Kokkos_Threads.hpp

/*
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//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
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#ifndef KOKKOS_THREADS_HPP
#define KOKKOS_THREADS_HPP

#include <Kokkos_Macros.hpp>
#if defined( KOKKOS_ENABLE_THREADS )

#include <Kokkos_Core_fwd.hpp>

#include <cstddef>
#include <iosfwd>
#include <Kokkos_HostSpace.hpp>
#include <Kokkos_ScratchSpace.hpp>
#include <Kokkos_Layout.hpp>
#include <Kokkos_MemoryTraits.hpp>
#include <impl/Kokkos_Tags.hpp>

/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {
class ThreadsExec ;
} // namespace Impl
} // namespace Kokkos

/*--------------------------------------------------------------------------*/

namespace Kokkos {

class Threads {
public:

  typedef Threads                  execution_space ;
  typedef Kokkos::HostSpace        memory_space ;

  typedef Kokkos::Device<execution_space,memory_space> device_type;

  typedef Kokkos::LayoutRight      array_layout ;
  typedef memory_space::size_type  size_type ;

  typedef ScratchMemorySpace< Threads >  scratch_memory_space ;


  /*------------------------------------------------------------------------*/


  static int in_parallel();

  static void print_configuration( std::ostream & , const bool detail = false );

  static void impl_static_fence();

  #ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  static void fence();
  #else
  void fence() const;
  #endif

  static int concurrency();

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  static bool sleep();

  static bool wake();

  static void finalize();

  static void initialize( unsigned threads_count = 0 ,
                          unsigned use_numa_count = 0 ,
                          unsigned use_cores_per_numa = 0 ,
                          bool allow_asynchronous_threadpool = false );

  static int is_initialized();

  static Threads & instance( int = 0 );

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

  static int thread_pool_size( int depth = 0 );
#if defined( KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST )
  static int thread_pool_rank();
#else
  KOKKOS_INLINE_FUNCTION static int thread_pool_rank() { return 0 ; }
#endif

  inline static unsigned max_hardware_threads() { return thread_pool_size(0); }
  KOKKOS_INLINE_FUNCTION static unsigned hardware_thread_id() { return thread_pool_rank(); }
#else
  static void impl_finalize();

  /*------------------------------------------------------------------------*/
  /*------------------------------------------------------------------------*/


  static void impl_initialize( unsigned threads_count = 0 ,
                          unsigned use_numa_count = 0 ,
                          unsigned use_cores_per_numa = 0 ,
                          bool allow_asynchronous_threadpool = false );

  static int impl_is_initialized();

  static Threads & impl_instance( int = 0 );

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

  static int impl_thread_pool_size( int depth = 0 );
#if defined( KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST )
  static int impl_thread_pool_rank();
#else
  KOKKOS_INLINE_FUNCTION static int impl_thread_pool_rank() { return 0 ; }
#endif

  inline static unsigned impl_max_hardware_threads() { return impl_thread_pool_size(0); }
  KOKKOS_INLINE_FUNCTION static unsigned impl_hardware_thread_id() { return impl_thread_pool_rank(); }
#endif

  static const char* name();
  //----------------------------------------
};

} // namespace Kokkos

/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {

template<>
struct MemorySpaceAccess
  < Kokkos::Threads::memory_space
  , Kokkos::Threads::scratch_memory_space
  >
{
  enum { assignable = false };
  enum { accessible = true };
  enum { deepcopy   = false };
};

template<>
struct VerifyExecutionCanAccessMemorySpace
  < Kokkos::Threads::memory_space
  , Kokkos::Threads::scratch_memory_space
  >
{
  enum { value = true };
  inline static void verify( void ) { }
  inline static void verify( const void * ) { }
};

} // namespace Impl
} // namespace Kokkos

/*--------------------------------------------------------------------------*/

#include <Kokkos_ExecPolicy.hpp>
#include <Kokkos_Parallel.hpp>
#include <Threads/Kokkos_ThreadsExec.hpp>
#include <Threads/Kokkos_ThreadsTeam.hpp>
#include <Threads/Kokkos_Threads_Parallel.hpp>

#include <KokkosExp_MDRangePolicy.hpp>

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

#endif /* #if defined( KOKKOS_ENABLE_THREADS ) */
#endif /* #define KOKKOS_THREADS_HPP */