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/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
* (C) 2016 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mpi.h>
#include "mpitest.h"
#define BUFSIZE 4
/* This program tests nested lock. Process 0 locks the other processes
* one by one, then unlock each of them.*/
int main(int argc, char *argv[])
{
int rank = 0, nprocs = 0, dst = 0;
int winbuf[BUFSIZE];
MPI_Win win = MPI_WIN_NULL;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
memset(winbuf, 0, sizeof(int) * BUFSIZE);
MPI_Win_create(winbuf, sizeof(int) * BUFSIZE, sizeof(int), MPI_INFO_NULL, MPI_COMM_WORLD, &win);
if (rank == 0) {
/* lock each process */
for (dst = 0; dst < nprocs; dst++) {
MPI_Win_lock(MPI_LOCK_SHARED, dst, 0, win);
}
/* unlock each process */
for (dst = nprocs - 1; dst >= 0; dst--) {
MPI_Win_unlock(dst, win);
}
}
MPI_Barrier(MPI_COMM_WORLD);
MPI_Win_free(&win);
MTest_Finalize(0);
return 0;
}
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