text: /* -*- Mode: C; c-basic-offset:4 ; -*- */
  /*
   *
   *  (C) 2009 by Argonne National Laboratory.
   *      See COPYRIGHT in top-level directory.
   */
  #include "mpi.h"
  #include <stdio.h>
  #include <stdlib.h>
  #include "mpitest.h"
  
  /*
  static char MTEST_Descrip[] = "Test survivability from faults with point to point communication";
  */
  
  int main( int argc, char *argv[] )
  {
      int wrank, wsize, rank, size, color;
      int j, tmp;
      MPI_Comm newcomm;
  
      MPI_Init( &argc, &argv );
  
      MPI_Comm_size( MPI_COMM_WORLD, &wsize );
      MPI_Comm_rank( MPI_COMM_WORLD, &wrank );
  
      /* Color is 0 or 1; 1 will be the processes that "fault" */
      color = (wrank > 0) && (wrank <= wsize/2);
      MPI_Comm_split( MPI_COMM_WORLD, color, wrank, &newcomm );
  
      MPI_Barrier( MPI_COMM_WORLD );
      if (color) {
  	/* Simulate a fault on some processes */
  	exit(1);
      }
      
      /* Can we still use newcomm? */
      MPI_Comm_size( newcomm, &size );
      MPI_Comm_rank( newcomm, &rank );
  
      for (j=0; j<rank; j++) {
  	MPI_Recv( &tmp, 1, MPI_INT, j, 0, newcomm, MPI_STATUS_IGNORE );
      }
      for (j=rank+1; j<size; j++) {
  	MPI_Send( &rank, 1, MPI_INT, j, 0, newcomm );
      }
  
      MPI_Comm_free( &newcomm );
      MPI_Finalize();
  
      printf( " No Errors\n" );
  
      return 0;
  }
  