/* sac.h: SEGREGATED ALLOCATION CACHES INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/master/code/sac.h#14 $
 * Copyright (c) 2001-2020 Ravenbrook Limited.  See end of file for license.
 */

#ifndef sac_h
#define sac_h

#include "mpmtypes.h"
#include "mpm.h" /* for PoolArena */


#define sacClassLIMIT ((Count)8)


/* SAC -- the real segregated allocation caches */

#define SACSig ((Sig)0x5195AC99) /* SIGnature SAC */

typedef struct SACStruct *SAC;

typedef struct SACStruct {
  Sig sig;
  Pool pool;
  Count classesCount;  /* number of classes */
  Index middleIndex;   /* index of the middle */
  _mps_sac_s esac_s;   /* variable length, must be last */
} SACStruct;

#define SACOfExternalSAC(esac) PARENT(SACStruct, esac_s, esac)

#define ExternalSACOfSAC(sac) (&((sac)->esac_s))

#define SACArena(sac) PoolArena((sac)->pool)


/* SACClasses -- structure for specifying classes in the cache */
/* .sacc: This structure must match <code/mps.h#sacc>. */

typedef struct mps_sac_classes_s *SACClasses;


extern Res SACCreate(SAC *sac_o, Pool pool, Count classesCount,
                     SACClasses classes);
extern void SACDestroy(SAC sac);
extern Res SACFill(Addr *p_o, SAC sac, Size size);
extern void SACEmpty(SAC sac, Addr p, Size size);
extern void SACFlush(SAC sac);


#endif /* sac_h */


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