MPIBarrier(3OpenMPI) MPIBarrier(3OpenMPI)

NAME
       MMPPIIBBaarrrriieerr - Blocks until all processes have reached this routine.


SSYYNNTTAAXX
CC SSyynnttaaxx
       #include 
       int MPIBarrier(MPIComm comm)


FFoorrttrraann SSyynnttaaxx
       INCLUDE 'mpif.h'
       MPIBARRIER(COMM, IERROR)
            INTEGER   COMM, IERROR


CC++++ SSyynnttaaxx
       #include 
       void MPI::Comm::Barrier() const = 0


IINNPPUUTT PPAARRAAMMEETTEERR
       comm      Communicator (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERR
       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       Blocks  the  caller  until  all  group members have called it; the call
       returns at any process only after all group members  have  entered  the
       call.


WWHHEENN CCOOMMMMUUNNIICCAATTOORR IISS AANN IINNTTEERR-CCOOMMMMUUNNIICCAATTOORR
       When  the  communicator is an inter-communicator, the barrier operation
       is performed across all processes in both groups.  All processes in the
       first group may exit the barrier when all processes in the second group
       have entered the barrier.


EERRRROORRSS
       Almost all MPI routines return an error value; C routines as the  value
       of  the  function  and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default  error  handler  is  set  to
       MPI::ERRORSTHROWEXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI  error  handler  is
       called.  By  default, this error handler aborts the MPI job, except for
       I/O  function  errors.  The  error  handler   may   be   changed   with
       MPICommseterrhandler; the predefined error handler MPIERRORSRETURN
       may be used to cause error values to be returned. Note  that  MPI  does
       not guarantee that an MPI program can continue past an error.


SEE ALSO
       MPIBcast



Open MPI 1.2                    September 2006           MPIBarrier(3OpenMPI)