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f8a402fa0f
RingLength now returns Count, not Size. New test case checks that chunks are added and removed from the arena as memory is allocated and freed. Copied from Perforce Change: 188133 ServerID: perforce.ravenbrook.com
156 lines
5 KiB
C
156 lines
5 KiB
C
/* ring.h: RING INTERFACE
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*
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* $Id$
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* Copyright (c) 2001-2014 Ravenbrook Limited. See end of file for license.
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* Portions copyright (C) 2001 Global Graphics Software.
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*/
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#ifndef ring_h
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#define ring_h
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#include "check.h"
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#include "mpmtypes.h"
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/* RingStruct -- double-ended queue structure
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*
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* .ring: The ring structure is used as a field in other structures
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* in order to link them together into "rings". See <code/ring.c>.
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*/
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typedef struct RingStruct *Ring;
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typedef struct RingStruct { /* double-ended queue structure */
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Ring next, prev; /* links to next and prev element */
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} RingStruct;
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#define RingNONE ((Ring)0)
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extern Bool RingCheck(Ring ring);
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extern Bool RingCheckSingle(Ring ring);
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extern Bool RingIsSingle(Ring ring);
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extern Count RingLength(Ring ring);
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/* .ring.init: See <design/ring/#init> */
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extern void (RingInit)(Ring ring);
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#define RingInit(ring) \
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BEGIN \
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Ring _ring = (ring); \
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AVER(_ring != NULL); \
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_ring->next = _ring; \
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_ring->prev = _ring; \
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AVER(RingCheck(_ring)); \
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END
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/* .ring.finish: See <design/ring/#finish> */
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extern void (RingFinish)(Ring ring);
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#define RingFinish(ring) \
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BEGIN \
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Ring _ring = (ring); \
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AVER(RingCheckSingle(_ring)); \
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_ring->next = RingNONE; \
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_ring->prev = RingNONE; \
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END
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/* .ring.append: See <design/ring/#append> */
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extern void (RingAppend)(Ring ring, Ring new);
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#define RingAppend(ring, new) \
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BEGIN \
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Ring _ring = (ring), _new = (new); \
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AVER(RingCheck(_ring)); \
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AVER(RingCheckSingle(_new)); \
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_new->prev = _ring->prev; \
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_new->next = _ring; \
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_ring->prev->next = _new; \
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_ring->prev = _new; \
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END
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/* .ring.insert: */
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extern void (RingInsert)(Ring ring, Ring new);
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#define RingInsert(ring, new) \
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BEGIN \
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Ring _ring = (ring), _new = (new); \
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AVER(RingCheck(_ring)); \
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AVER(RingCheckSingle(_new)); \
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_new->prev = _ring; \
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_new->next = _ring->next; \
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_ring->next->prev = _new; \
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_ring->next = _new; \
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END
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/* .ring.remove: See <design/ring/#remove> */
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extern void (RingRemove)(Ring old);
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#define RingRemove(old) \
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BEGIN \
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Ring _old = (old); \
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AVER(RingCheck(_old)); \
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AVER(!RingIsSingle(_old)); \
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_old->next->prev = _old->prev; \
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_old->prev->next = _old->next; \
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_old->next = _old; \
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_old->prev = _old; \
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END
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/* .ring.next: See <design/ring/#next> */
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extern Ring (RingNext)(Ring ring);
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#define RingNext(ring) ((ring)->next)
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/* .ring.prev: See <design/ring/#prev> */
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extern Ring (RingPrev)(Ring ring);
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#define RingPrev(ring) ((ring)->prev)
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/* .ring.elt: See <design/ring/#elt> */
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#define RING_ELT(type, field, node) \
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PARENT(type ## Struct, field, node)
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/* .ring.for: See <design/ring/#for> */
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#define RING_FOR(node, ring, next) \
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for(node = RingNext(ring), next = RingNext(node); \
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node != (ring); \
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node = (next), next = RingNext(node))
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#endif /* ring_h */
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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