/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2010 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

#define TARGET 0

/* Test the given operation within a Fence epoch */
#define TEST_FENCE_OP(op_name_, fcn_call_)                              \
    do {                                                                \
        err = fcn_call_                                                 \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Zero-byte op " op_name_, err );    \
            }                                                           \
        }                                                               \
        err = MPI_Win_fence( 0, win );                                  \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Fence after " op_name_, err );     \
            }                                                           \
        }                                                               \
    } while (0)


/* Test the given operation within a passive target epoch */
#define TEST_PT_OP(op_name_, fcn_call_)                                 \
    do {                                                                \
        err = MPI_Win_lock(MPI_LOCK_EXCLUSIVE, TARGET, 0, win);         \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Lock before" op_name_, err );      \
            }                                                           \
        }                                                               \
        err = fcn_call_                                                 \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Zero-byte op " op_name_, err );    \
            }                                                           \
        }                                                               \
        err = MPI_Win_unlock( TARGET, win );                            \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Unlock after " op_name_, err );    \
            }                                                           \
        }                                                               \
    } while (0)


/* Test the given request-based operation within a passive target epoch */
#define TEST_REQ_OP(op_name_, req_, fcn_call_)                          \
    do {                                                                \
        err = MPI_Win_lock(MPI_LOCK_EXCLUSIVE, TARGET, 0, win);         \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Lock before" op_name_, err );      \
            }                                                           \
        }                                                               \
        err = fcn_call_                                                 \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Zero-byte op " op_name_, err );    \
            }                                                           \
        }                                                               \
        err = MPI_Win_unlock( TARGET, win );                            \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Unlock after " op_name_, err );    \
            }                                                           \
        }                                                               \
        err = MPI_Wait( &req_, MPI_STATUS_IGNORE );                     \
        if (err) {                                                      \
            errs++;                                                     \
            if (errs < 10) {                                            \
                MTestPrintErrorMsg( "Wait after " op_name_, err );      \
            }                                                           \
        }                                                               \
    } while (0)

/*
static char MTEST_Descrip[] = "Test handling of zero-byte transfers";
*/

int main( int argc, char *argv[] )
{
    int           errs = 0, err;
    int           rank, size;
    int           *buf, bufsize;
    int           *result;
    int           *rmabuf, rsize, rcount;
    MPI_Comm      comm;
    MPI_Win       win;
    MPI_Request   req;
    MPI_Datatype  derived_dtp;

    MTest_Init( &argc, &argv );

    bufsize = 256 * sizeof(int);
    buf     = (int *)malloc( bufsize );
    if (!buf) {
        fprintf( stderr, "Unable to allocated %d bytes\n", bufsize );
        MPI_Abort( MPI_COMM_WORLD, 1 );
    }
    result  = (int *)malloc( bufsize );
    if (!result) {
        fprintf( stderr, "Unable to allocated %d bytes\n", bufsize );
        MPI_Abort( MPI_COMM_WORLD, 1 );
    }
    rcount   = 16;
    rsize    = rcount * sizeof(int);
    rmabuf   = (int *)malloc( rsize );
    if (!rmabuf) {
        fprintf( stderr, "Unable to allocated %d bytes\n", rsize );
        MPI_Abort( MPI_COMM_WORLD, 1 );
    }

    MPI_Type_contiguous(2, MPI_INT, &derived_dtp);
    MPI_Type_commit(&derived_dtp);

    /* The following loop is used to run through a series of communicators
     * that are subsets of MPI_COMM_WORLD, of size 1 or greater. */
    while (MTestGetIntracommGeneral( &comm, 1, 1 )) {
        int count = 0;

        if (comm == MPI_COMM_NULL) continue;
        /* Determine the sender and receiver */
        MPI_Comm_rank( comm, &rank );
        MPI_Comm_size( comm, &size );

