/*$Id: ex5.c,v 1.7 2001/04/10 19:34:49 bsmith Exp $*/

static char help[] = "Tests ISLocalToGlobalMappingGetInfo.()\n\n";

#include "petscis.h"

#undef __FUNCT__
#define __FUNCT__ "main"
int main(int argc,char **argv)
{
  int                    ierr,size,nlocal,local[5],rank,nneigh,*neigh,**ineigh,*numneigh;
  ISLocalToGlobalMapping mapping;


  ierr = PetscInitialize(&argc,&argv,(char*)0,help);CHKERRQ(ierr); 
  ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
  if (size != 3) SETERRQ(1,"Must run with three processors");
  ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr);
  if (rank == 0) {
    nlocal = 4; local[0] = 0; local[1] = 3; local[2] = 2; local[3] = 1;
  } else if (rank == 1) {
    nlocal = 4; local[0] = 3; local[1] = 5; local[2] = 4; local[3] = 2;
  } else {
    nlocal = 4; local[0] = 7; local[1] = 6; local[2] = 5; local[3] = 3;
  }
  ierr = ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD,nlocal,local,&mapping);CHKERRQ(ierr);
  ierr = ISLocalToGlobalMappingGetInfo(mapping,&nneigh,&neigh,&numneigh,&ineigh);CHKERRQ(ierr);
  ierr = ISLocalToGlobalMappingRestoreInfo(mapping,&nneigh,&neigh,&numneigh,&ineigh);CHKERRQ(ierr);
  ierr = ISLocalToGlobalMappingDestroy(mapping);CHKERRQ(ierr);
  ierr = PetscFinalize();CHKERRQ(ierr);
  return 0;
}