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#ifndef CYGONCE_MEMALLOC_MEMPOLT2_HXX

#define CYGONCE_MEMALLOC_MEMPOLT2_HXX

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

//

//      mempolt2.hxx

//

//      Mempolt2 (Memory pool template) 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.

//

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// 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):    hmt

// Contributors: jlarmour

// Date:         2000-06-12

// Purpose:      Define Mempolt2 class interface

// Description:  The class defined here provides the APIs for thread-safe,

//               kernel-savvy memory managers; make a class with the

//               underlying allocator as the template parameter.

// Usage:        #include 

//

//

//####DESCRIPTIONEND####

//

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

// It is assumed that implementations using this file have already mandated

// that the kernel is present. So we just go ahead and use it

#include 

#include 

#include          // assertion macros

#include 

#include      // Common memory allocator infra

template 

class Cyg_Mempolt2

{

private:

    T pool;                             // underlying memory manager

    Cyg_ThreadQueue queue;              // queue of waiting threads

    class Mempolt2WaitInfo {

    private:

        Mempolt2WaitInfo() {}

    public:

        cyg_int32 size;

        cyg_uint8 *addr;

        Mempolt2WaitInfo( cyg_int32 allocsize )

        { size = allocsize; addr = 0; }

    };

public:

    Cyg_Mempolt2(

        cyg_uint8 *base,

        cyg_int32 size,

        CYG_ADDRWORD arg_thru );        // Constructor

    ~Cyg_Mempolt2();                    // Destructor

    // get some memory; wait if none available; return NULL if failed

    // due to interrupt

    cyg_uint8 *alloc( cyg_int32 size );

#ifdef CYGFUN_KERNEL_THREADS_TIMER

    // get some memory with a timeout; return NULL if failed

    // due to interrupt or timeout

    cyg_uint8 *alloc( cyg_int32 size, cyg_tick_count abs_timeout );

#endif

    // get some memory, return NULL if none available

    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 the memory back to the pool

    // returns true on success

    cyg_bool free( cyg_uint8 *p, 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 );

    CYGDBG_DEFINE_CHECK_THIS

};

#include 

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

#endif // ifndef CYGONCE_MEMALLOC_MEMPOLT2_HXX

// EOF mempolt2.hxx