tree. */
247 #if __STD_C
248 static Block_t* bestsearch(Vmdata_t* vd, reg size_t size, Block_t* wanted)
249 #else
250 static Block_t* bestsearch(vd, size, wanted)
251 Vmdata_t*	vd;
252 reg size_t	size;
253 Block_t*	wanted;
254 #endif
255 {
256 	reg size_t	s;
257 	reg Block_t	*t, *root, *l, *r;
258 	Block_t		link;
259 
260 	/* extracting a tiniest block from its list */
261 	if((root = wanted) && size == TINYSIZE)
262 	{	reg Seg_t*	seg;
263 
264 		l = TLEFT(root);
265 		if((r = LINK(root)) )
266 			TLEFT(r) = l;
267 		if(l)
268 			LINK(l) = r;
269 		else	TINY(vd)[0] = r;
270 
271 		seg = vd->seg;
272 		if(!seg->next)
273 			SEG(root) = seg;
274 		else for(;; seg = seg->next)
275 		{	if((Vmuchar_t*)root > (Vmuchar_t*)seg->addr &&
276 			   (Vmuchar_t*)root < seg->baddr)
277 			{	SEG(root) = seg;
278 				break;
279 			}
280 		}
281 
282 		return root;
283 	}
284 
285 	/**/ASSERT(!vd->root || vmchktree(vd->root) == 0);
286 
287 	/* find the right one to delete */
288 	l = r = &link;
289 	if((root = vd->root) ) do
290 	{	/**/ ASSERT(!ISBITS(size) && !ISBITS(SIZE(root)));
291 		if(size == (s = SIZE(root)) )
292 			break;
293 		if(size < s)
294 		{	if((t = LEFT(root)) )
295 			{	if(size <= (s = SIZE(t)) )
296 				{	RROTATE(root,t);
297 					if(size == s)
298 						break;
299 					t = LEFT(root);
300 				}
301 				else
302 				{	LLINK(l,t);
303 					t = RIGHT(t);
304 				}
305 			}
306 			RLINK(r,root);
307 		}
308 		else
309 		{	if((t = RIGHT(root)) )
310 			{	if(size >= (s = SIZE(t)) )
311 				{	LROTATE(root,t);
312 					if(size == s)
313 						break;
314 					t = RIGHT(root);
315 				}
316 				else
317 				{	RLINK(r,t);
318 					t = LEFT(t);
319 				}
320 			}
321 			LLINK(l,root);
322 		}
323 		/**/ ASSERT(root != t);
324 	} while((root = t) );
325 
326 	if(root)	/* found it, now isolate it */
327 	{	RIGHT(l) = LEFT(root);
328 		LEFT(r) = RIGHT(root);
329 	}
330 	else		/* nothing exactly fit	*/
331 	{	LEFT(r) = NIL(Block_t*);
332 		RIGHT(l) = NIL(Block_t*);
333 
334 		/* grab the least one from the right tree */
335 		if((root = LEFT(&link)) )
336 		{	while((t = LEFT(root)) )
337 				RROTATE(root,t);
338 			LEFT(&link) = RIGHT(root);
339 		}
340 	}
341 
342 	if(root && (r = LINK(root)) )
343 	{	/* head of a link list, use next one for root */
344 		LEFT(r) = RIGHT(&link);
345 		RIGHT(r) = LEFT(&link);
346 	}
347 	else if(!(r = LEFT(&link)) )
348 		r = RIGHT(&link);
349 	else /* graft left tree to right tree */
350 	{	while((t = LEFT(r)) )
351 			RROTATE(r,t);
352 		LEFT(r) = RIGHT(&link);
353 	}
354 	vd->root = r; /**/ASSERT(!r || !ISBITS(SIZE(r)));
355 
356 	/**/ASSERT(!vd->root || vmchktree(vd->root) == 0);
357 	/**/ASSERT(!wanted || wanted == root);
358 
359 	return root;
360 }
361 
362 /* Reclaim all delayed free blocks into the free tree */
363 #if __STD_C
364 static int bestreclaim(reg Vmdata_t* vd, Block_t* wanted, int c)
365 #else
366 static int bestreclaim(vd, wanted, c)
367 reg Vmdata_t*	vd;
368 Block_t*	wanted;
369 int		c;
370 #endif
371 {
372 	reg size_t	size, s;
373 	reg Block_t	*fp, *np, *t, *list;
374 	reg int		n, saw_wanted;
375 	reg Seg_t	*seg;
376 
377 	/**/COUNT(N_reclaim);
378 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
379 
380 	if((fp = vd->free) )
381 	{	LINK(fp) = CACHE(vd)[S_CACHE]; CACHE(vd)[S_CACHE] = fp;
382 		vd->free = NIL(Block_t*);
383 	}
384 
385 	saw_wanted = wanted ? 0 : 1;
386 	for(n = S_CACHE; n >= c; --n)
387 	{	list = CACHE(vd)[n]; CACHE(vd)[n] = NIL(Block_t*);
388 		while((fp = list) )
389 		{	/* Note that below here we allow ISJUNK blocks to be
390 			** forward-merged even though they are not removed from
391 			** the list immediately. In this way, the list is
392 			** scanned only once. It works because the LINK and SIZE
393 			** fields are not destroyed during the merging. This can
394 			** be seen by observing that a tiniest block has a 2-word
395 			** header and a 2-word body. Merging a tiniest block
396 			** (1seg) and the next block (2seg) looks like this:
397 			**	1seg  size  link  left  2seg size link left ....
398 			**	1seg  size  link  left  rite xxxx xxxx .... self
399 			** After the merge, the 2seg word is replaced by the RIGHT
400 			** pointer of the new block and somewhere beyond the
401 			** two xxxx fields, the SELF pointer will replace some
402 			** other word. The important part is that the two xxxx
403 			** fields are kept intact.
