/usr/include/trilinos/Kokkos_ScratchSpace.hpp is in libtrilinos-kokkos-dev 12.4.2-2.
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// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
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// modification, are permitted provided that the following conditions are
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// documentation and/or other materials provided with the distribution.
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// 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.
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#ifndef KOKKOS_SCRATCHSPACE_HPP
#define KOKKOS_SCRATCHSPACE_HPP
#include <stdio.h>
#include <Kokkos_Core_fwd.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:
//! Tag this class as a memory space
typedef ScratchMemorySpace memory_space ;
typedef ExecSpace execution_space ;
//! This execution space preferred device_type
typedef Kokkos::Device<execution_space,memory_space> device_type;
typedef typename ExecSpace::array_layout array_layout ;
typedef typename ExecSpace::size_type size_type ;
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))) {
m_iter -= align (size); // put it back like it was
#ifdef KOKKOS_HAVE_DEBUG
// mfh 23 Jun 2015: printf call consumes 25 registers
// in a CUDA build, so only print in debug mode. The
// function still returns NULL if not enough memory.
printf ("ScratchMemorySpace<...>::get_shmem: Failed to allocate "
"%ld byte(s); remaining capacity is %ld byte(s)\n", long(size),
long(m_end-m_iter));
#endif // KOKKOS_HAVE_DEBUG
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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