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Use MPI interfaces to check MPI env. #12

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38 changes: 32 additions & 6 deletions c++/src/mpicommons.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,10 @@ bool finalized__ = false;
//
void MPICommons::init()
{
if (inited__)
int is_inited;
initialized(&is_inited);

if (is_inited)
{
return;
}
Expand All @@ -34,9 +37,18 @@ void MPICommons::init()

// Make the init call.
MPI_Init( &argc, &argv );
#endif
}

// Set the flag to prevent further calls.
inited__ = true;

// -----------------------------------------------------------------------------
//
void MPICommons::initialized(int* flag)
{
#if RUNMPI == true
MPI_Initialized(flag);
#else
*flag = 1;
#endif
}

Expand All @@ -45,14 +57,28 @@ void MPICommons::init()
//
void MPICommons::finalize()
{
if (finalized__)
int is_finalized;
finalized(&is_finalized);

if (is_finalized)
{
return;
}

#if RUNMPI == true
MPI_Finalize();
finalized__ = true;
MPI_Finalize();
#endif
}


// -----------------------------------------------------------------------------
//
void MPICommons::finalized(int* flag)
{
#if RUNMPI == true
MPI_Finalized(flag);
#else
*flag = 0;
#endif
}

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8 changes: 8 additions & 0 deletions c++/src/mpicommons.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,10 +24,18 @@ struct MPICommons {
*/
static void init();

/*! \brief Wrapps MPI_Initialzed
*/
static void initialized(int* flag);

/*! \brief Wrapps MPI_FINALIZE
*/
static void finalize();

/*! \brief Wrapps MPI_Finalized
*/
static void finalized(int* flag);

/*! \brief Wrapps MPI_COMM_RANK
* \param comm: The communicator to use.
* \return: The rank of this process withing the given communicator.
Expand Down