404 			*/
405 			list = LINK(list); /**/ASSERT(!vmonlist(list,fp));
406 
407 			size = SIZE(fp);
408 			if(!ISJUNK(size))	/* already done */
409 				continue;
410 
411 			if(_Vmassert & VM_region)
412 			{	/* see if this address is from region */
413 				for(seg = vd->seg; seg; seg = seg->next)
414 					if(fp >= SEGBLOCK(seg) && fp < (Block_t*)seg->baddr )
415 						break;
416 				if(!seg) /* must be a bug in application code! */
417 				{	/**/ ASSERT(seg != NIL(Seg_t*));
418 					continue;
419 				}
420 			}
421 
422 			if(ISPFREE(size))	/* backward merge */
423 			{	fp = LAST(fp);
424 				s = SIZE(fp); /**/ASSERT(!(s&BITS));
425 				REMOVE(vd,fp,INDEX(s),t,bestsearch);
426 				size = (size&~BITS) + s + sizeof(Head_t);
427 			}
428 			else	size &= ~BITS;
429 
430 			for(;;)	/* forward merge */
431 			{	np = (Block_t*)((Vmuchar_t*)fp+size+sizeof(Head_t));
432 				s = SIZE(np);	/**/ASSERT(s > 0);
433 				if(!ISBUSY(s))
434 				{	/**/ASSERT((s&BITS) == 0);
435 					if(np == vd->wild)
436 						vd->wild = NIL(Block_t*);
437 					else	REMOVE(vd,np,INDEX(s),t,bestsearch);
438 				}
439 				else if(ISJUNK(s))
440 				{	/* reclaim any touched junk list */
441 					if((int)C_INDEX(s) < c)
442 						c = C_INDEX(s);
443 					SIZE(np) = 0;
444 					CLRBITS(s);
445 				}
446 				else	break;
447 				size += s + sizeof(Head_t);
448 			}
449 			SIZE(fp) = size;
450 
451 			/* tell next block that this one is free */
452 			np = NEXT(fp);	/**/ASSERT(ISBUSY(SIZE(np)));
453 					/**/ASSERT(!ISJUNK(SIZE(np)));
454 			SETPFREE(SIZE(np));
455 			*(SELF(fp)) = fp;
456 
457 			if(fp == wanted) /* to be consumed soon */
458 			{	/**/ASSERT(!saw_wanted); /* should be seen just once */
459 				saw_wanted = 1;
460 				continue;
461 			}
462 
463 			/* wilderness preservation */
464 			if(np->body.data >= vd->seg->baddr)
465 			{	vd->wild = fp;
466 				continue;
467 			}
468 
469 			/* tiny block goes to tiny list */
470 			if(size < MAXTINY)
471 			{	s = INDEX(size);
472 				np = LINK(fp) = TINY(vd)[s];
473 				if(s == 0)	/* TINIEST block */
474 				{	if(np)
475 						TLEFT(np) = fp;
476 					TLEFT(fp) = NIL(Block_t*);
477 				}
478 				else
479 				{	if(np)
480 						LEFT(np)  = fp;
481 					LEFT(fp) = NIL(Block_t*);
482 					SETLINK(fp);
483 				}
484 				TINY(vd)[s] = fp;
485 				continue;
486 			}
487 
488 			LEFT(fp) = RIGHT(fp) = LINK(fp) = NIL(Block_t*);
489 			if(!(np = vd->root) )	/* inserting into an empty tree	*/
490 			{	vd->root = fp;
491 				continue;
492 			}
493 
494 			size = SIZE(fp);
495 			while(1)	/* leaf insertion */
496 			{	/**/ASSERT(np != fp);
497 				if((s = SIZE(np)) > size)
498 				{	if((t = LEFT(np)) )
499 					{	/**/ ASSERT(np != t);
500 						np = t;
501 					}
502 					else
503 					{	LEFT(np) = fp;
504 						break;
505 					}
506 				}
507 				else if(s < size)
508 				{	if((t = RIGHT(np)) )
509 					{	/**/ ASSERT(np != t);
510 						np = t;
511 					}
512 					else
513 					{	RIGHT(np) = fp;
514 						break;
515 					}
516 				}
517 				else /* s == size */
518 				{	if((t = LINK(np)) )
519 					{	LINK(fp) = t;
520 						LEFT(t) = fp;
521 					}
522 					LINK(np) = fp;
523 					LEFT(fp) = np;
524 					SETLINK(fp);
525 					break;
526 				}
527 			}
528 		}
529 	}
530 
531 	/**/ASSERT(!wanted || saw_wanted == 1);
532 	/**/ASSERT(_vmbestcheck(vd, wanted) == 0);
533 	return saw_wanted;
534 }
535 
536 #if __STD_C
537 static int bestcompact(Vmalloc_t* vm)
538 #else
539 static int bestcompact(vm)
540 Vmalloc_t*	vm;
541 #endif
542 {
543 	reg Seg_t	*seg, *next;
544 	reg Block_t	*bp, *t;
545 	reg size_t	size, segsize, round;
546 	reg int		local, inuse;
547 	reg Vmdata_t*	vd = vm->data;
548 
549 	SETINUSE(vd, inuse);
550 
551 	if(!(local = vd->mode&VM_TRUST) )
552 	{	GETLOCAL(vd,local);
553 		if(ISLOCK(vd,local))
554 		{	CLRINUSE(vd, inuse);
555 			return -1;
556 		}
557 		SETLOCK(vd,local);
558 	}
559 
560 	bestreclaim(vd,NIL(Block_t*),0);
561 
562 	for(seg = vd->seg; seg; seg = next)
563 	{	next = seg->next;
564 
565 		bp = BLOCK(seg->baddr);
566 		if(!ISPFREE(SIZE(bp)) )
567 			continue;
568 
569 		bp = LAST(bp);	/**/ASSERT(vmisfree(vd,bp));
570 		size = SIZE(bp);
571 		if(bp == vd->wild)
572 		{	/* During large block allocations, _Vmextend might
573 			** have been enlarged the rounding factor. Reducing
574 			** it a bit help avoiding getting large raw memory.
575 			*/
576 			if((round = vm->disc->round) == 0)
577 				round = _Vmpagesize;
578 			if(size > COMPACT*vd->incr && vd->incr > round)
579 				vd->incr /= 2;
580 
581 			/* for the bottom segment, we don't necessarily want
582 			** to return raw memory too early. vd->pool has an
583 			** approximation of the average size of recently freed
584 			** blocks. If this is large, the application is managing
585 			** large blocks so we throttle back memory chopping
586 			** to avoid thrashing the underlying memory system.
