-/* -*- Mode: C; -*- */
-/* Creator: Bronis R. de Supinski (bronis@llnl.gov) Fri Mar 17 2000 */
-/* waitany-deadlock.c -- deadlock involving MPI_Waitany call */
-
-#include <stdio.h>
-#include <assert.h>
-#include "mpi.h"
-
-#define buf_size 128
-
-int
-main (int argc, char **argv)
-{
- int nprocs = -1;
- int rank = -1;
- char processor_name[128];
- int namelen = 128;
- int buf0[buf_size];
- int buf1[buf_size];
- int buf2[buf_size];
- int i, flipbit, done;
- MPI_Status status;
-
- /* init */
- MPI_Init (&argc, &argv);
- MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
- MPI_Comm_rank (MPI_COMM_WORLD, &rank);
- MPI_Get_processor_name (processor_name, &namelen);
- printf ("(%d) is alive on %s\n", rank, processor_name);
- fflush (stdout);
-
- MPI_Barrier (MPI_COMM_WORLD);
-
- if (nprocs < 2)
- {
- printf ("not enough tasks\n");
- }
- else if (rank == 0)
- {
- MPI_Request reqs[3];
-
- MPI_Irecv (buf0, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD, &reqs[0]);
- MPI_Irecv (buf1, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD, &reqs[1]);
- MPI_Irecv (buf2, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD, &reqs[2]);
-
- for (i = 3; i > 0; i--) {
- MPI_Waitany (i, reqs, &done, &status);
-
- assert (done == (i - 1));
-
- /* don't let next one start until after waitany call... */
- MPI_Send (&flipbit, 1, MPI_INT, 1, i, MPI_COMM_WORLD);
- }
- }
- else if (rank == 1)
- {
- memset (buf0, 1, buf_size*sizeof(int));
-
- for (i = 3; i > 0; i--) {
- MPI_Recv (&flipbit, 1, MPI_INT, 0, i, MPI_COMM_WORLD, &status);
-
- MPI_Send (buf0, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD);
- }
- }
-
- MPI_Barrier (MPI_COMM_WORLD);
-
- MPI_Finalize ();
- printf ("(%d) Finished normally\n", rank);
-}
-
-/* EOF */