/*  poolmfs.h: MANUAL FIXED SMALL UNIT POOL
 *
 *  $Id: //info.ravenbrook.com/project/mps/master/code/poolmfs.h#20 $
 *
 *  Copyright (c) 2001-2020 Ravenbrook Limited.  See end of file for license.
 *
 *  The MFS pool is used to manage small fixed-size chunks of memory.  It
 *  stores control structures in the memory it manages, rather than to one
 *  side.  It therefore achieves better locality for small objects, but
 *  wastes memory for large objects.  It should not be used unless you are
 *  packing a reasonable number of objects into an arena grain.
 *
 *  Create and Init take the following arguments:
 *
 *    Size extendBy
 *
 *  extendBy is the default number of bytes reserved by the pool at a time.
 *  A large size will make allocation cheaper but have a higher resource
 *  overhead.  A typical value might be 65536.  See note 2.
 *
 *    Size unitSize
 *
 *  unitSize is the size in bytes of the objects you with to allocate.  It
 *  must be larger than the minimum unit size returned by GetInfo, and not
 *  larger than extendBy.
 */

#ifndef poolmfs_h
#define poolmfs_h

#include "mpm.h"
#include "mpscmfs.h"

typedef struct MFSStruct *MFS;
typedef MFS MFSPool;
DECLARE_CLASS(Pool, MFSPool, AbstractPool);

#define MFSPool(mfs) (&(mfs)->poolStruct)

extern PoolClass PoolClassMFS(void);

extern Bool MFSCheck(MFS mfs);

extern const struct mps_key_s _mps_key_MFSExtendSelf;
#define MFSExtendSelf (&_mps_key_MFSExtendSelf)
#define MFSExtendSelf_FIELD b

extern void MFSExtend(Pool pool, Addr base, Addr limit);

typedef void MFSExtentVisitor(Pool pool, Addr base, Size size,
                              void *closure);
extern void MFSFinishExtents(Pool pool, MFSExtentVisitor visitor,
                             void *closure);

#endif /* poolmfs_h */


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 *
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 *
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 *
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