channel.cpp

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#include "channel.h"

#include "communicator_mpi.h"
#include "layout.h"

//====================================================================

Channel *Communicator_impl::send_init(int count, int idir, int ipm)
{
  LOG;

  assert(ipm == 1 || ipm == -1);
  assert(Layout::m_ndim <= max_dimension);

  Channel *ch = new Channel(count);
  if (!ch) {
#ifdef DEBUG
    printf("%s: allocate channel failed.\n", __func__);
#endif
    exit(EXIT_FAILURE);
  }

  int dest = (ipm == Forward) ? Layout::m_ipe_up[idir] : Layout::m_ipe_dn[idir];
  int tag  = idir + max_dimension * (((ipm == Forward) ? 0 : 1) + 2 * m_grid_rank);

  int retv = MPI_Send_init((void *)&ch->m_buf[0], sizeof(Channel::element_type) * count, MPI_BYTE, dest, tag, m_comm, &ch->m_request);

  if (retv != MPI_SUCCESS) {
    return (Channel *)0;
  }

  return ch;
}


//====================================================================

Channel *Communicator_impl::recv_init(int count, int idir, int ipm)
{
  LOG;

  assert(ipm == 1 || ipm == -1);
  assert(Layout::m_ndim <= max_dimension);

  Channel *ch = new Channel(count);
  if (!ch) {
#ifdef DEBUG
    printf("%s: allocate channel failed.\n", __func__);
#endif
    exit(EXIT_FAILURE);
  }

  int src = (ipm == Forward) ? Layout::m_ipe_up[idir] : Layout::m_ipe_dn[idir];
  int tag = idir + max_dimension * (((ipm == Forward) ? 1 : 0) + 2 * src);

  int retv = MPI_Recv_init((void *)&ch->m_buf[0], sizeof(Channel::element_type) * count, MPI_BYTE, src, tag, m_comm, &ch->m_request);

  if (retv != MPI_SUCCESS) {
    return (Channel *)0;
  }

  return ch;
}


//====================================================================
// class Channel
Channel::Channel() : m_buf(0)
{
  LOG;
}


Channel::Channel(const int count) : m_buf(count)
{
  LOG;
}


Channel::~Channel()
{
  LOG;
}


//====================================================================
int Channel::start()
{
  LOG;
  return MPI_Start(&m_request);
}


//====================================================================
int Channel::wait()
{
  LOG;
  return MPI_Wait(&m_request, &m_status);
}


//====================================================================
// class ChannelSet
ChannelSet::ChannelSet(int count) : m_array(count), m_nreq(0)
{
  LOG;
}


//====================================================================
int ChannelSet::append(Channel *p)
{
  LOG;

  if (m_nreq >= m_array.size()) {
    return MPI_ERR_BUFFER;
  }
  m_array[m_nreq++] = p->m_request;  //* need grant access to private data of channel class.

  return MPI_SUCCESS;
}


//====================================================================
int ChannelSet::start()
{
  LOG;
  return MPI_Startall(m_nreq, &m_array[0]);
}


//====================================================================
int ChannelSet::wait()
{
  LOG;
  return MPI_Waitall(m_nreq, &m_array[0], (MPI_Status *)0);
}


//====================================================================
//============================================================END=====