Kokkos_Threads.hpp

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//   Kokkos: Manycore Performance-Portable Multidimensional Arrays
//              Copyright (2012) Sandia Corporation
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#ifndef KOKKOS_THREADS_HPP
#define KOKKOS_THREADS_HPP

#include <Kokkos_Core_fwd.hpp>

#if defined( KOKKOS_HAVE_PTHREAD )

#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 Impl::ExecutionSpaceTag  kokkos_tag ;

  typedef Threads                  device_type ;
  typedef Threads                  execution_space ;
  typedef Kokkos::HostSpace        memory_space ;
  typedef memory_space::size_type  size_type ;
  typedef Kokkos::LayoutRight      array_layout ;
  typedef Kokkos::Threads          host_mirror_device_type ;

  typedef ScratchMemorySpace< Threads >  scratch_memory_space ;
  /*------------------------------------------------------------------------*/


  static int in_parallel();

  static bool sleep();

  static bool wake();

  static void fence();

  static void finalize();

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

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


  static void initialize( unsigned threads_count = 1 ,
                          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 team_recommended() { return thread_pool_size(2); }
  inline static unsigned team_max()         { return thread_pool_size(1); }

  inline static unsigned max_hardware_threads() { return thread_pool_size(0); }
  KOKKOS_INLINE_FUNCTION static unsigned hardware_thread_id() { return thread_pool_rank(); }

  //----------------------------------------
};

} // namespace Kokkos

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

namespace Kokkos {
namespace Impl {

template<>
struct VerifyExecutionCanAccessMemorySpace
  < Kokkos::Threads::memory_space
  , Kokkos::Threads::scratch_memory_space
  >
{
  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_Threads_Parallel.hpp>

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

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