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 remote-tracking branch 'origin/release'

Merge branch 'jolivet/fix-then' into 'release'

Docs: fix wrong occurences of then instead of than

See merge request petsc/petsc!7007

Docs: fix wrong occurences of then instead of than

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-10-25/fix-offdiagonal/release' into 'release'

Fix use of offdiagonal to off-diagonal

See merge request petsc/petsc!6962

Fix use of offdiagonal to off-diagonal

Merge branch 'jacobf/2023-08-09/linter-detect-static-function-candidates' into 'main'

Linter detect possible static functions

See merge request petsc/petsc!6796

Delete unused code

Merge branch 'barry/2023-06-16/pcmpi-simplify-options-database-api' into 'main'

Change the options database API for PCMPI to eliminate the -mpi_ options...

See merge request petsc/petsc!6611

Track levels of nesting of KSP, for example KSPBJACOBI has nesting 1 higher than the calling KSP

Merge branch 'jolivet/fix-Wextra-semi-stmt' into 'main'

Fix -Wextra-semi-stmt

See merge request petsc/petsc!6708

Fix -Wextra-semi-stmt

Merge branch 'barry/2023-05-31/trivial-bddc-clarification' into 'main'

Change use of PetscRealPart() for PetscMalloc to corresponding PetscBLASInt value

See merge request petsc/petsc!6530

Change use of PetscRealPart() for PetscMalloc to corresponding PetscBLASInt value

Merge remote-tracking branch 'origin/release'

Merge branch 'jolivet/fix-typos-portability' into 'release'

Fix typos, portability issues, segmentation fault

See merge request petsc/petsc!6267

Fix some documentation and typos

Merge branch 'jeremy/less-strcpy-strcat' into 'main'

Use Petsc[Strncpy,Strlcat,Memcpy] over Petsc[Strcpy,Strcat]

Closes #1332

See merge request petsc/petsc!6115

Clean up PETSc str ops to use more secure implementations where possible. These include:

- Use PetscStrncpy()/PetscStrlcat()/PetscMemcpy() over PetscStrcpy()/PetscStrcat()
- Use PetscArraycpy() over

Clean up PETSc str ops to use more secure implementations where possible. These include:

- Use PetscStrncpy()/PetscStrlcat()/PetscMemcpy() over PetscStrcpy()/PetscStrcat()
- Use PetscArraycpy() over PetscMemcpy() as appropriate for string buffer copying
- Use built in string from name over hardcoding
- Use sizeof over hardcoded length
- Replace some Strlcat with Strncpy when offset is known

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Merge branch 'jacobf/2023-01-30/cpp20' into 'main'

Add C++20 support to configure

See merge request petsc/petsc!6014

Fix C++20 implicit enum-float conversions

Merge remote-tracking branch 'origin/release'

Merge branch 'jolivet/fix-typos' into 'release'

Fix Typos

See merge request petsc/petsc!6024