2 /* Creator: Bronis R. de Supinski (bronis@llnl.gov) Mon Jan 21 2003 */
3 /* no-error-waitany2.c -- test behavior with MPI_Waitany & MPI_REQUEST_NULL */
12 main (int argc, char **argv)
16 char processor_name[128];
25 MPI_Init (&argc, &argv);
26 MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
27 MPI_Comm_rank (MPI_COMM_WORLD, &rank);
28 MPI_Get_processor_name (processor_name, &namelen);
29 printf ("(%d) is alive on %s\n", rank, processor_name);
32 MPI_Barrier (MPI_COMM_WORLD);
36 printf ("not enough tasks\n");
42 /* first just try MPI_Waitany on explicit MPI_REQUEST_NULL set... */
43 reqs[0] = reqs[1] = reqs[2] = MPI_REQUEST_NULL;
45 MPI_Waitany (3, reqs, &done, &status);
49 MPI_Irecv (buf0, buf_size, MPI_INT, 1, 1, MPI_COMM_WORLD, &reqs[0]);
50 MPI_Irecv (buf1, buf_size, MPI_INT, 1, 2, MPI_COMM_WORLD, &reqs[1]);
51 MPI_Irecv (buf2, buf_size, MPI_INT, 1, 3, MPI_COMM_WORLD, &reqs[2]);
53 for (i = 3; i >= 0; i--) {
54 MPI_Send (&flipbit, 1, MPI_INT, 1, i, MPI_COMM_WORLD);
56 MPI_Waitany (3, reqs, &done, &status);
57 printf ("Done = %d\n", done);
60 assert (done == (i - 1));
69 memset (buf0, 1, buf_size);
71 for (i = 3; i >= 0; i--) {
72 MPI_Recv (&flipbit, 1, MPI_INT, 0, i, MPI_COMM_WORLD, &status);
75 MPI_Send (buf0, buf_size, MPI_INT, 0, i, MPI_COMM_WORLD);
80 MPI_Barrier (MPI_COMM_WORLD);
83 printf ("(%d) Finished normally\n", rank);