Merge remote-tracking branch 'origin/jczhang/feature-mumps-omp'

Use mmap to allocate the shared pthread barrier if available

Support OpenMP needs of mumps

Remove CHKFORTRANNULLOBJECTDEREFERENCE since it is no longer needed with Fortran null equal to C null

Commit-type: feature

Add a Petsc OMP controler

Reference:
Gutierrez, Samuel K., et al. "Accommodating Thread-Level Heterogeneity in Coupled Parallel Applications."
Parallel and Distributed Processing Symposium (IPDPS),

Add a Petsc OMP controler

Reference:
Gutierrez, Samuel K., et al. "Accommodating Thread-Level Heterogeneity in Coupled Parallel Applications."
Parallel and Distributed Processing Symposium (IPDPS), 2017 IEEE International. IEEE, 2017.

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Revise PETSc shared memory communicator keyval interface

Names like Petsc_ShmComm_keyval etc are conforming to existing keyvals like Petsc_InnerComm_keyval

Remove clang static analyser warning about passing NULL variable to strncat()

Commit-type: testing-fix
Reported-by: clang static analyzer

Sys: Fix 'extern' declarations

Merge branch 'barry/update-petscstrncpy'

Merge remote-tracking branch 'origin/dalcinl/logging'

Merge branch 'maint'

PetscInfo: Add missing errorchecking

Fix PetscStrlcat() which did not append NULL terminator if there was not room

Reported-by: Eric Chamberland <Eric.Chamberland@giref.ulaval.ca>

Add error checking for zero string length for Petscstrncpy() to prevent non-null terminated strings from being returned.

Commit-type: feature

Fixed typo in manual page

Commit-type: documentation

Merge branch 'maint'

Fortran: Silence GCC 8 -Wsign-compare warnings in PETSCSTRNCPY

Man pages: add newlines after "Notes:"

This allows for proper formatting from sowing.

On OS X (using gsed, not the default BSD sed), from the PETSc root directory:

find src include -type f \(

Man pages: add newlines after "Notes:"

This allows for proper formatting from sowing.

On OS X (using gsed, not the default BSD sed), from the PETSc root directory:

find src include -type f \( -name "*.c" -or -name "*.h" -or -name "*.cxx" \) | xargs gsed -i 's/Notes\s*:\s*\(\w.*\)/Notes:\n \1/'

This adds a newline and 4 spaces whenever "Notes:" is followed by any "word" character, in any .c, .h, or .cxx file in src/ or include/

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