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// Teuchos: Common Tools Package
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#ifndef TEUCHOS_MPI_REDUCTION_OP_SETTER_HPP
#define TEUCHOS_MPI_REDUCTION_OP_SETTER_HPP
/// \file Teuchos_MpiReductionOpSetter.hpp
/// \brief Implementation detail of Teuchos' MPI wrapper.
///
/// \warning Everything in this file is an implementation detail of
/// Teuchos. Do not use it and do not depend on it.
///
/// This file only contains meaningful content if building with MPI.
#include <Teuchos_ConfigDefs.hpp>
#ifdef HAVE_MPI
#include "Teuchos_ReductionOp.hpp"
#include "mpi.h"
namespace Teuchos {
namespace Details {
/// \brief Base class for an MPI-compatible reduction operator.
///
/// This class exists as an intermediate wrapper between
/// ValueTypeReductionOp and MPI_Op. Its pure virtual method reduce()
/// takes the same arguments as an MPI_Op reduction / scan operator.
///
/// \note This class only exists if building with MPI enabled.
class TEUCHOSCOMM_LIB_DLL_EXPORT MpiReductionOpBase :
virtual public Describable {
public:
virtual void
reduce (void* invec, void* inoutvec,
int* len, MPI_Datatype* datatype) const = 0;
};
/// \brief Subclass of MpiReductionOpBase that implements reduce()
/// using a ValueTypeReductionOp instance.
///
/// \note This class only views the ValueTypeReductionOp instance; it
/// does not own it. The ValueTypeReductionOp must be in scope;
/// otherwise this class' behavior is undefined.
template<typename OrdinalType>
class MpiReductionOp : public MpiReductionOpBase {
public:
MpiReductionOp (const ValueTypeReductionOp<OrdinalType,char>& reductOp)
: reductOp_ (reductOp)
{}
void
reduce (void* invec, void* inoutvec, int* len, MPI_Datatype* datatype) const
{
#ifdef TEUCHOS_DEBUG
TEUCHOS_TEST_FOR_EXCEPT(!len);
TEUCHOS_TEST_FOR_EXCEPT(!datatype);
#endif
// mfh 23 Nov 2014: Ross made the unfortunate decision initially
// to mash everything into MPI_CHAR. This means that we have to
// do a lot of type casting here. Of course, most implementations
// of ValueTypeReductionOp will immediately cast back from char*
// to the actual type of interest.
int sz;
MPI_Type_size (*datatype, &sz);
(void) datatype;
reductOp_.reduce ((*len) * sz, reinterpret_cast<char*> (invec),
reinterpret_cast<char*> (inoutvec));
}
private:
const ValueTypeReductionOp<OrdinalType, char>& reductOp_;
// Not defined and not to be called
MpiReductionOp ();
MpiReductionOp (const MpiReductionOp&);
MpiReductionOp& operator= (const MpiReductionOp&);
};
/// \brief Set the current reduction or scan operation for MpiComm.
/// Get the resulting MPI_Op to pass into MPI functions.
///
/// \return Global singleton MPI_Op to pass into MPI functions.
/// This is valid only before MPI_Finalize has been called.
///
/// \warning This is an implementation detail of Teuchos.
/// Users should never call this function directly.
MPI_Op setMpiReductionOp (const MpiReductionOpBase& reductOp);
} // namespace Details
} // namespace Teuchos
#endif // HAVE_MPI
#endif // TEUCHOS_MPI_REDUCTION_OP_SETTER_HPP
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