587 			*/
588 			if(size <= COMPACT*vd->incr || size <= COMPACT*vd->pool)
589 				continue;
590 
591 			vd->wild = NIL(Block_t*);
592 			vd->pool = 0;
593 		}
594 		else	REMOVE(vd,bp,INDEX(size),t,bestsearch);
595 		CLRPFREE(SIZE(NEXT(bp)));
596 
597 		if(size < (segsize = seg->size))
598 			size += sizeof(Head_t);
599 
600 		if((size = (*_Vmtruncate)(vm,seg,size,0)) > 0)
601 		{	if(size >= segsize) /* entire segment deleted */
602 				continue;
603 			/**/ASSERT(SEG(BLOCK(seg->baddr)) == seg);
604 
605 			if((size = (seg->baddr - ((Vmuchar_t*)bp) - sizeof(Head_t))) > 0)
606 				SIZE(bp) = size - sizeof(Head_t);
607 			else	bp = NIL(Block_t*);
608 		}
609 
610 		if(bp)
611 		{	/**/ ASSERT(SIZE(bp) >= BODYSIZE);
612 			/**/ ASSERT(SEGWILD(bp));
613 			/**/ ASSERT(!vd->root || !vmintree(vd->root,bp));
614 			SIZE(bp) |= BUSY|JUNK;
615 			LINK(bp) = CACHE(vd)[C_INDEX(SIZE(bp))];
616 			CACHE(vd)[C_INDEX(SIZE(bp))] = bp;
617 		}
618 	}
619 
620 	if(!local && _Vmtrace && (vd->mode&VM_TRACE) && VMETHOD(vd) == VM_MTBEST)
621 		(*_Vmtrace)(vm, (Vmuchar_t*)0, (Vmuchar_t*)0, 0, 0);
622 
623 	CLRLOCK(vd,local); /**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
624 
625 	CLRINUSE(vd, inuse);
626 	return 0;
627 }
628 
629 #if __STD_C
630 static Void_t* bestalloc(Vmalloc_t* vm, reg size_t size )
631 #else
632 static Void_t* bestalloc(vm,size)
633 Vmalloc_t*	vm;	/* region allocating from	*/
634 reg size_t	size;	/* desired block size		*/
635 #endif
636 {
637 	reg Vmdata_t*	vd = vm->data;
638 	reg size_t	s;
639 	reg int		n;
640 	reg Block_t	*tp, *np;
641 	reg int		local, inuse;
642 	size_t		orgsize = 0;
643 
644 	if(!(_Vmassert & VM_init))
645 	{	char	*chk = getenv("VMCHECK");
646 		_Vmassert = VM_init;
647 		if(chk)
648 		{	int	set = 1;
649 			for(;; set ? (_Vmassert |= n) : (_Vmassert &= ~n))
650 			{
651 				switch (*chk++)
652 				{
653 				case 0:
654 					break;
655 				case '-':
656 				case '!':
657 					set = 0;
658 					n = 0;
659 					continue;
660 				case '+':
661 					set = 1;
662 					n = 0;
663 					continue;
664 				case '1':
665 					n = VM_check;
666 					continue;
667 				case '2':
668 					n = VM_abort;
669 					continue;
670 				case '3':
671 					n = VM_check|VM_abort;
672 					continue;
673 				case 'a':
674 				case 'A':
675 					n = VM_abort;
676 					continue;
677 				case 'c':
678 				case 'C':
679 					n = VM_check;
680 					continue;
681 #if _mem_mmap_anon || _mem_mmap_zero
682 				case 'm':
683 				case 'M':
684 					n = VM_mmap;
685 #endif
686 					continue;
687 				case 'r':
688 				case 'R':
689 					n = VM_region;
690 					continue;
691 				default:
692 					n = 0;
693 					continue;
694 				}
695 				break;
696 			}
697 		}
698 	}
699 	/**/COUNT(N_alloc);
700 
701 	SETINUSE(vd, inuse);
702 
703 	if(!(local = vd->mode&VM_TRUST))
704 	{	GETLOCAL(vd,local);	/**/ASSERT(!ISLOCK(vd,local));
705 		if(ISLOCK(vd,local) )
706 		{	CLRINUSE(vd, inuse);
707 			return NIL(Void_t*);
708 		}
709 		SETLOCK(vd,local);
710 		orgsize = size;
711 	}
712 
713 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
714 	/**/ ASSERT(HEADSIZE == sizeof(Head_t));
715 	/**/ ASSERT(BODYSIZE == sizeof(Body_t));
716 	/**/ ASSERT((ALIGN%(BITS+1)) == 0 );
717 	/**/ ASSERT((sizeof(Head_t)%ALIGN) == 0 );
718 	/**/ ASSERT((sizeof(Body_t)%ALIGN) == 0 );
719 	/**/ ASSERT((BODYSIZE%ALIGN) == 0 );
720 	/**/ ASSERT(sizeof(Block_t) == (sizeof(Body_t)+sizeof(Head_t)) );
721 
722 	/* for ANSI requirement that malloc(0) returns non-NULL pointer */
723 	size = size <= BODYSIZE ? BODYSIZE : ROUND(size,ALIGN);
724 
725 	if((tp = vd->free) )	/* reuse last free piece if appropriate */
726 	{	/**/ASSERT(ISBUSY(SIZE(tp)) );
727 		/**/ASSERT(ISJUNK(SIZE(tp)) );
728 		/**/COUNT(N_last);
729 
730 		vd->free = NIL(Block_t*);
731 		if((s = SIZE(tp)) >= size && s < (size << 1) )
732 		{	if(s >= size + (sizeof(Head_t)+BODYSIZE) )
733 			{	SIZE(tp) = size;
734 				np = NEXT(tp);
735 				SEG(np) = SEG(tp);
736 				SIZE(np) = ((s&~BITS) - (size+sizeof(Head_t)))|JUNK|BUSY;
737 				vd->free = np;
738 				SIZE(tp) |= s&BITS;
739 			}
740 			CLRJUNK(SIZE(tp));
741 			goto done;
742 		}
743 
744 		LINK(tp) = CACHE(vd)[S_CACHE];
745 		CACHE(vd)[S_CACHE] = tp;
746 	}
747 
748 	for(;;)
749 	{	for(n = S_CACHE; n >= 0; --n)	/* best-fit except for coalescing */
750 		{	bestreclaim(vd,NIL(Block_t*),n);
751 			if(vd->root && (tp = bestsearch(vd,size,NIL(Block_t*))) )
