1: #pragma once

  3: #include <petsc/private/pcisimpl.h>

  5: /*
  6:    Private context (data structure) for the NN preconditioner.
  7: */
  8: typedef struct {
  9:   /* First MUST come the following line, for the stuff that is common to FETI and Neumann-Neumann. */
 10:   PC_IS pcis;

 12:   /* Then, everything else. */
 13:   Mat           coarse_mat;
 14:   Vec           coarse_x;
 15:   Vec           coarse_b;
 16:   KSP           ksp_coarse;
 17:   PetscScalar **DZ_IN; /* proc[k].DZ_IN[i][] = bit of vector to be received from processor i by proc. k  */
 18:   PetscScalar   factor_coarse_rhs;
 19: } PC_NN;

 21: PETSC_EXTERN PetscErrorCode PCNNCreateCoarseMatrix(PC);
 22: PETSC_EXTERN PetscErrorCode PCNNApplySchurToChunk(PC pc, PetscInt n, PetscInt *idx, PetscScalar *chunk, PetscScalar *array_N, Vec vec1_B, Vec vec2_B, Vec vec1_D, Vec vec2_D);
 23: PETSC_EXTERN PetscErrorCode PCNNApplyInterfacePreconditioner(PC pc, Vec r, Vec z, PetscScalar *work_N, Vec vec1_B, Vec vec2_B, Vec vec3_B, Vec vec1_D, Vec vec2_D, Vec vec1_N, Vec vec2_N);
 24: PETSC_EXTERN PetscErrorCode PCNNBalancing(PC pc, Vec r, Vec u, Vec z, Vec vec1_B, Vec vec2_B, Vec vec3_B, Vec vec1_D, Vec vec2_D, PetscScalar *work_N);