Merge branch 'barry/2026-01-13/ftn-generation-for-context-functions' into 'main'

Fortran generation of interface definitions for functions that take and return context variables (void *ctx and PetC

Merge branch 'barry/2026-01-13/ftn-generation-for-context-functions' into 'main'

Fortran generation of interface definitions for functions that take and return context variables (void *ctx and PetCtx ctx)

See merge request petsc/petsc!8956

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Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now t

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now the standard for passing in contexts
- PetscCtxRt ctx is the standard for passing out contexts, including context destroy routines based on PetscCtxDestroyFn

Both of these are typedef to void*

Also removed most use of user and userctx for context arguments now consistently named ctx

Improved documentation on PetscCtx and PetscCtxRt and on how to use contexts (including getting them) from Fortran

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Merge branch 'barry/2025-07-30/fix-matshellsetoperationarg' into 'main'

Complete usage of PetscVoidFn and PetscErrorCodeFn and introduce PetscFortranCallbackFn

See merge request petsc/petsc!8615

Change use of void (*)(void) and void (**)(void) in the PETSc API to PetscVoidFn * and PetscVoidFn ** or PetscErrorCodeFn * or PetscErrorCodeFn **

Merge branch 'jolivet/rm-explicit-empty-output_file' into 'main'

Remove 535 empty .out and consolidate the use of output/empty.out

See merge request petsc/petsc!8538

Remove explicitly listed empty files and switch to output/empty.out

Merge branch 'knepley/feature-hamiltonian-ex2-opt' into 'main'

Fix Hamiltonian ex2 for Landau Damping

See merge request petsc/petsc!7937

DMSwarm: Allow multiple fields to define the DM field and multiple cellDM, allow different coordinate fields, and compute moments
- Changed interface for DMSwarmVectorDefineField() and DMSwarmVectorG

DMSwarm: Allow multiple fields to define the DM field and multiple cellDM, allow different coordinate fields, and compute moments
- Changed interface for DMSwarmVectorDefineField() and DMSwarmVectorGetField() to allow multiple fields
- Add DMSwarmReplace_Internal()
- Add coordinate name to Swarm
- Add DMSwarmGetCoordinateField() and DMSwarmSetCoordinateField()
- Add DMSwarmComputeMoments()
- In DMLocatePoints_Plex(), ignore extra coordinates in input vector
- Add CellDMInfo struct
- Add DMSwarmPushCellDM() and DMSwarmPopCellDM()

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Merge branch 'barry/2024-07-01/fix-petscoptionsgetviewer' into 'main'

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

See merge request petsc/petsc!7667

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VI

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VIEWER_XXXX_() routines

Reported-by: James Wright
Thanks-to: Jeremy L Thompson

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Merge branch 'jolivet/clang-format-18' into 'main'

clang-format version 18

See merge request petsc/petsc!6902

checkbadSource: rules for PetscFunctionBegin and derivatives

Merge branch 'knepley/fix-swarm-view' into 'main'

Fix swarm view or Mark

See merge request petsc/petsc!7331

SNES ex15: Set particles from options

Merge branch 'stefanozampini/minsurf-local' into 'main'

Improve support for nonlinear domain decomposition solvers

See merge request petsc/petsc!7084

DMPLEXSNES: support objective functions

Merge branch 'barry/2023-11-21/fix-thread-safety-petscoptionsgetviewer' into 'main'

Fix PetscOptionsGetViewer() so it works in a thread-safe way

See merge request petsc/petsc!7047

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptio

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptionsGetViewer(). In the previous code PetscObjectReference() and
dereference (via PetscViewerDestroy() where called on the viewer by multiple threads after the viewer
was accessed thus corrupting the object.

This branch introduces a PetscOptionsRestoreViewer() that allows not doing the referencing and dereferencing
on persistant viewers, thus removing the specific race condition above.

Other possible solutions include

Use a lock on each PetscObjectReference/Dereference() just in case they are shared. Could be time consuming so one
could mark each object as either threadshared or independent and only do the locks on threadshared objects. This lowers
the cost but would require more extensive changes to PETSc infrastructure. And I do not know if this shared/not shared model
is what we need in the long run, though it might be.

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Merge branch 'jolivet/housekeeping' into 'main'

Double spaces, wrong backticks, or unneeded braces

See merge request petsc/petsc!6110

Double spaces, wrong backticks, or unneeded braces

Merge branch 'danofinn/swarm-example-landau-damping' into 'main'

Swarm: Add swarm ex9 Landau damping + tests (ex6, ex8, snes/ex15)

See merge request petsc/petsc!6026

SNES ex15: Mixed Poisson example