Blame doc/notes/rma/fence_get_simple.c
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#include <mpi.h>
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#include <stdio.h>
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int
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main(
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int argc,
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char * argv[])
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{
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int np;
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int my_rank;
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int neighbor_rank;
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MPI_Win win;
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double my_data;
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double neighbor_data;
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MPI_Init(NULL, NULL);
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MPI_Comm_size(MPI_COMM_WORLD, &np);
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MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
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neighbor_rank = (my_rank + 1) % np;
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if (np < 2)
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{
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if ( my_rank == 0)
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{
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printf("\nERROR: fence_get_simple must be at least (2) "
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"processes\n\n");
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}
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MPI_Finalize();
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return 1;
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}
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MPI_Win_create(&my_data, sizeof(double), sizeof(double), MPI_INFO_NULL,
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MPI_COMM_WORLD, &win);
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my_data = 42.0 * my_rank;
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MPI_Win_fence(MPI_MODE_NOPUT | MPI_MODE_NOPRECEDE, win);
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{
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MPI_Get(&neighbor_data, 1, MPI_DOUBLE,
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neighbor_rank, 0, 1, MPI_DOUBLE, win);
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}
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MPI_Win_fence(MPI_MODE_NOSTORE | MPI_MODE_NOSUCCEED, win);
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if (neighbor_data == 42.0 * neighbor_rank)
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{
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printf("%d: data[%d]=%f\n", my_rank, neighbor_rank, neighbor_data);
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}
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else
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{
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printf("%d: ERROR - data[%d]=%f NOT %f\n",
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my_rank, neighbor_rank, neighbor_data, neighbor_rank * 42.0);
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}
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MPI_Win_free(&win);
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MPI_Finalize();
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return 0;
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}
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