/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Simple test of generalized requests";

*/

int query_fn(void *extra_state, MPI_Status * status);

int query_fn(void *extra_state, MPI_Status * status)

{

    /* Set a default status */

    status->MPI_SOURCE = MPI_UNDEFINED;

    status->MPI_TAG = MPI_UNDEFINED;

    MPI_Status_set_cancelled(status, 0);

    MPI_Status_set_elements(status, MPI_BYTE, 0);

    return 0;

}

int free_fn(void *extra_state);

int free_fn(void *extra_state)

{

    int *b = (int *) extra_state;

    if (b)

        *b = *b - 1;

    /* The value returned by the free function is the error code

     * returned by the wait/test function */

    return 0;

}

int cancel_fn(void *extra_state, int complete);

int cancel_fn(void *extra_state, int complete)

{

    return 0;

}

/*

 * This is a very simple test of generalized requests.  Normally, the

 * MPI_Grequest_complete function would be called from another routine,

 * often running in a separate thread.  This simple code allows us to

 * check that requests can be created, tested, and waited on in the

 * case where the request is complete before the wait is called.

 *

 * Note that MPI did *not* define a routine that can be called within

 * test or wait to advance the state of a generalized request.

 * Most uses of generalized requests will need to use a separate thread.

 */

int main(int argc, char *argv[])

{

    int errs = 0;

    int counter, flag;

    MPI_Status status;

    MPI_Request request;

    MTest_Init(&argc, &argv);

    MPI_Grequest_start(query_fn, free_fn, cancel_fn, NULL, &request);

    MPI_Test(&request, &flag, &status);

    if (flag) {

        errs++;

        fprintf(stderr, "Generalized request marked as complete\n");

    }

    MPI_Grequest_complete(request);

    MPI_Wait(&request, &status);

    counter = 1;

    MPI_Grequest_start(query_fn, free_fn, cancel_fn, &counter, &request);

    MPI_Grequest_complete(request);

    MPI_Wait(&request, MPI_STATUS_IGNORE);

    if (counter) {

        errs++;

        fprintf(stderr, "Free routine not called, or not called with extra_data");

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}