UOPBstreamWrite.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    Copyright (C) 2022 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
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#include "UOPstream.H"
#include "PstreamGlobals.H"

#include <mpi.h>

// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

bool Foam::UOPBstream::bufferIPCsend()
{
    // Uses double broadcast
    // 1. for the data size
    // 2. for the data itself
    // With this information, can determine and resize receive buffer

    PstreamGlobals::checkCommunicator(comm_, toProcNo_);

    // Same type must be expected in UIPBstream::bufferIPCrecv()
    label bufSize(sendBuf_.size());

    // Broadcast #1 - data size
    if
    (
        !UPstream::broadcast
        (
            reinterpret_cast<char*>(&bufSize),
            sizeof(label),
            comm_,
            toProcNo_  //< is actually rootProcNo
        )
    )
    {
        FatalErrorInFunction
            << "MPI_Bcast failure sending buffer size:" << bufSize << nl
            << Foam::abort(FatalError);
        return false;
    }

    // Broadcast #2 - data content
    // - skip if there is no data to send
    if (bufSize)
    {
        if
        (
            !UPstream::broadcast
            (
                sendBuf_.data(),
                sendBuf_.size(),  // same as bufSize
                comm_,
                toProcNo_  //< is actually rootProcNo
            )
        )
        {
            FatalErrorInFunction
                << "MPI_Bcast failure sending buffer data:" << bufSize << nl
                << Foam::abort(FatalError);
            return false;
        }
    }

    return true;
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

bool Foam::UOPBstream::write
(
    const commsTypes commsType,  /* unused */
    const int rootProcNo,
    const char* buf,
    const std::streamsize bufSize,
    const int tag,  /* unused */
    const label comm
)
{
    if
    (
        !UPstream::broadcast(const_cast<char*>(buf), bufSize, comm, rootProcNo)
    )
    {
        FatalErrorInFunction
            << "MPI_Bcast failure sending buffer data:" << label(bufSize) << nl
            << Foam::abort(FatalError);
        return false;
    }

    return true;
}


// ************************************************************************* //