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

//

//      memfixed.cxx

//

//      Memory pool with fixed block class declarations

//

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

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//

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//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

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

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

//

// Author(s):    hmt

// Contributors: jlarmour

// Date:         2000-06-16

// 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>

#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_FIXED_THREADAWARE

// tell it to optimize for the fixed block one-to-one case

# define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC

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

#endif

#include <cyg/memalloc/memfixed.hxx>

#include <cyg/memalloc/mfiximpl.hxx>   // implementation of a fixed mem pool

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

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

// debugging/assert function

#ifdef CYGDBG_USE_ASSERTS

cyg_bool

Cyg_Mempool_Fixed::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_FIXED_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, note that management structures are taken from the

// same arena.  Alloc_unit is the blocksize allocated.

Cyg_Mempool_Fixed::Cyg_Mempool_Fixed(

    cyg_uint8 *base,

    cyg_int32 size,

    CYG_ADDRWORD alloc_unit )

    : mypool( base, size, alloc_unit )

{

}

// Destructor

Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed()

{

}

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

// get some memory; wait if none available

#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE

cyg_uint8 *

Cyg_Mempool_Fixed::alloc()

{

    return mypool.alloc( 0 );

}

# ifdef CYGFUN_KERNEL_THREADS_TIMER

// get some memory with a timeout

cyg_uint8 *

Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout )

{

    return mypool.alloc( 0, delay_timeout );

}

# endif

#endif

// get some memory, return NULL if none available

cyg_uint8 *

Cyg_Mempool_Fixed::try_alloc()

{

    return mypool.try_alloc( 0 );

}

// free the memory back to the pool

cyg_bool

Cyg_Mempool_Fixed::free( cyg_uint8 *p )

{

    return mypool.free( p, 0 );

}

// 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 *

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

                                 cyg_int32 *oldsize )

{

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

}

// Get memory pool status

void

Cyg_Mempool_Fixed::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 memfixed.cxx