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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [services/] [memalloc/] [common/] [v2_0/] [include/] [mvarimpl.hxx] - Blame information for rev 174

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#ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX
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#define CYGONCE_MEMALLOC_MVARIMPL_HXX
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//==========================================================================
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//
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//      mvarimpl.hxx
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//
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//      Memory pool with variable block class declarations
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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):    dsm, jlarmour
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// Contributors:
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// Date:         2000-06-12
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// Purpose:      Define Mvarimpl class interface
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// Description:  Inline class for constructing a variable block allocator
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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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#include 
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#include 
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#include      // Common memory allocator infra
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class Cyg_Mempool_Variable_Implementation {
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protected:
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    // these constructors are explicitly disallowed
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    Cyg_Mempool_Variable_Implementation() {};
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//    Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref )
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//    {};
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    Cyg_Mempool_Variable_Implementation &
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    operator=( Cyg_Mempool_Variable_Implementation &ref )
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    { return ref; };
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    struct memdq {
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        struct memdq *prev, *next;
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        cyg_int32 size;
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    };
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    struct memdq head;
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    cyg_uint8  *obase;
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    cyg_int32  osize;
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    cyg_uint8  *bottom;
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    cyg_uint8  *top;
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    cyg_int32  alignment;
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    cyg_int32  freemem;
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    // round up size passed to alloc/free to a size that will be used
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    // for allocation
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    cyg_int32
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    roundup(cyg_int32 size);
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    struct memdq *
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    addr2memdq( cyg_uint8 *addr );
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    struct memdq *
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    alloc2memdq( cyg_uint8 *addr );
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    cyg_uint8 *
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    memdq2alloc( struct memdq *dq );
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    void
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    insert_free_block( struct memdq *freedq );
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public:
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    // THIS is the public API of memory pools generally that can have the
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    // kernel oriented thread-safe package layer atop.
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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.
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    Cyg_Mempool_Variable_Implementation(
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        cyg_uint8 *  /* base */,
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        cyg_int32    /* size */,
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        CYG_ADDRWORD /* alignment */ = 8 );
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    // Destructor
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    ~Cyg_Mempool_Variable_Implementation();
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    // get size bytes of memory
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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 size bytes of 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 */,
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          cyg_int32   /* size */ );
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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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#include 
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// -------------------------------------------------------------------------
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#endif // ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX
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// EOF mvarimpl.hxx

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