Actual source code: petscsftypes.h
petsc-3.12.4 2020-02-04
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      1: #if !defined(PETSCSFTYPES_H)
      2: #define PETSCSFTYPES_H

      4: /*S
      5:    PetscSF - PETSc object for setting up and managing the communication of certain entries of arrays and Vecs between MPI processes.

      7:    Level: intermediate

      9:        PetscSF uses the concept of star forests to indicate and determine the communication patterns concisely and efficiently.
     10:   A star  https://en.wikipedia.org/wiki/Star_(graph_theory) forest is simply a collection of trees of height 1. The leave nodes represent
     11:   "ghost locations" for the root nodes.

     13: .seealso: PetscSFCreate(), VecScatter, VecScatterCreate()
     14: S*/
     15: typedef struct _p_PetscSF* PetscSF;

     17: /*S
     18:    PetscSFNode - specifier of owner and index

     20:    Level: beginner

     22:   Sample Usage:
     23: $      PetscSFNode    *remote;
     24: $    PetscMalloc1(nleaves,&remote);
     25: $    for (i=0; i<size; i++) {
     26: $      remote[i].rank = i;
     27: $      remote[i].index = rank;
     28: $    }

     30:   Sample Fortran Usage:
     31: $     type(PetscSFNode) remote(6)
     32: $      remote(1)%rank  = modulo(rank+size-1,size)
     33: $      remote(1)%index = 1 * stride

     35: .seealso: PetscSFSetGraph()
     36: S*/
     37: typedef struct {
     38:   PetscInt rank;                /* Rank of owner */
     39:   PetscInt index;               /* Index of node on rank */
     40: } PetscSFNode;

     42: #endif