752 				goto got_block;
753 		}
754 
755 		/**/ASSERT(!vd->free);
756 		if((tp = vd->wild) && SIZE(tp) >= size)
757 		{	/**/COUNT(N_wild);
758 			vd->wild = NIL(Block_t*);
759 			goto got_block;
760 		}
761 
762 		KPVCOMPACT(vm,bestcompact);
763 		if((tp = (*_Vmextend)(vm,size,bestsearch)) )
764 			goto got_block;
765 		else if(vd->mode&VM_AGAIN)
766 			vd->mode &= ~VM_AGAIN;
767 		else
768 		{	CLRLOCK(vd,local);
769 			CLRINUSE(vd, inuse);
770 			return NIL(Void_t*);
771 		}
772 	}
773 
774 got_block:
775 	/**/ ASSERT(!ISBITS(SIZE(tp)));
776 	/**/ ASSERT(SIZE(tp) >= size);
777 	/**/ ASSERT((SIZE(tp)%ALIGN) == 0);
778 	/**/ ASSERT(!vd->free);
779 
780 	/* tell next block that we are no longer a free block */
781 	CLRPFREE(SIZE(NEXT(tp)));	/**/ ASSERT(ISBUSY(SIZE(NEXT(tp))));
782 
783 	if((s = SIZE(tp)-size) >= (sizeof(Head_t)+BODYSIZE) )
784 	{	SIZE(tp) = size;
785 
786 		np = NEXT(tp);
787 		SEG(np) = SEG(tp);
788 		SIZE(np) = (s - sizeof(Head_t)) | BUSY|JUNK;
789 
790 		if(VMWILD(vd,np))
791 		{	SIZE(np) &= ~BITS;
792 			*SELF(np) = np; /**/ASSERT(ISBUSY(SIZE(NEXT(np))));
793 			SETPFREE(SIZE(NEXT(np)));
794 			vd->wild = np;
795 		}
796 		else	vd->free = np;
797 	}
798 
799 	SETBUSY(SIZE(tp));
800 
801 done:
802 	if(!local && (vd->mode&VM_TRACE) && _Vmtrace && VMETHOD(vd) == VM_MTBEST)
803 		(*_Vmtrace)(vm,NIL(Vmuchar_t*),(Vmuchar_t*)DATA(tp),orgsize,0);
804 
805 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
806 	CLRLOCK(vd,local);
807 	ANNOUNCE(local, vm, VM_ALLOC, DATA(tp), vm->disc);
808 
809 	CLRINUSE(vd, inuse);
810 	return DATA(tp);
811 }
812 
813 #if __STD_C
814 static long bestaddr(Vmalloc_t* vm, Void_t* addr )
815 #else
816 static long bestaddr(vm, addr)
817 Vmalloc_t*	vm;	/* region allocating from	*/
818 Void_t*		addr;	/* address to check		*/
819 #endif
820 {
821 	reg Seg_t*	seg;
822 	reg Block_t	*b, *endb;
823 	reg long	offset;
824 	reg Vmdata_t*	vd = vm->data;
825 	reg int		local, inuse;
826 
827 	SETINUSE(vd, inuse);
828 
829 	if(!(local = vd->mode&VM_TRUST) )
830 	{	GETLOCAL(vd,local); /**/ASSERT(!ISLOCK(vd,local));
831 		if(ISLOCK(vd,local))
832 		{	CLRINUSE(vd, inuse);
833 			return -1L;
834 		}
835 		SETLOCK(vd,local);
836 	}
837 
838 	offset = -1L; b = endb = NIL(Block_t*);
839 	for(seg = vd->seg; seg; seg = seg->next)
840 	{	b = SEGBLOCK(seg);
841 		endb = (Block_t*)(seg->baddr - sizeof(Head_t));
842 		if((Vmuchar_t*)addr > (Vmuchar_t*)b &&
843 		   (Vmuchar_t*)addr < (Vmuchar_t*)endb)
844 			break;
845 	}
846 
847 	if(local && !(vd->mode&VM_TRUST) ) /* from bestfree or bestresize */
848 	{	b = BLOCK(addr);
849 		if(seg && SEG(b) == seg && ISBUSY(SIZE(b)) && !ISJUNK(SIZE(b)) )
850 			offset = 0;
851 		if(offset != 0 && vm->disc->exceptf)
852 			(void)(*vm->disc->exceptf)(vm,VM_BADADDR,addr,vm->disc);
853 	}
854 	else if(seg)
855 	{	while(b < endb)
856 		{	reg Vmuchar_t*	data = (Vmuchar_t*)DATA(b);
857 			reg size_t	size = SIZE(b)&~BITS;
858 
859 			if((Vmuchar_t*)addr >= data && (Vmuchar_t*)addr < data+size)
860 			{	if(ISJUNK(SIZE(b)) || !ISBUSY(SIZE(b)))
861 					offset = -1L;
862 				else	offset = (Vmuchar_t*)addr - data;
863 				goto done;
864 			}
865 
866 			b = (Block_t*)((Vmuchar_t*)DATA(b) + size);
867 		}
868 	}
869 
870 done:
871 	CLRLOCK(vd,local);
872 	CLRINUSE(vd, inuse);
873 	return offset;
874 }
875 
876 #if __STD_C
877 static int bestfree(Vmalloc_t* vm, Void_t* data )
878 #else
879 static int bestfree(vm, data )
880 Vmalloc_t*	vm;
881 Void_t*		data;
882 #endif
883 {
884 	reg Vmdata_t*	vd = vm->data;
885 	reg Block_t	*bp;
886 	reg size_t	s;
887 	reg int		local, inuse;
888 
889 #ifdef DEBUG
890 	if((local = (int)data) >= 0 && local <= 0xf)
891 	{	int	vmassert = _Vmassert;
892 		_Vmassert = local ? local : vmassert ? vmassert : (VM_check|VM_abort);
893 		_vmbestcheck(vd, NIL(Block_t*));
894 		_Vmassert = local ? local : vmassert;
895 		return 0;
896 	}
897 #endif
898 
899 	if(!data) /* ANSI-ism */
900 		return 0;
901 
902 	/**/COUNT(N_free);
903 
904 	SETINUSE(vd, inuse);
905 
906 	if(!(local = vd->mode&VM_TRUST) )
907 	{	GETLOCAL(vd,local);	/**/ASSERT(!ISLOCK(vd,local));
908 		if(ISLOCK(vd,local) || KPVADDR(vm,data,bestaddr) != 0 )
909 		{	CLRINUSE(vd, inuse);
910 			return -1;
911 		}
912 		SETLOCK(vd,local);
913 	}
914 
915 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
916 	bp = BLOCK(data); s = SIZE(bp);
917 
918 	/* Keep an approximate average free block size.
