/*
 * Copyright (c) 2015      Mellanox Technologies, Inc.
 *                         All rights reserved.
 * Copyright (c) 2016      Intel, Inc. All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */
/*
 * To compile test:
 * mpicc -I$src_dir -I$src_dir/opal/include -I$src_dir/orte/include -I$src_dir/ompi/include -DOMPI_BUILDING=1 pmix.c -o pmix
 * To run test:
 * mpirun -np 2 <any mca params> ./pmix
 * Test should print "Passed" in case of success and print pmix time intervals at process with rank 0.
 * */
#include <stdio.h>
#include <unistd.h>
#include <mpi.h>
#include <time.h>
#include <sys/time.h>

#include "opal/class/opal_list.h"
#include "opal/mca/pmix/pmix.h"
#include "ompi/proc/proc.h"

#define DO_FINALIZE(rc,flag,format,args...) \
    do {                                    \
        if (flag) {                         \
            fprintf(stderr, format, args);  \
        }                                   \
        MPI_Finalize();                     \
        return rc;                          \
    } while(0);

static int my_rank;
static volatile bool waiting = true;

static double get_timestamp(void)
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return ((tv.tv_sec) + (tv.tv_usec) * 1.0e-6);
}

static void evhandler(int status,
                      const opal_process_name_t *source,
                      opal_list_t *info, opal_list_t *results,
                      opal_pmix_notification_complete_fn_t cbfunc,
                      void *cbdata)
{
    fprintf(stderr, "%d: received notification status %d\n", my_rank, status);
    if (NULL != cbfunc) {
        cbfunc(OPAL_ERR_HANDLERS_COMPLETE, NULL, NULL, NULL, cbdata);
    }
    waiting = false;
}

int main(int argc, char* argv[])
{
    int rc;
    int recv_data;
    size_t i, numprocs;
    ompi_proc_t **procs, *thisproc;
    double t0, t1, t2, t3, t4, t5, t6;
    int *ptr;
    struct timespec tp;
    opal_list_t info;
    opal_value_t *kv;

    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);

    /* register an event */
    OBJ_CONSTRUCT(&info, opal_list_t);
    kv = OBJ_NEW(opal_value_t);
    kv->key = strdup(OPAL_PMIX_EVENT_ORDER_PREPEND);
    opal_list_append(&info, &kv->super);
    opal_pmix.register_evhandler(NULL, &info, evhandler, NULL, NULL);

    int data = my_rank;
    t0 = get_timestamp();
    OPAL_MODEX_SEND_VALUE(rc, OPAL_PMIX_GLOBAL, "MY_RANK", &data, OPAL_INT);
    t1 = get_timestamp();
    if (OPAL_SUCCESS != rc) {
        DO_FINALIZE(rc, 1, "[%d] OPAL_MODEX_SEND_STRING failed.\n", my_rank);
    }
    t2 = get_timestamp();
    opal_pmix.commit();
    opal_pmix.fence(NULL, 1);
    t3 = get_timestamp();
    procs = ompi_proc_world ( &numprocs );
    ptr = &recv_data;
    t4 = get_timestamp();
    for ( i = 0; i < numprocs; i++ ) {
        thisproc = procs[i];
        OPAL_MODEX_RECV_VALUE(rc, "MY_RANK", &thisproc->super.proc_name, (void**)&ptr, OPAL_INT);
        /* check return status and received data */
        if (OPAL_SUCCESS != rc || i != recv_data) {
            rc = OPAL_ERROR;
            DO_FINALIZE(rc, 1, "[%d] OPAL_MODEX_RECV_VALUE failed from rank %d.\n", my_rank, i);
        }
    }
    t5 = get_timestamp();

    /* using fence as a barrier */
    opal_pmix.fence(NULL, 0);
    t6 = get_timestamp();

    fprintf(stderr, "[%d] Test passed.\n", my_rank);
    fprintf(stderr, "[%d] \"MODEX_SEND\" %f\n", my_rank, t1-t0);
    fprintf(stderr, "[%d] \"FENCE\" %f\n", my_rank, t3-t2);
    fprintf(stderr, "[%d] \"MODEX_RECV\" %f\n", my_rank, t5-t4);
    fprintf(stderr, "[%d] \"BARRIER\" %f\n", my_rank, t6-t5);
    fprintf(stderr, "[%d] \"TOTAL\" %f\n", my_rank, t6-t0);

    fprintf(stderr, "[%d] Pid %d waiting for notification\n", my_rank, (int)getpid());

    /* now wait for notification of someone failing */
    tp.tv_sec = 0;
    tp.tv_nsec = 100000;
    waiting = true;
    while (waiting) {
        nanosleep(&tp, NULL);
    }
    free(procs);

    DO_FINALIZE(0, 0, 0, 0);
}