FakePetscSetup.hpp

/*

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*/

//Note that this name deliberately clashes.  We want to avoid a test being both sequential and parallel.
#ifndef _PETSCSETUPANDFINALIZE_HPP_
#define _PETSCSETUPANDFINALIZE_HPP_

#include <cxxtest/GlobalFixture.h>

#include <cstdlib>
#include <petsc.h>

#include "PetscSetupUtils.hpp"

#include "PetscException.hpp"

class PetscSetup : public CxxTest::GlobalFixture
{
public:

    bool setUpWorld()
    {
        PetscSetupUtils::CommonSetup();

        // Get rank
        PetscInt my_rank;
        MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);

        // Make sure that only one process proceeds into the test itself
        if (my_rank != 0)
        {
            PETSCEXCEPT(PetscFinalize());
            exit(0);
        }

        // Fool PETSc into thinking it was only run on one process.
        // This ensures any barriers etc. don't cause deadlock.
        PETSC_COMM_WORLD = MPI_COMM_SELF;
        PetscSetupUtils::ResetStatusCache();

        return true;
    }

    bool tearDownWorld()
    {
        // Remind PETSc there were originally more processes so MPI is finalized properly.
        PETSC_COMM_WORLD = MPI_COMM_WORLD;
        PetscSetupUtils::CommonFinalize();
        return true;
    }
};

static PetscSetup thisSetup;

#endif //_PETSCSETUPANDFINALIZE_HPP_