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/*  poolmfs.h: MANUAL FIXED SMALL UNIT POOL
 *
 *  $Id: //info.ravenbrook.com/project/mps/master/code/poolmfs.h#21 $
 *
 *  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 */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */