PetscBarrier
Blocks until this routine is executed by all processors owning the object A.
Synopsis
#include "petsc.h"
PetscErrorCode PetscBarrier(PetscObject obj)
Input Parameters
A -PETSc object (Mat, Vec, IS, SNES etc...) Must be caste with a (PetscObject), can use PETSC_NULL (for MPI_COMM_WORLD)
Easy usage: PetscBarrier(PETSC_NULL)
