:orphan:
# PetscSFFetchAndOpEnd
end operation started in matching call to `PetscSFFetchAndOpBegin()` or `PetscSFFetchAndOpWithMemTypeBegin()` to fetch values from roots and update atomically by applying operation using my leaf value
## Synopsis
```
#include "petscsf.h"
PetscErrorCode PetscSFFetchAndOpEnd(PetscSF sf, MPI_Datatype unit, void *rootdata, const void *leafdata, void *leafupdate, MPI_Op op)
```
Collective
## Input Parameters
- ***sf -*** star forest
- ***unit -*** data type
- ***leafdata -*** leaf values to use in reduction
- ***op -*** operation to use for reduction
## Output Parameters
- ***rootdata -*** root values to be updated, input state is seen by first process to perform an update
- ***leafupdate -*** state at each leaf's respective root immediately prior to my atomic update
## See Also
`PetscSF`, `PetscSFComputeDegreeEnd()`, `PetscSFReduceEnd()`, `PetscSFSetGraph()`, `PetscSFFetchAndOpBegin()`, `PetscSFFetchAndOpWithMemTypeBegin()`
## Level
advanced
## Location
src/vec/is/sf/interface/sf.c
## Examples
src/vec/is/sf/tutorials/ex1.c
## Implementations
PetscSFFetchAndOpEnd_Allgatherv in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c
PetscSFFetchAndOpEnd_Neighbor in src/vec/is/sf/impls/basic/neighbor/sfneighbor.c
PetscSFFetchAndOpEnd_Basic in src/vec/is/sf/impls/basic/sfbasic.c
PetscSFFetchAndOpEnd_Window in src/vec/is/sf/impls/window/sfwindow.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/sf/interface/sf.c)
[Index of all PetscSF routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)