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#ifndef CYGONCE_MEMALLOC_MEMVAR_HXX
#define CYGONCE_MEMALLOC_MEMVAR_HXX
//==========================================================================
//
// memvar.hxx
//
// Memory pool with variable block class declarations
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): dsm, jlarmour
// Contributors:
// Date: 2000-06-12
// Purpose: Define Memvar class interface
// Description: Inline class for constructing a variable block allocator
// Usage: #include <cyg/memalloc/memvar.hxx>
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
// CONFIGURATION
#include <pkgconf/memalloc.h>
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
# include <pkgconf/system.h>
# ifdef CYGPKG_KERNEL
# include <pkgconf/kernel.h>
# endif
#endif
// when used as an implementation for malloc, we need the following
// to let the system know the name of the class
#define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_Variable
// if the implementation is all that's required, don't output anything else
#ifndef __MALLOC_IMPL_WANTED
// 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_VARIABLE_THREADAWARE
# include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
#endif
#include <cyg/memalloc/mvarimpl.hxx> // implementation of a variable mem pool
#include <cyg/memalloc/common.hxx> // Common memory allocator infra
// TYPE DEFINITIONS
class Cyg_Mempool_Variable
{
protected:
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
Cyg_Mempolt2<Cyg_Mempool_Variable_Implementation> mypool;
#else
Cyg_Mempool_Variable_Implementation mypool;
#endif
public:
// This API makes concrete a class which implements a thread-safe
// kernel-savvy memory pool which manages variable 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.
Cyg_Mempool_Variable( cyg_uint8 * /* base */, cyg_int32 /* size */,
cyg_int32 /* alignment */=8);
// Destructor
~Cyg_Mempool_Variable();
// get some memory; wait if none available
// if we aren't configured to be thread-aware this is irrelevant
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
cyg_uint8 *
alloc( cyg_int32 /* size */ );
# ifdef CYGFUN_KERNEL_THREADS_TIMER
// get some memory with a timeout
cyg_uint8 *
alloc( cyg_int32 /* size */, cyg_tick_count /* delay_timeout */ );
# endif
#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 */ =NULL );
// free the memory back to the pool
// returns true on success
cyg_bool
free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
// 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 __MALLOC_IMPL_WANTED
#endif // ifndef CYGONCE_MEMALLOC_MEMVAR_HXX
// EOF memvar.hxx
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