# SNESMultiblockGetSubSNES
Gets the `SNES` contexts for all blocks in a `SNESMULTBLOCK` solver. 
## Synopsis
```
#include "petscsnes.h" 
PetscErrorCode SNESMultiblockGetSubSNES(SNES snes, PetscInt *n, SNES *subsnes[])
```
Not Collective but each `SNES` obtained is parallel


## Input Parameter

- ***snes -*** the solver context



## Output Parameters

- ***n       -*** the number of blocks
- ***subsnes -*** the array of `SNES` contexts



## Note
After `SNESMultiblockGetSubSNES()` the array of `SNES`s MUST be freed by the user
(not each `SNES`, just the array that contains them).

You must call `SNESSetUp()` before calling `SNESMultiblockGetSubSNES()`.




## See Also
 `SNESMULTBLOCK`, `SNESMultiblockSetIS()`, `SNESMultiblockSetFields()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/multiblock/multiblock.c.html#SNESMultiblockGetSubSNES">src/snes/impls/multiblock/multiblock.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/multiblock/multiblock.c.html#SNESMultiblockGetSubSNES_Default">SNESMultiblockGetSubSNES_Default in src/snes/impls/multiblock/multiblock.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/snes/impls/multiblock/multiblock.c)


[Index of all SNES routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)