919 	** This is used in bestcompact() to decide when to release
920 	** raw memory back to the underlying memory system.
921 	*/
922 	vd->pool = (vd->pool + (s&~BITS))/2;
923 
924 	if(ISBUSY(s) && !ISJUNK(s))
925 	{	SETJUNK(SIZE(bp));
926 	        if(s < MAXCACHE)
927 	        {       /**/ASSERT(!vmonlist(CACHE(vd)[INDEX(s)], bp) );
928 	                LINK(bp) = CACHE(vd)[INDEX(s)];
929 	                CACHE(vd)[INDEX(s)] = bp;
930 	        }
931 	        else if(!vd->free)
932 	                vd->free = bp;
933 	        else
934 	        {       /**/ASSERT(!vmonlist(CACHE(vd)[S_CACHE], bp) );
935 	                LINK(bp) = CACHE(vd)[S_CACHE];
936 	                CACHE(vd)[S_CACHE] = bp;
937 	        }
938 
939 		/* coalesce on freeing large blocks to avoid fragmentation */
940 		if(SIZE(bp) >= 2*vd->incr)
941 		{	bestreclaim(vd,NIL(Block_t*),0);
942 			if(vd->wild && SIZE(vd->wild) >= COMPACT*vd->incr)
943 				KPVCOMPACT(vm,bestcompact);
944 		}
945 	}
946 
947 	if(!local && _Vmtrace && (vd->mode&VM_TRACE) && VMETHOD(vd) == VM_MTBEST )
948 		(*_Vmtrace)(vm,(Vmuchar_t*)data,NIL(Vmuchar_t*), (s&~BITS), 0);
949 
950 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
951 	CLRLOCK(vd,local);
952 	ANNOUNCE(local, vm, VM_FREE, data, vm->disc);
953 
954 	CLRINUSE(vd, inuse);
955 	return 0;
956 }
957 
958 #if __STD_C
959 static Void_t* bestresize(Vmalloc_t* vm, Void_t* data, reg size_t size, int type)
960 #else
961 static Void_t* bestresize(vm,data,size,type)
962 Vmalloc_t*	vm;		/* region allocating from	*/
963 Void_t*		data;		/* old block of data		*/
964 reg size_t	size;		/* new size			*/
965 int		type;		/* !=0 to move, <0 for not copy */
966 #endif
967 {
968 	reg Block_t	*rp, *np, *t;
969 	int		local, inuse;
970 	size_t		s, bs, oldsize = 0, orgsize = 0;
971 	Void_t		*oldd, *orgdata = NIL(Void_t*);
972 	Vmdata_t	*vd = vm->data;
973 
974 	/**/COUNT(N_resize);
975 
976 	SETINUSE(vd, inuse);
977 
978 	if(!data)
979 	{	if((data = bestalloc(vm,size)) )
980 		{	oldsize = 0;
981 			size = size <= BODYSIZE ? BODYSIZE : ROUND(size,ALIGN);
982 		}
983 		goto done;
984 	}
985 	if(size == 0)
986 	{	(void)bestfree(vm,data);
987 		CLRINUSE(vd, inuse);
988 		return NIL(Void_t*);
989 	}
990 
991 	if(!(local = vd->mode&VM_TRUST) )
992 	{	GETLOCAL(vd,local); /**/ASSERT(!ISLOCK(vd,local));
993 		if(ISLOCK(vd,local) || (!local && KPVADDR(vm,data,bestaddr) != 0 ) )
994 		{	CLRINUSE(vd, inuse);
995 			return NIL(Void_t*);
996 		}
997 		SETLOCK(vd,local);
998 
999 		orgdata = data;	/* for tracing */
1000 		orgsize = size;
1001 	}
1002 
1003 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
1004 	size = size <= BODYSIZE ? BODYSIZE : ROUND(size,ALIGN);
1005 	rp = BLOCK(data);	/**/ASSERT(ISBUSY(SIZE(rp)) && !ISJUNK(SIZE(rp)));
1006 	oldsize = SIZE(rp); CLRBITS(oldsize);
1007 	if(oldsize < size)
1008 	{	np = (Block_t*)((Vmuchar_t*)rp + oldsize + sizeof(Head_t));
1009 		do	/* forward merge as much as possible */
1010 		{	s = SIZE(np); /**/ASSERT(!ISPFREE(s));
1011 			if(np == vd->free)
1012 			{	vd->free = NIL(Block_t*);
1013 				CLRBITS(s);
1014 			}
1015 			else if(ISJUNK(s) )
1016 			{	if(!bestreclaim(vd,np,C_INDEX(s)) )
1017 					/**/ASSERT(0); /* oops: did not see np! */
1018 				s = SIZE(np); /**/ASSERT(s%ALIGN == 0);
1019 			}
1020 			else if(!ISBUSY(s) )
1021 			{	if(np == vd->wild)
1022 					vd->wild = NIL(Block_t*);
1023 				else	REMOVE(vd,np,INDEX(s),t,bestsearch);
1024 			}
1025 			else	break;
1026 
1027 			SIZE(rp) += (s += sizeof(Head_t)); /**/ASSERT((s%ALIGN) == 0);
1028 			np = (Block_t*)((Vmuchar_t*)np + s);
1029 			CLRPFREE(SIZE(np));
1030 		} while(SIZE(rp) < size);
1031 
1032 		if(SIZE(rp) < size && size > vd->incr && SEGWILD(rp) )
1033 		{	reg Seg_t*	seg;
1034 
1035 			s = (size - SIZE(rp)) + sizeof(Head_t); s = ROUND(s,vd->incr);
1036 			seg = SEG(rp);
1037 			if((*vm->disc->memoryf)(vm,seg->addr,seg->extent,seg->extent+s,
1038 				      vm->disc) == seg->addr )
1039 			{	SIZE(rp) += s;
1040 				seg->extent += s;
1041 				seg->size += s;
