/*
 * Copyright (C) by Argonne National Laboratory
 *     See COPYRIGHT in top-level directory
 */

#include "mpi.h"

#include "mpitestconf.h"
#ifdef HAVE_IOSTREAM
// Not all C++ compilers have iostream instead of iostream.h
#include <iostream>
#ifdef HAVE_NAMESPACE_STD
// Those that do often need the std namespace; otherwise, a bare "cout"
// is likely to fail to compile
using namespace std;
#endif
#else
#include <iostream.h>
#endif
#include <stdio.h>
#include "mpitestcxx.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif

static char MTestDescrip[] = "Test freeing keyvals while still attached to \
a communicator, then make sure that the keyval delete and copy code are still \
executed";

/* Copy increments the attribute value */
int copy_fn(const MPI::Comm & oldcomm, int keyval, void *extra_state,
            void *attribute_val_in, void *attribute_val_out, bool & flag)
{
    /* Copy the address of the attribute */
    *(void **) attribute_val_out = attribute_val_in;
    /* Change the value */
    *(int *) attribute_val_in = *(int *) attribute_val_in + 1;
    /* set flag to 1 to tell comm dup to insert this attribute
     * into the new communicator */
    flag = 1;
    return MPI::SUCCESS;
}

/* Delete decrements the attribute value */
int delete_fn(MPI::Comm & comm, int keyval, void *attribute_val, void *extra_state)
{
    *(int *) attribute_val = *(int *) attribute_val - 1;
    return MPI::SUCCESS;
}

int main(int argc, char *argv[])
{
    int errs = 0;
    int attrval;
    int i, key[32], keyval, saveKeyval;
    MPI::Intracomm comm, dupcomm;

    MTest_Init();

    while (MTestGetIntracomm(comm, 1)) {
        if (comm == MPI::COMM_NULL)
            continue;

        keyval = MPI::Comm::Create_keyval(copy_fn, delete_fn, (void *) 0);
        saveKeyval = keyval;    /* in case we need to free explicitly */
        attrval = 1;
        comm.Set_attr(keyval, &attrval);
        /* See MPI-1, 5.7.1.  Freeing the keyval does not remove it if it
         * is in use in an attribute */
        MPI::Comm::Free_keyval(keyval);

        /* We create some dummy keyvals here in case the same keyval
         * is reused */
        for (i = 0; i < 32; i++) {
            key[i] = MPI::Comm::Create_keyval(MPI::Comm::NULL_COPY_FN,
                                              MPI::Comm::NULL_DELETE_FN, (void *) 0);
        }

        dupcomm = comm.Dup();
        /* Check that the attribute was copied */
        if (attrval != 2) {
            errs++;
            cout << "Attribute not incremented when comm dup'ed, attrval = " <<
                attrval << " should be 2 in communicator " << MTestGetIntracommName() << "\n";
        }
        dupcomm.Free();
        if (attrval != 1) {
            errs++;
            cout << "Attribute not decremented when comm dup'ed, attrval = " <<
                attrval << " should be 1 in communicator " << MTestGetIntracommName() << "\n";
        }
        /* Check that the attribute was freed in the dupcomm */

        if (comm != MPI::COMM_WORLD && comm != MPI::COMM_SELF) {
            comm.Free();
            /* Check that the original attribute was freed */
            if (attrval != 0) {
                errs++;
                printf("Attribute not decremented when comm %s freed\n", MTestGetIntracommName());
            }
        } else {
            /* Explicitly delete the attributes from world and self */
            comm.Delete_attr(saveKeyval);
        }
        /* Free those other keyvals */
        for (i = 0; i < 32; i++) {
            MPI::Comm::Free_keyval(key[i]);
        }
    }
    MTest_Finalize(errs);

    /* The attributes on comm self and world were deleted by finalize
     * (see separate test) */

    return 0;

}
