static char help[] = "Tests DMGetGlobalVector() and DMRestoreGlobalVector().\n\n";

/*
Use the options
     -da_grid_x <nx> - number of grid points in x direction, if M < 0
     -da_grid_y <ny> - number of grid points in y direction, if N < 0
     -da_processors_x <MX> number of processors in x directio
     -da_processors_y <MY> number of processors in x direction
*/

#include <petscdm.h>
#include <petscdmda.h>

int main(int argc, char **argv)
{
  PetscInt        M = 10, N = 8;
  PetscBool       flg = PETSC_FALSE;
  DM              da;
  Vec             global1, global2, global3;
  DMBoundaryType  bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE;
  DMDAStencilType stype = DMDA_STENCIL_BOX;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &argv, NULL, help));
  PetscCall(PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL));
  if (flg) stype = DMDA_STENCIL_STAR;

  /* Create distributed array and get vectors */
  PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &da));
  PetscCall(DMSetFromOptions(da));
  PetscCall(DMSetUp(da));
  PetscCall(DMGetGlobalVector(da, &global1));
  PetscCall(DMGetGlobalVector(da, &global2));
  PetscCall(DMRestoreGlobalVector(da, &global1));
  PetscCall(DMRestoreGlobalVector(da, &global2));
  PetscCall(DMGetGlobalVector(da, &global1));
  PetscCall(DMGetGlobalVector(da, &global3));
  PetscCall(DMGetGlobalVector(da, &global2));
  PetscCall(DMRestoreGlobalVector(da, &global1));
  PetscCall(DMRestoreGlobalVector(da, &global3));
  PetscCall(DMRestoreGlobalVector(da, &global2));
  PetscCall(DMGetGlobalVector(da, &global1));
  PetscCall(DMGetGlobalVector(da, &global3));
  PetscCall(DMGetGlobalVector(da, &global2));
  PetscCall(DMRestoreGlobalVector(da, &global1));
  PetscCall(DMRestoreGlobalVector(da, &global3));
  PetscCall(DMRestoreGlobalVector(da, &global2));
  PetscCall(DMDestroy(&da));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
     output_file: output/empty.out

TEST*/
