PETSc version 3.17.4
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# PetscBarrier

Blocks until this routine is executed by all processors owning the object obj.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode PetscBarrier(PetscObject obj)

### Input Parameters

| obj | - PETSc object (Mat, Vec, IS, SNES etc...) The object be caste with a (PetscObject). NULL can be used to indicate the barrier should be across MPI_COMM_WORLD

### Notes

This routine calls MPI_Barrier with the communicator of the PETSc Object obj

### Fortran Usage

You may pass PETSC_NULL_VEC or any other PETSc null object, such as PETSC_NULL_MAT, to indicate the barrier should be across MPI_COMM_WORLD. You can also pass in any PETSc object, Vec, Mat, etc

### Level

intermediate

### Location

src/sys/utils/pbarrier.c

### Examples

src/vec/vec/tutorials/performance.c.html
src/tao/pde_constrained/tutorials/elliptic.c.html
src/tao/pde_constrained/tutorials/parabolic.c.html
src/tao/pde_constrained/tutorials/hyperbolic.c.html
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