UPstreamTemplates.C

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    Copyright (C) 2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class T>
Foam::List<T> Foam::UPstream::listGatherValues
(
    const T& localValue,
    const label comm
)
{
    if (!is_contiguous<T>::value)
    {
        FatalErrorInFunction
            << "Cannot gather values for non-contiguous types" << endl
            << Foam::abort(FatalError);
    }
 
 
    List<T> allValues;
 
    const label nproc = (UPstream::parRun() ? UPstream::nProcs(comm) : 1);
 
    if (nproc > 1)
    {
        if (UPstream::master(comm))
        {
            allValues.resize(nproc);
        }
 
        UPstream::mpiGather
        (
            reinterpret_cast<const char*>(&localValue),
            sizeof(T),
            allValues.data_bytes(),
            sizeof(T),
            comm
        );
    }
    else
    {
        // non-parallel: return own value
        allValues.resize(1);
        allValues[0] = localValue;
    }
 
    return allValues;
}
 
 
template<class T>
T Foam::UPstream::listScatterValues
(
    const UList<T>& allValues,
    const label comm
)
{
    if (!is_contiguous<T>::value)
    {
        FatalErrorInFunction
            << "Cannot scatter values for non-contiguous types" << endl
            << Foam::abort(FatalError);
    }
 
 
    const label nproc = (UPstream::parRun() ? UPstream::nProcs(comm) : 1);
 
    T localValue;
 
    if (nproc > 1)
    {
        if (UPstream::master(comm) && allValues.size() < nproc)
        {
            FatalErrorInFunction
                << "Attempting to send " << allValues.size()
                << " values to " << nproc << " processors" << endl
                << Foam::abort(FatalError);
        }
 
        UPstream::mpiScatter
        (
            allValues.cdata_bytes(),
            sizeof(T),
            reinterpret_cast<char*>(&localValue),
            sizeof(T),
            comm
        );
    }
    else
    {
        // non-parallel: return local value
 
        if (allValues.empty())   // Extra safety
        {
            localValue = Zero;
        }
        else
        {
            localValue = allValues[0];
        }
     }
 
     return localValue;
}
 
 
// ************************************************************************* //