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

//

//      memvar.cxx

//

//      Memory pool with variable block class declarations

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

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

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// 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     

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//

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    

// for more details.                                                        

//

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// 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   

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// General Public License v2.                                               

//

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// on this file might be covered by the GNU General Public License.         

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// ####ECOSGPLCOPYRIGHTEND####                                              

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):    dsm, jlarmour

// Contributors: 

// Date:         2000-06-12

// Description: 

// Usage:        #include <cyg/memalloc/memvar.hxx>

//              

//

//####DESCRIPTIONEND####

//

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

// CONFIGURATION

#include <pkgconf/memalloc.h>

#include <pkgconf/system.h>

#ifdef CYGPKG_KERNEL

# include <pkgconf/kernel.h>

#endif

// INCLUDES

#include <cyg/infra/cyg_type.h>        // types

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

#include <cyg/infra/cyg_trac.h>        // tracing 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/memvar.hxx>

#include <cyg/memalloc/mvarimpl.hxx>   // implementation of a variable mem pool

#include <cyg/memalloc/common.hxx>     // Common memory allocator infra

// FUNCTIONS

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

// debugging/assert function

#ifdef CYGDBG_USE_ASSERTS

cyg_bool

Cyg_Mempool_Variable::check_this(cyg_assert_class_zeal zeal) const

{

    CYG_REPORT_FUNCTION();

    // check that we have a non-NULL pointer first

    if( this == NULL ) return false;

#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE

    return mypool.check_this( zeal );

#else

    return true;

#endif

}

#endif

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

// Constructor: gives the base and size of the arena in which memory is

// to be carved out

Cyg_Mempool_Variable::Cyg_Mempool_Variable(

    cyg_uint8 *base,

    cyg_int32 size,

    cyg_int32 alignment)

    : mypool( base, size, (CYG_ADDRWORD)alignment )

{

}

// Destructor

Cyg_Mempool_Variable::~Cyg_Mempool_Variable()

{

}

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

// get some memory; wait if none available

#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE

cyg_uint8 *

Cyg_Mempool_Variable::alloc(cyg_int32 size)

{

    return mypool.alloc( size );

}

# ifdef CYGFUN_KERNEL_THREADS_TIMER

// get some memory with a timeout

cyg_uint8 *

Cyg_Mempool_Variable::alloc(cyg_int32 size, cyg_tick_count delay_timeout)

{

    return mypool.alloc( size , delay_timeout );

}

# endif

#endif

// get some memory, return NULL if none available

cyg_uint8 *

Cyg_Mempool_Variable::try_alloc(cyg_int32 size)

{

    return mypool.try_alloc( 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 *

Cyg_Mempool_Variable::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,

                                    cyg_int32 *oldsize )

{

    return mypool.resize_alloc( alloc_ptr, newsize, oldsize );

}

// free the memory back to the pool

cyg_bool

Cyg_Mempool_Variable::free( cyg_uint8 *p, cyg_int32 size )

{

    return mypool.free( p, size );

}

// Get memory pool status

void

Cyg_Mempool_Variable::get_status( cyg_mempool_status_flag_t flags,

                                  Cyg_Mempool_Status &status )

{

    // set to 0 - if there's anything really waiting, it will be set to

    // 1 later

    status.waiting = 0;

    return mypool.get_status( flags, status );

}

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

// End of memvar.cxx