1042 				seg->baddr += s;
1043 				s  = (SIZE(rp)&~BITS) + sizeof(Head_t);
1044 				np = (Block_t*)((Vmuchar_t*)rp + s);
1045 				SEG(np) = seg;
1046 				SIZE(np) = BUSY;
1047 			}
1048 		}
1049 	}
1050 
1051 	if((s = SIZE(rp)) >= (size + (BODYSIZE+sizeof(Head_t))) )
1052 	{	SIZE(rp) = size;
1053 		np = NEXT(rp);
1054 		SEG(np) = SEG(rp);
1055 		SIZE(np) = (((s&~BITS)-size) - sizeof(Head_t))|BUSY|JUNK;
1056 		CPYBITS(SIZE(rp),s);
1057 		rp = np;
1058 		goto do_free;
1059 	}
1060 	else if((bs = s&~BITS) < size)
1061 	{	if(!(type&(VM_RSMOVE|VM_RSCOPY)) )
1062 			data = NIL(Void_t*); /* old data is not moveable */
1063 		else
1064 		{	oldd = data;
1065 			if((data = KPVALLOC(vm,size,bestalloc)) )
1066 			{	if(type&VM_RSCOPY)
1067 					memcpy(data, oldd, bs);
1068 
1069 			do_free: /* reclaim these right away */
1070 				SETJUNK(SIZE(rp));
1071 				LINK(rp) = CACHE(vd)[S_CACHE];
1072 				CACHE(vd)[S_CACHE] = rp;
1073 				bestreclaim(vd, NIL(Block_t*), S_CACHE);
1074 			}
1075 		}
1076 	}
1077 
1078 	if(!local && _Vmtrace && data && (vd->mode&VM_TRACE) && VMETHOD(vd) == VM_MTBEST)
1079 		(*_Vmtrace)(vm, (Vmuchar_t*)orgdata, (Vmuchar_t*)data, orgsize, 0);
1080 
1081 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
1082 	CLRLOCK(vd,local);
1083 	ANNOUNCE(local, vm, VM_RESIZE, data, vm->disc);
1084 
1085 done:	if(data && (type&VM_RSZERO) && (size = SIZE(BLOCK(data))&~BITS) > oldsize )
1086 		memset((Void_t*)((Vmuchar_t*)data + oldsize), 0, size-oldsize);
1087 
1088 	CLRINUSE(vd, inuse);
1089 	return data;
1090 }
1091 
1092 #if __STD_C
1093 static long bestsize(Vmalloc_t* vm, Void_t* addr )
1094 #else
1095 static long bestsize(vm, addr)
1096 Vmalloc_t*	vm;	/* region allocating from	*/
1097 Void_t*		addr;	/* address to check		*/
1098 #endif
1099 {
1100 	reg Seg_t*	seg;
1101 	reg Block_t	*b, *endb;
1102 	reg long	size;
1103 	reg Vmdata_t*	vd = vm->data;
1104 	reg int		inuse;
1105 
1106 	SETINUSE(vd, inuse);
1107 
1108 	if(!(vd->mode&VM_TRUST) )
1109 	{	if(ISLOCK(vd,0))
1110 		{	CLRINUSE(vd, inuse);
1111 			return -1L;
1112 		}
1113 		SETLOCK(vd,0);
1114 	}
1115 
1116 	size = -1L;
1117 	for(seg = vd->seg; seg; seg = seg->next)
1118 	{	b = SEGBLOCK(seg);
1119 		endb = (Block_t*)(seg->baddr - sizeof(Head_t));
1120 		if((Vmuchar_t*)addr <= (Vmuchar_t*)b ||
1121 		   (Vmuchar_t*)addr >= (Vmuchar_t*)endb)
1122 			continue;
1123 		while(b < endb)
1124 		{	if(addr == DATA(b))
1125 			{	if(!ISBUSY(SIZE(b)) || ISJUNK(SIZE(b)) )
1126 					size = -1L;
1127 				else	size = (long)SIZE(b)&~BITS;
1128 				goto done;
1129 			}
1130 			else if((Vmuchar_t*)addr <= (Vmuchar_t*)b)
1131 				break;
1132 
1133 			b = (Block_t*)((Vmuchar_t*)DATA(b) + (SIZE(b)&~BITS) );
1134 		}
1135 	}
1136 
1137 done:
1138 	CLRLOCK(vd,0);
1139 	CLRINUSE(vd, inuse);
1140 	return size;
1141 }
1142 
1143 #if __STD_C
1144 static Void_t* bestalign(Vmalloc_t* vm, size_t size, size_t align)
1145 #else
1146 static Void_t* bestalign(vm, size, align)
1147 Vmalloc_t*	vm;
1148 size_t		size;
1149 size_t		align;
1150 #endif
1151 {
1152 	reg Vmuchar_t	*data;
1153 	reg Block_t	*tp, *np;
1154 	reg Seg_t*	seg;
1155 	reg int		local, inuse;
1156 	reg size_t	s, extra, orgsize = 0, orgalign = 0;
1157 	reg Vmdata_t*	vd = vm->data;
1158 
1159 	if(size <= 0 || align <= 0)
1160 		return NIL(Void_t*);
1161 
1162 	SETINUSE(vd, inuse);
1163 
1164 	if(!(local = vd->mode&VM_TRUST) )
1165 	{	GETLOCAL(vd,local); /**/ASSERT(!ISLOCK(vd,local));
1166 		if(ISLOCK(vd,local) )
1167 		{	CLRINUSE(vd, inuse);
1168 			return NIL(Void_t*);
1169 		}
1170 		SETLOCK(vd,local);
1171 		orgsize = size;
1172 		orgalign = align;
1173 	}
1174 
1175 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
1176 	size = size <= BODYSIZE ? BODYSIZE : ROUND(size,ALIGN);
1177 	align = MULTIPLE(align,ALIGN);
1178 
1179 	/* hack so that dbalign() can store header data */
1180 	if(VMETHOD(vd) != VM_MTDEBUG)
1181 		extra = 0;
1182 	else
1183 	{	extra = DB_HEAD;
1184 		while(align < extra || (align - extra) < sizeof(Block_t))
1185 			align *= 2;
