#ifndef CYGONCE_MEMALLOC_MEMFIXED_HXX
#define CYGONCE_MEMALLOC_MEMFIXED_HXX

//==========================================================================
//
//      memfixed.hxx
//
//      Memory pool with fixed block class declarations
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: jlarmour
// Date:         2000-06-12
// Purpose:      Define Memfixed class interface
// Description:  Inline class for constructing a fixed block allocator
// Usage:        #include <cyg/memalloc/memfixed.hxx>
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================

// CONFIGURATION

#include <pkgconf/memalloc.h>
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
# include <pkgconf/system.h>
# ifdef CYGPKG_KERNEL
#  include <pkgconf/kernel.h>
# endif
#endif


// INCLUDES

#include <cyg/infra/cyg_type.h>        // types
#include <cyg/infra/cyg_ass.h>         // assertion macros

#ifdef CYGFUN_KERNEL_THREADS_TIMER
# include <cyg/kernel/ktypes.h>        // cyg_tick_count
#endif

#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
# include <cyg/memalloc/mempolt2.hxx>  // kernel safe mempool template
#endif

#include <cyg/memalloc/mfiximpl.hxx>   // implementation of a fixed mem pool
#include <cyg/memalloc/common.hxx>     // Common memory allocator infra


// TYPE DEFINITIONS

class Cyg_Mempool_Fixed
{
protected:
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
    Cyg_Mempolt2<Cyg_Mempool_Fixed_Implementation> mypool;
#else
    Cyg_Mempool_Fixed_Implementation mypool;
#endif

public:
    // this API makes concrete a class which implements a thread-safe
    // kernel-savvy memory pool which manages fixed size blocks.

    // Constructor: gives the base and size of the arena in which memory is
    // to be carved out, note that management structures are taken from the
    // same arena.  Alloc_unit is the blocksize allocated.
    Cyg_Mempool_Fixed(
        cyg_uint8 *base,
        cyg_int32 size,
        CYG_ADDRWORD alloc_unit );

    // Destructor
    ~Cyg_Mempool_Fixed();

#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
    // get some memory; wait if none available
    cyg_uint8 *alloc();
    
# ifdef CYGFUN_KERNEL_THREADS_TIMER
    // get some memory with a timeout
    cyg_uint8 *alloc( cyg_tick_count delay_timeout );
# endif
#endif

    // get some memory, return NULL if none available
    cyg_uint8 *try_alloc();
    
    // supposedly resize existing allocation. This is defined in the
    // fixed block allocator purely for API consistency. It will return
    // an error (false) for all values, except for the blocksize
    // returns true on success
    cyg_uint8 *
    resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
                  cyg_int32 *oldsize=NULL );

    // free the memory back to the pool
    cyg_bool free( cyg_uint8 *p );

    // 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
};

#endif // ifndef CYGONCE_MEMALLOC_MEMFIXED_HXX
// EOF memfixed.hxx