        MPI_Win_create( buf, bufsize, 2*sizeof(int), MPI_INFO_NULL, comm, &win );
        /* To improve reporting of problems about operations, we
           change the error handler to errors return */
        MPI_Win_set_errhandler( win, MPI_ERRORS_RETURN );

        /** TEST OPERATIONS USING ACTIVE TARGET (FENCE) SYNCHRONIZATION **/
        MPI_Win_fence( 0, win );

        TEST_FENCE_OP("Put",
                      MPI_Put( rmabuf, count, MPI_INT, TARGET, 0,
                               count, MPI_INT, win );
                     );

        TEST_FENCE_OP("Get",
                      MPI_Get( rmabuf, count, MPI_INT, TARGET, 0,
                               count, MPI_INT, win );
                     );
        TEST_FENCE_OP("Accumulate",
                      MPI_Accumulate( rmabuf, count, MPI_INT, TARGET,
                                      0, count, MPI_INT, MPI_SUM, win );
                     );
        TEST_FENCE_OP("Accumulate_derived",
                      MPI_Accumulate( rmabuf, count, derived_dtp, TARGET,
                                      0, count, derived_dtp, MPI_SUM, win );
                     );
        TEST_FENCE_OP("Get accumulate",
                      MPI_Get_accumulate( rmabuf, count, MPI_INT, result,
                                          count, MPI_INT, TARGET, 0,
                                          count, MPI_INT, MPI_SUM, win );
                     );
        /* Note: It's not possible to generate a zero-byte FOP or CAS */

        /** TEST OPERATIONS USING PASSIVE TARGET SYNCHRONIZATION **/

        TEST_PT_OP("Put",
                   MPI_Put( rmabuf, count, MPI_INT, TARGET, 0, count,
                            MPI_INT, win );
                   );
        TEST_PT_OP("Get",
                   MPI_Get( rmabuf, count, MPI_INT, TARGET, 0, count,
                            MPI_INT, win );
                   );
        TEST_PT_OP("Accumulate",
                   MPI_Accumulate( rmabuf, count, MPI_INT, TARGET, 0,
                                   count, MPI_INT, MPI_SUM, win );
                   );
        TEST_PT_OP("Accumulate_derived",
                   MPI_Accumulate( rmabuf, count, derived_dtp, TARGET, 0,
                                   count, derived_dtp, MPI_SUM, win );
                   );
        TEST_PT_OP("Get accumulate",
                   MPI_Get_accumulate( rmabuf, count, MPI_INT, result, count,
                                       MPI_INT, TARGET, 0, count,
                                       MPI_INT, MPI_SUM, win );
                   );

        /* Note: It's not possible to generate a zero-byte FOP or CAS */

        /** TEST REQUEST-BASED OPERATIONS (PASSIVE TARGET ONLY) **/

        TEST_REQ_OP("Rput", req,
                    MPI_Rput( rmabuf, count, MPI_INT, TARGET, 0, count,
                              MPI_INT, win, &req );
                   );
        TEST_REQ_OP("Rget", req,
                    MPI_Rget( rmabuf, count, MPI_INT, TARGET, 0, count,
                              MPI_INT, win, &req );
                   );
        TEST_REQ_OP("Raccumulate", req,
                    MPI_Raccumulate( rmabuf, count, MPI_INT, TARGET, 0,
                                     count, MPI_INT, MPI_SUM, win, &req );
                   );
        TEST_REQ_OP("Raccumulate_derived", req,
                    MPI_Raccumulate( rmabuf, count, derived_dtp, TARGET, 0,
                                     count, derived_dtp, MPI_SUM, win, &req );
                   );
        TEST_REQ_OP("Rget_accumulate", req,
                    MPI_Rget_accumulate( rmabuf, count, MPI_INT, result,
                                         count, MPI_INT, TARGET, 0,
                                         count, MPI_INT, MPI_SUM, win, &req );
                   );

        MPI_Win_free( &win );
        MTestFreeComm(&comm);
    }

    MPI_Type_free(&derived_dtp);

    free( result );
    free( buf );
    free( rmabuf );
    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
