2:  #include <petscsys.h>
  3:  #include <petsc/private/viewerimpl.h>

  5: struct _n_PetscViewers {
  6:   MPI_Comm    comm;
  7:   PetscViewer *viewer;
  8:   int         n;
  9: };

 11: /*@C
 12:    PetscViewersDestroy - Destroys a set of PetscViewers created with PetscViewersCreate().

 14:    Collective on PetscViewers

 16:    Input Parameters:
 17: .  v - the PetscViewers to be destroyed.

 19:    Level: intermediate

 21: .seealso: PetscViewerSocketOpen(), PetscViewerASCIIOpen(), PetscViewerCreate(), PetscViewerDrawOpen(), PetscViewersCreate()

 23: @*/
 24: PetscErrorCode  PetscViewersDestroy(PetscViewers *v)
 25: {
 26:   int            i;

 30:   if (!*v) return(0);
 31:   for (i=0; i<(*v)->n; i++) {
 32:     PetscViewerDestroy(&(*v)->viewer[i]);
 33:   }
 34:   PetscFree((*v)->viewer);
 35:   PetscFree(*v);
 36:   return(0);
 37: }

 39: /*@C
 40:    PetscViewersCreate - Creates a container to hold a set of PetscViewers.

 42:    Collective on MPI_Comm

 44:    Input Parameter:
 45: .   comm - the MPI communicator

 47:    Output Parameter:
 48: .  v - the collection of PetscViewers

 50:    Level: intermediate

 52:    Concepts: PetscViewer^array of

 54: .seealso: PetscViewerCreate(), PetscViewersDestroy()

 56: @*/
 57: PetscErrorCode  PetscViewersCreate(MPI_Comm comm,PetscViewers *v)
 58: {

 62:   PetscNew(v);
 63:   (*v)->n    = 64;
 64:   (*v)->comm = comm;

 66:   PetscCalloc1(64,&(*v)->viewer);
 67:   return(0);
 68: }

 70: /*@C
 71:    PetscViewersGetViewer - Gets a PetscViewer from a PetscViewer collection

 73:    Not Collective, but PetscViewer will be collective object on PetscViewers

 75:    Input Parameter:
 76: +   viewers - object created with PetscViewersCreate()
 77: -   n - number of PetscViewer you want

 79:    Output Parameter:
 80: .  viewer - the PetscViewer

 82:    Level: intermediate

 84:    Concepts: PetscViewer^array of

 86: .seealso: PetscViewersCreate(), PetscViewersDestroy()

 88: @*/
 89: PetscErrorCode  PetscViewersGetViewer(PetscViewers viewers,PetscInt n,PetscViewer *viewer)
 90: {

 94:   if (n < 0) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Cannot access using a negative index - %d\n",n);
 95:   if (n >= viewers->n) {
 96:     PetscViewer *v;
 97:     int         newn = n + 64; /* add 64 new ones at a time */

 99:     PetscCalloc1(newn,&v);
100:     PetscMemcpy(v,viewers->viewer,viewers->n*sizeof(PetscViewer));
101:     PetscFree(viewers->viewer);

103:     viewers->viewer = v;
104:   }
105:   if (!viewers->viewer[n]) {
106:     PetscViewerCreate(viewers->comm,&viewers->viewer[n]);
107:   }
108:   *viewer = viewers->viewer[n];
109:   return(0);
110: }