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122 lines
4.1 KiB
C
122 lines
4.1 KiB
C
/* sac.h: SEGREGATED ALLOCATION CACHES INTERFACE
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
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*/
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#ifndef sac_h
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#define sac_h
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#include "mpmtypes.h"
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#include "mpm.h" /* for PoolArena */
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#define sacClassLIMIT ((Count)8)
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/* ExternalSAC -- the external face of segregated allocation caches */
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/* .sac: This structure must match <code/mps.h#sac>. */
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typedef struct ExternalSACStruct *ExternalSAC;
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typedef struct SACFreeListBlockStruct {
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Size size;
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Count count;
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Count countMax;
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Addr blocks;
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} SACFreeListBlockStruct;
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typedef SACFreeListBlockStruct *SACFreeListBlock;
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typedef struct ExternalSACStruct {
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size_t middle; /* block size for starting searches */
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Bool trapped; /* trap status */
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/* freelist, variable length */
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SACFreeListBlockStruct freelists[2 * sacClassLIMIT];
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} ExternalSACStruct;
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/* SAC -- the real segregated allocation caches */
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#define SACSig ((Sig)0x5195AC99) /* SIGnature SAC */
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typedef struct SACStruct *SAC;
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typedef struct SACStruct {
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Sig sig;
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Pool pool;
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Count classesCount; /* number of classes */
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Index middleIndex; /* index of the middle */
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ExternalSACStruct esacStruct; /* variable length, must be last */
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} SACStruct;
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#define SACOfExternalSAC(esac) PARENT(SACStruct, esacStruct, esac)
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#define ExternalSACOfSAC(sac) (&((sac)->esacStruct))
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#define SACArena(sac) PoolArena((sac)->pool)
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/* SACClasses -- structure for specifying classes in the cache */
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/* .sacc: This structure must match <code/mps.h#sacc>. */
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typedef struct SACClassesStruct *SACClasses;
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typedef struct SACClassesStruct {
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Size blockSize;
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Count cachedCount;
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unsigned frequency;
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} SACClassesStruct;
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extern Res SACCreate(SAC *sac_o, Pool pool, Count classesCount,
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SACClasses classes);
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extern void SACDestroy(SAC sac);
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extern Res SACFill(Addr *p_o, SAC sac, Size size, Bool hasReservoirPermit);
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extern void SACEmpty(SAC sac, Addr p, Size size);
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extern void SACFlush(SAC sac);
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#endif /* sac_h */
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 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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