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#if !defined(_PETSCSFTYPES_H)
#define _PETSCSFTYPES_H
/*S
PetscSF - PETSc object for setting up and managing the communication of certain entries of arrays and Vecs between MPI processes.
Level: intermediate
Concepts: star forest
PetscSF uses the concept of star forests to indicate and determine the communication patterns concisely and efficiently.
A star http://en.wikipedia.org/wiki/Star_(graph_theory) forest is simply a collection of trees of height 1. The leave nodes represent
"ghost locations" for the root nodes.
.seealso: PetscSFCreate(), VecScatter, VecScatterCreate()
S*/
typedef struct _p_PetscSF* PetscSF;
/*S
PetscSFNode - specifier of owner and index
Level: beginner
Concepts: indexing, stride, distribution
Sample Usage:
$ PetscSFNode *remote;
$ ierr = PetscMalloc1(nleaves,&remote);CHKERRQ(ierr);
$ for (i=0; i<size; i++) {
$ remote[i].rank = i;
$ remote[i].index = rank;
$ }
Sample Fortran Usage:
$ type(PetscSFNode) remote(6)
$ remote(1)%rank = modulo(rank+size-1,size)
$ remote(1)%index = 1 * stride
.seealso: PetscSFSetGraph()
S*/
typedef struct {
PetscInt rank; /* Rank of owner */
PetscInt index; /* Index of node on rank */
} PetscSFNode;
#endif
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