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#ifndef CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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#define CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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//==========================================================================
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//
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//      dlmallocimpl.hxx
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//
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//      Interface to the port of Doug Lea's malloc implementation
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s):    jlarmour
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// Contributors:
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// Date:         2000-06-18
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// Purpose:      Define standard interface to Doug Lea's malloc implementation
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// Description:  Doug Lea's malloc has been ported to eCos. This file provides
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//               the interface between the implementation and the standard
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//               memory allocator interface required by eCos
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// Usage:        #include 
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//
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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// CONFIGURATION
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#include 
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// INCLUDES
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#include                     // size_t, ptrdiff_t
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#include         // types
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#include      // Common memory allocator infra
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// As a special case, override CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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// if the malloc config says so
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#ifdef CYGIMP_MEMALLOC_MALLOC_DLMALLOC
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// forward declaration to prevent header dependency problems
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class Cyg_Mempool_dlmalloc;
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# include 
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# if (CYGMEM_HEAP_COUNT > 1) && \
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     !defined(CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE)
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#  define CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE 1
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# endif
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#endif
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// CONSTANTS
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// number of bins - but changing this alone will not change the number of
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// bins!
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#define CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV 128
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// TYPE DEFINITIONS
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class Cyg_Mempool_dlmalloc_Implementation
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{
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public:
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    /* cyg_dlmalloc_size_t is the word-size used for internal bookkeeping
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       of chunk sizes. On a 64-bit machine, you can reduce malloc
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       overhead, especially for very small chunks, by defining
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       cyg_dlmalloc_size_t to be a 32-bit type at the expense of not
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       being able to handle requests greater than 2^31. This limitation is
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       hardly ever a concern; you are encouraged to set this. However, the
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       default version is the same as size_t. */
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    typedef size_t Cyg_dlmalloc_size_t;
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    typedef struct malloc_chunk
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    {
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        Cyg_dlmalloc_size_t prev_size; /* Size of previous chunk (if free). */
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        Cyg_dlmalloc_size_t size;      /* Size in bytes, including overhead. */
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        struct malloc_chunk* fd;   /* double links -- used only if free. */
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        struct malloc_chunk* bk;
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    };
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protected:
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    /* The first value returned from sbrk */
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    cyg_uint8 *arenabase;
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    /* The total memory in the pool */
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    cyg_int32 arenasize;
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#ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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    struct Cyg_Mempool_dlmalloc_Implementation::malloc_chunk *
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    av_[ CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV * 2 + 2 ];
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#endif
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#ifdef CYGDBG_MEMALLOC_ALLOCATOR_DLMALLOC_DEBUG
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    void
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    do_check_chunk( struct malloc_chunk * );
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    void
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    do_check_free_chunk( struct malloc_chunk * );
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    void
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    do_check_inuse_chunk( struct malloc_chunk * );
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    void
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    do_check_malloced_chunk( struct malloc_chunk *, Cyg_dlmalloc_size_t );
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#endif
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public:
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    // Constructor: gives the base and size of the arena in which memory is
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    // to be carved out, note that management structures are taken from the
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    // same arena.
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    Cyg_Mempool_dlmalloc_Implementation( cyg_uint8 *  /* base */,
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                                         cyg_int32    /* size */,
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                                         CYG_ADDRWORD /* argthru */ );
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    // Destructor
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    ~Cyg_Mempool_dlmalloc_Implementation() {}
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    // get some memory, return NULL if none available
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    cyg_uint8 *
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    try_alloc( cyg_int32 /* size */ );
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    // resize existing allocation, if oldsize is non-NULL, previous
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    // allocation size is placed into it. If previous size not available,
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    // it is set to 0. NB previous allocation size may have been rounded up.
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    // Occasionally the allocation can be adjusted *backwards* as well as,
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    // or instead of forwards, therefore the address of the resized
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    // allocation is returned, or NULL if no resizing was possible.
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    // Note that this differs from ::realloc() in that no attempt is
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    // made to call malloc() if resizing is not possible - that is left
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    // to higher layers. The data is copied from old to new though.
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    // The effects of alloc_ptr==NULL or newsize==0 are undefined
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    cyg_uint8 *
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    resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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                  cyg_int32 * /* oldsize */ );
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    // free the memory back to the pool
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    // returns true on success
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    cyg_bool
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    free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
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    // Get memory pool status
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    // flags is a bitmask of requested fields to fill in. The flags are
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    // defined in common.hxx
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    void
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    get_status( cyg_mempool_status_flag_t /* flags */,
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                Cyg_Mempool_Status & /* status */ );
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};
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#endif // ifndef CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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// EOF dlmallocimpl.hxx

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