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Kokkos_ScratchSpace.hpp
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Kokkos_ScratchSpace.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos: Manycore Performance-Portable Multidimensional Arrays
// Copyright (2012) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_SCRATCHSPACE_HPP
#define KOKKOS_SCRATCHSPACE_HPP
#include <stdio.h>
#include <Kokkos_Macros.hpp>
#include <impl/Kokkos_Tags.hpp>
/*--------------------------------------------------------------------------*/
namespace
Kokkos
{
/** \brief Scratch memory space associated with an execution space.
*
*/
template
<
class
ExecSpace
>
class
ScratchMemorySpace
{
public
:
// Alignment of memory chunks returned by 'get'
// must be a power of two
enum
{
ALIGN
=
8
};
private
:
mutable
char
*
m_iter
;
char
*
m_end
;
ScratchMemorySpace
();
ScratchMemorySpace
&
operator
=
(
const
ScratchMemorySpace
&
);
enum
{
MASK
=
ALIGN
-
1
};
// Alignment used by View::shmem_size
public
:
typedef
Impl
::
MemorySpaceTag
kokkos_tag
;
typedef
ScratchMemorySpace
memory_space
;
typedef
ExecSpace
execution_space
;
typedef
typename
ExecSpace
::
array_layout
array_layout
;
template
<
typename
IntType
>
KOKKOS_INLINE_FUNCTION
static
IntType
align
(
const
IntType
&
size
)
{
return
(
size
+
MASK
)
&
~
MASK
;
}
template
<
typename
IntType
>
KOKKOS_INLINE_FUNCTION
void
*
get_shmem
(
const
IntType
&
size
)
const
{
void
*
tmp
=
m_iter
;
if
(
m_end
<
(
m_iter
+=
align
(
size
)
)
)
{
printf
(
"ScratchMemorySpace<...>::get_shmem overflow %ld
\n
"
,
long
(
m_end
-
m_iter
));
tmp
=
0
;
}
return
tmp
;
}
template
<
typename
IntType
>
KOKKOS_INLINE_FUNCTION
ScratchMemorySpace
(
void
*
ptr
,
const
IntType
&
size
)
:
m_iter
(
(
char
*
)
ptr
)
,
m_end
(
m_iter
+
size
)
{}
};
}
// namespace Kokkos
#endif
/* #ifndef KOKKOS_SCRATCHSPACE_HPP */
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
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