Subversion Repositories openrisc_me

#ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX

#define CYGONCE_MEMALLOC_SEPMETAIMPL_HXX

//==========================================================================

//

//      sepmetaimpl.hxx

//

//      Variable block memory pool with separate metadata class declarations

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    jlarmour

// Contributors:

// Date:         2001-06-28

// Purpose:      Define Sepmetaimpl class interface

// Description:  Inline class for constructing a variable block allocator

//               with separate metadata.

// Usage:        #include 

//

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include 

#include 

#include      // Common memory allocator infra

class Cyg_Mempool_Sepmeta_Implementation {

protected:

    // these constructors are explicitly disallowed

    Cyg_Mempool_Sepmeta_Implementation() {};

//    Cyg_Mempool_Sepmeta_Implementation( Cyg_Mempool_Sepmeta_Implementation &ref )

//    {};

    Cyg_Mempool_Sepmeta_Implementation &

    operator=( Cyg_Mempool_Sepmeta_Implementation &ref )

    { return ref; };

    struct memdq {

        struct memdq *prev, *next;       // prev/next alloced/free block

        struct memdq *memprev, *memnext; // prev/next block in memory

        cyg_uint8 *mem;           // memory address associated with this block

    };

    struct memdq allocedhead;   // list of alloced memory

    struct memdq freehead;      // list of free memory

    struct memdq memhead;       // initial block on free list

    struct memdq memend;        // dummy memdq indicating the end

                                // of memory, as if it were alloced

    struct memdq *freemetahead; // unused memdq's

    cyg_uint8  *obase;

    cyg_int32  osize;

    cyg_uint8  *metabase;

    cyg_int32  metasize;

    cyg_uint8  *bottom;

    cyg_uint8  *top;

    cyg_int32  alignment;

    cyg_int32  freemem;

    // round up addresses according to required alignment of pool

    cyg_uint8 *

    alignup( cyg_uint8 *addr );

    cyg_uint8 *

    aligndown( cyg_uint8 *addr );

    // round up addresses according to required alignment of metadata

    cyg_uint8 *

    alignmetaup( cyg_uint8 *addr );

    cyg_uint8 *

    alignmetadown( cyg_uint8 *addr );

    // return the alloced dq at mem

    struct memdq *

    find_alloced_dq( cyg_uint8 *mem );

    // returns a free dq of at least size, or NULL if none

    struct memdq *

    find_free_dq( cyg_int32 size );

    // returns the free dq following mem

    struct memdq *

    find_free_dq_slot( cyg_uint8 *mem );

    void

    insert_free_block( struct memdq *freedq );

    static void

    copy_data( cyg_uint8 *dst, cyg_uint8 *src, cyg_int32 nbytes );

    void

    check_free_memdq( struct memdq *dq );

    void

    check_alloced_memdq( struct memdq *dq );

public:

    // THIS is the public API of memory pools generally that can have the

    // kernel oriented thread-safe package layer atop.

    struct constructorargs {

        cyg_int32 alignment;

        cyg_uint8 *metabase;

        cyg_uint32 metasize;

        constructorargs(cyg_int32 align, cyg_uint8 *mbase, cyg_uint32 msize)

        {

            alignment = align; metabase = mbase; metasize = msize;

        }

    };

    // Constructor: gives the base and size of the arena in which memory is

    // to be carved out.

    Cyg_Mempool_Sepmeta_Implementation(

        cyg_uint8 *  /* base */,

        cyg_int32    /* size */,

        CYG_ADDRWORD /* constructorargs */ );

    // Destructor

    ~Cyg_Mempool_Sepmeta_Implementation();

    // get size bytes of memory

    cyg_uint8 *

    try_alloc( cyg_int32 /* size */ );

    // resize existing allocation, if oldsize is non-NULL, previous

    // allocation size is placed into it. If previous size not available,

    // it is set to 0. NB previous allocation size may have been rounded up.

    // Occasionally the allocation can be adjusted *backwards* as well as,

    // or instead of forwards, therefore the address of the resized

    // allocation is returned, or NULL if no resizing was possible.

    // Note that this differs from ::realloc() in that no attempt is

    // made to call malloc() if resizing is not possible - that is left

    // to higher layers. The data is copied from old to new though.

    // The effects of alloc_ptr==NULL or newsize==0 are undefined

    cyg_uint8 *

    resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,

                  cyg_int32 * /* oldsize */ );

    // free size bytes of memory back to the pool

    // returns true on success

    cyg_bool

    free( cyg_uint8 * /* ptr */,

          cyg_int32   /* size */ );

    // Get memory pool status

    // flags is a bitmask of requested fields to fill in. The flags are

    // defined in common.hxx

    void

    get_status( cyg_mempool_status_flag_t /* flags */,

                Cyg_Mempool_Status & /* status */ );

};

#include 

// -------------------------------------------------------------------------

#endif // ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX

// EOF sepmetaimpl.hxx