2: #include <petsc/private/matimpl.h>

  4: /* Get new PetscMatStashSpace into the existing space */
  7: PetscErrorCode PetscMatStashSpaceGet(PetscInt bs2,PetscInt n,PetscMatStashSpace *space)
  8: {
  9:   PetscMatStashSpace a;
 10:   PetscErrorCode     ierr;

 13:   if (!n) return(0);

 15:   PetscMalloc(sizeof(struct _MatStashSpace),&a);
 16:   PetscMalloc3(n*bs2,&(a->space_head),n,&a->idx,n,&a->idy);

 18:   a->val              = a->space_head;
 19:   a->local_remaining  = n;
 20:   a->local_used       = 0;
 21:   a->total_space_size = 0;
 22:   a->next             = NULL;

 24:   if (*space) {
 25:     (*space)->next      = a;
 26:     a->total_space_size = (*space)->total_space_size;
 27:   }
 28:   a->total_space_size += n;
 29:   *space               = a;
 30:   return(0);
 31: }

 33: /* Copy the values in space into arrays val, idx and idy. Then destroy space */
 36: PetscErrorCode PetscMatStashSpaceContiguous(PetscInt bs2,PetscMatStashSpace *space,PetscScalar *val,PetscInt *idx,PetscInt *idy)
 37: {
 38:   PetscMatStashSpace a;
 39:   PetscErrorCode     ierr;

 42:   while ((*space)) {
 43:     a    = (*space)->next;
 44:     PetscMemcpy(val,(*space)->val,((*space)->local_used*bs2)*sizeof(PetscScalar));
 45:     val += bs2*(*space)->local_used;
 46:     PetscMemcpy(idx,(*space)->idx,((*space)->local_used)*sizeof(PetscInt));
 47:     idx += (*space)->local_used;
 48:     PetscMemcpy(idy,(*space)->idy,((*space)->local_used)*sizeof(PetscInt));
 49:     idy += (*space)->local_used;

 51:      PetscFree3((*space)->space_head,(*space)->idx,(*space)->idy);
 52:      PetscFree(*space);
 53:     *space = a;
 54:   }
 55:   return(0);
 56: }

 60: PetscErrorCode PetscMatStashSpaceDestroy(PetscMatStashSpace *space)
 61: {
 62:   PetscMatStashSpace a;
 63:   PetscErrorCode     ierr;

 66:   while (*space) {
 67:     a      = (*space)->next;
 68:     PetscFree3((*space)->space_head,(*space)->idx,(*space)->idy);
 69:     PetscFree((*space));
 70:     *space = a;
 71:   }
 72:   *space = NULL;
 73:   return(0);
 74: }