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

#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"

/*
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";
*/

/* Function prototypes to keep compilers happy */
int copy_fn(MPI_Comm oldcomm, int keyval, void *extra_state,
            void *attribute_val_in, void *attribute_val_out, int *flag);
int delete_fn(MPI_Comm comm, int keyval, void *attribute_val, void *extra_state);

/* Copy increments the attribute value */
int copy_fn(MPI_Comm oldcomm, int keyval, void *extra_state,
            void *attribute_val_in, void *attribute_val_out, int *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_Comm comm, dupcomm;
    MTest_Init(&argc, &argv);

    while (MTestGetIntracomm(&comm, 1)) {
        if (comm == MPI_COMM_NULL)
            continue;

        MPI_Comm_create_keyval(copy_fn, delete_fn, &keyval, (void *) 0);
        saveKeyval = keyval;    /* in case we need to free explicitly */
        attrval = 1;
        MPI_Comm_set_attr(comm, keyval, (void *) &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++) {
            MPI_Comm_create_keyval(MPI_NULL_COPY_FN, MPI_NULL_DELETE_FN, &key[i], (void *) 0);
        }

        MPI_Comm_dup(comm, &dupcomm);
        /* Check that the attribute was copied */
        if (attrval != 2) {
            errs++;
            printf("Attribute not incremented when comm dup'ed (%s)\n", MTestGetIntracommName());
        }
        MPI_Comm_free(&dupcomm);
        if (attrval != 1) {
            errs++;
            printf("Attribute not decremented when dupcomm %s freed\n", MTestGetIntracommName());
        }
        /* Check that the attribute was freed in the dupcomm */

        if (comm != MPI_COMM_WORLD && comm != MPI_COMM_SELF) {
            MPI_Comm_free(&comm);
            /* 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 */
            MPI_Comm_delete_attr(comm, 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 MTestReturnValue(errs);
}