1186 	}
1187 
1188 	/* reclaim all free blocks now to avoid fragmentation */
1189 	bestreclaim(vd,NIL(Block_t*),0);
1190 
1191 	s = size + 2*(align+sizeof(Head_t)+extra);
1192 	if(!(data = (Vmuchar_t*)KPVALLOC(vm,s,bestalloc)) )
1193 		goto done;
1194 
1195 	tp = BLOCK(data);
1196 	seg = SEG(tp);
1197 
1198 	/* get an aligned address that we can live with */
1199 	if((s = (size_t)((VLONG(data)+extra)%align)) != 0)
1200 		data += align-s; /**/ASSERT(((VLONG(data)+extra)%align) == 0);
1201 
1202 	if((np = BLOCK(data)) != tp ) /* need to free left part */
1203 	{	if(((Vmuchar_t*)np - (Vmuchar_t*)tp) < (ssize_t)(sizeof(Block_t)+extra) )
1204 		{	data += align;
1205 			np = BLOCK(data);
1206 		} /**/ASSERT(((VLONG(data)+extra)%align) == 0);
1207 
1208 		s  = (Vmuchar_t*)np - (Vmuchar_t*)tp;
1209 		SIZE(np) = ((SIZE(tp)&~BITS) - s)|BUSY;
1210 		SEG(np) = seg;
1211 
1212 		SIZE(tp) = (s - sizeof(Head_t)) | (SIZE(tp)&BITS) | JUNK;
1213 		/**/ ASSERT(SIZE(tp) >= sizeof(Body_t) );
1214 		LINK(tp) = CACHE(vd)[C_INDEX(SIZE(tp))];
1215 		CACHE(vd)[C_INDEX(SIZE(tp))] = tp;
1216 	}
1217 
1218 	/* free left-over if too big */
1219 	if((s = SIZE(np) - size) >= sizeof(Block_t))
1220 	{	SIZE(np) = size;
1221 
1222 		tp = NEXT(np);
1223 		SIZE(tp) = ((s & ~BITS) - sizeof(Head_t)) | BUSY | JUNK;
1224 		SEG(tp) = seg;
1225 		LINK(tp) = CACHE(vd)[C_INDEX(SIZE(tp))];
1226 		CACHE(vd)[C_INDEX(SIZE(tp))] = tp;
1227 
1228 		SIZE(np) |= s&BITS;
1229 	}
1230 
1231 	bestreclaim(vd,NIL(Block_t*),0); /* coalesce all free blocks */
1232 
1233 	if(!local && !(vd->mode&VM_TRUST) && _Vmtrace && (vd->mode&VM_TRACE) )
1234 		(*_Vmtrace)(vm,NIL(Vmuchar_t*),data,orgsize,orgalign);
1235 
1236 done:
1237 	/**/ASSERT(_vmbestcheck(vd, NIL(Block_t*)) == 0);
1238 	CLRLOCK(vd,local);
1239 	ANNOUNCE(local, vm, VM_ALLOC, (Void_t*)data, vm->disc);
1240 
1241 	CLRINUSE(vd, inuse);
1242 	return (Void_t*)data;
1243 }
1244 
1245 
1246 #if _mem_win32
1247 #if _PACKAGE_ast
1248 #include		<ast_windows.h>
1249 #else
1250 #include		<windows.h>
1251 #endif
1252 #endif /* _lib_win32 */
1253 
1254 #if _mem_mmap_anon
1255 #include		<sys/mman.h>
1256 #ifndef MAP_ANON
1257 #define	MAP_ANON	MAP_ANONYMOUS
1258 #endif
1259 #endif /* _mem_mmap_anon */
1260 
1261 #if _mem_mmap_zero
1262 #include		<sys/fcntl.h>
1263 #include		<sys/mman.h>
1264 typedef struct _mmapdisc_s
1265 {	Vmdisc_t	disc;
1266 	int		fd;
1267 	off_t		offset;
1268 } Mmapdisc_t;
1269 
1270 #ifndef OPEN_MAX
1271 #define	OPEN_MAX	64
1272 #endif
1273 #define OPEN_PRIVATE	(3*OPEN_MAX/4)
1274 #endif /* _mem_mmap_zero */
1275 
1276 /* failure mode of mmap, sbrk and brk */
1277 #ifndef MAP_FAILED
1278 #define MAP_FAILED	((Void_t*)(-1))
1279 #endif
1280 #define BRK_FAILED	((Void_t*)(-1))
1281 
1282 /* A discipline to get raw memory using sbrk/VirtualAlloc/mmap */
1283 #if __STD_C
1284 static Void_t* sbrkmem(Vmalloc_t* vm, Void_t* caddr,
1285 			size_t csize, size_t nsize, Vmdisc_t* disc)
1286 #else
1287 static Void_t* sbrkmem(vm, caddr, csize, nsize, disc)
1288 Vmalloc_t*	vm;	/* region doing allocation from		*/
1289 Void_t*		caddr;	/* current address			*/
1290 size_t		csize;	/* current size				*/
1291 size_t		nsize;	/* new size				*/
1292 Vmdisc_t*	disc;	/* discipline structure			*/
1293 #endif
1294 {
1295 #undef _done_sbrkmem
1296 
1297 #if !defined(_done_sbrkmem) && defined(_mem_win32)
1298 #define _done_sbrkmem	1
1299 	NOTUSED(vm);
1300 	NOTUSED(disc);
1301 	if(csize == 0)
1302 		return (Void_t*)VirtualAlloc(0,nsize,MEM_COMMIT,PAGE_READWRITE);
1303 	else if(nsize == 0)
1304 		return VirtualFree((LPVOID)caddr,0,MEM_RELEASE) ? caddr : NIL(Void_t*);
1305 	else	return NIL(Void_t*);
1306 #endif /* MUST_WIN32 */
1307 
1308 #if !defined(_done_sbrkmem) && (_mem_sbrk || _mem_mmap_zero || _mem_mmap_anon)
1309 #define _done_sbrkmem	1
1310 	Vmuchar_t	*addr;
1311 #if _mem_mmap_zero
1312 	Mmapdisc_t	*mmdc = (Mmapdisc_t*)disc;
1313 #else
1314 	NOTUSED(disc);
1315 #endif
1316 	NOTUSED(vm);
1317 
1318 	if(csize == 0) /* allocating new memory */
1319 	{
