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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 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): 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 <cyg/memalloc/mempolt2.hxx>
//
//
//####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 <pkgconf/memalloc.h>
#include <cyg/kernel/ktypes.h>
#include <cyg/infra/cyg_ass.h> // assertion macros
#include <cyg/kernel/thread.hxx>
#include <cyg/memalloc/common.hxx> // Common memory allocator infra
template <class T>
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 <cyg/memalloc/mempolt2.inl>
// -------------------------------------------------------------------------
#endif // ifndef CYGONCE_MEMALLOC_MEMPOLT2_HXX
// EOF mempolt2.hxx
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