1320 
1321 #if _mem_sbrk	/* try using sbrk() and brk() */
1322 		if(!(_Vmassert & VM_mmap))
1323 		{
1324 			addr = (Vmuchar_t*)sbrk(0); /* old break value */
1325 			if(addr && addr != (Vmuchar_t*)BRK_FAILED )
1326 				if(brk(addr+nsize) == 0 )
1327 					return addr;
1328 		}
1329 #endif /* _mem_sbrk */
1330 
1331 #if _mem_mmap_anon /* anonymous mmap */
1332 		{
1333 			addr = (Vmuchar_t*)mmap(0, nsize, PROT_READ|PROT_WRITE,
1334                                         	MAP_ANON|MAP_PRIVATE, -1, 0);
1335 			if(addr && addr != (Vmuchar_t*)MAP_FAILED)
1336 				return addr;
1337 		}
1338 #endif /* _mem_mmap_anon */
1339 
1340 #if _mem_mmap_zero /* mmap from /dev/zero */
1341 		{
1342 			if(mmdc->fd < 0)
1343 			{	int	fd;
1344 				if(mmdc->fd != -1)
1345 					return NIL(Void_t*);
1346 				if((fd = open("/dev/zero", O_RDONLY)) < 0 )
1347 				{	mmdc->fd = -2;
1348 					return NIL(Void_t*);
1349 				}
1350 				if(fd >= OPEN_PRIVATE || (mmdc->fd = dup2(fd,OPEN_PRIVATE)) < 0 )
1351 					mmdc->fd = fd;
1352 				else	close(fd);
1353 #ifdef FD_CLOEXEC
1354 				fcntl(mmdc->fd, F_SETFD, FD_CLOEXEC);
1355 #endif
1356 			}
1357 			addr = (Vmuchar_t*)mmap(0, nsize, PROT_READ|PROT_WRITE,
1358 						MAP_PRIVATE, mmdc->fd, mmdc->offset);
1359 			if(addr && addr != (Vmuchar_t*)MAP_FAILED)
1360 			{	mmdc->offset += nsize;
1361 				return addr;
1362 			}
1363 		}
1364 #endif /* _mem_mmap_zero */
1365 
1366 		return NIL(Void_t*);
1367 	}
1368 	else
1369 	{	addr = caddr; /* in case !_mem_sbrk */
1370 
1371 #if _mem_sbrk
1372 		{
1373 			addr = (Vmuchar_t*)sbrk(0);
1374 			if(!addr || addr == (Vmuchar_t*)BRK_FAILED)
1375 				addr = caddr;
1376 			else if(((Vmuchar_t*)caddr+csize) == addr) /* in sbrk-space */
1377 			{	if(nsize > csize)
1378 					addr += nsize-csize;
1379 				else	addr -= csize-nsize;
1380 				return brk(addr) == 0 ? caddr : NIL(Void_t*);
1381 			}
1382 		}
1383 #endif /* _mem_sbrk */
1384 
1385 #if _mem_mmap_zero || _mem_mmap_anon
1386 		{
1387 			if(((Vmuchar_t*)caddr+csize) > addr) /* in mmap-space */
1388 				if(nsize == 0 && munmap(caddr,csize) == 0)
1389 					return caddr;
1390 		}
1391 #endif /* _mem_mmap_zero || _mem_mmap_anon */
1392 
1393 		return NIL(Void_t*);
1394 	}
1395 #endif /*_done_sbrkmem*/
1396 
1397 #if !_done_sbrkmem /* use native malloc/free as a last resort */
1398 	/**/ASSERT(_std_malloc); /* _std_malloc should be well-defined */
1399 	NOTUSED(vm);
1400 	NOTUSED(disc);
1401 	if(csize == 0)
1402 		return (Void_t*)malloc(nsize);
1403 	else if(nsize == 0)
1404 	{	free(caddr);
1405 		return caddr;
1406 	}
1407 	else	return NIL(Void_t*);
1408 #endif /* _done_sbrkmem */
1409 }
1410 
1411 #if _mem_mmap_zero
1412 static Mmapdisc_t _Vmdcsbrk = { { sbrkmem, NIL(Vmexcept_f), 64*1024 }, -1, 0 };
1413 #else
1414 static Vmdisc_t _Vmdcsbrk = { sbrkmem, NIL(Vmexcept_f), 0 };
1415 #endif
1416 
1417 static Vmethod_t _Vmbest =
1418 {
1419 	bestalloc,
1420 	bestresize,
1421 	bestfree,
1422 	bestaddr,
1423 	bestsize,
1424 	bestcompact,
1425 	bestalign,
1426 	VM_MTBEST
1427 };
1428 
1429 /* The heap region */
1430 static Vmdata_t	_Vmdata =
1431 {
1432 	VM_MTBEST|VM_TRUST,		/* mode		*/
1433 	0,				/* incr		*/
1434 	0,				/* pool		*/
1435 	NIL(Seg_t*),			/* seg		*/
1436 	NIL(Block_t*),			/* free		*/
1437 	NIL(Block_t*),			/* wild		*/
1438 	NIL(Block_t*),			/* root		*/
1439 };
1440 Vmalloc_t _Vmheap =
1441 {
1442 	{ bestalloc,
1443 	  bestresize,
1444 	  bestfree,
1445 	  bestaddr,
1446 	  bestsize,
1447 	  bestcompact,
1448 	  bestalign,
1449 	  VM_MTBEST
1450 	},
1451 	NIL(char*),			/* file		*/
1452 	0,				/* line		*/
1453 	0,				/* func		*/
1454 	(Vmdisc_t*)(&_Vmdcsbrk),	/* disc		*/
1455 	&_Vmdata,			/* data		*/
1456 	NIL(Vmalloc_t*)			/* next		*/
1457 };
1458 
1459 __DEFINE__(Vmalloc_t*, Vmheap, &_Vmheap);
1460 __DEFINE__(Vmalloc_t*, Vmregion, &_Vmheap);
1461 __DEFINE__(Vmethod_t*, Vmbest, &_Vmbest);
1462 __DEFINE__(Vmdisc_t*,  Vmdcsbrk, (Vmdisc_t*)(&_Vmdcsbrk) );
1463 
1464 #ifdef NoF
1465 NoF(vmbest)
1466 #endif
1467 
1468 #endif
1469