bionic (3) MPI_Ibarrier.3.gz

NAME

       MPI_Ibarrier -  Notifies the process that it has reached the barrier and returns immediately

SYNOPSIS

       int MPI_Ibarrier(MPI_Comm comm, MPI_Request *request)

INPUT PARAMETERS

       comm   - communicator (handle)

OUTPUT PARAMETERS

       request
              - communication request (handle)

NOTES

       MPI_Ibarrier is a nonblocking version of MPI_barrier. By calling MPI_Ibarrier, a process notifies that it
       has reached the barrier. The call returns immediately, independent of whether other processes have called
       MPI_Ibarrier.   The  usual barrier semantics are enforced at the corresponding completion operation (test
       or wait), which in the intra-communicator case will complete  only  after  all  other  processes  in  the
       communicator have called MPI_Ibarrier. In the intercommunicator case, it will complete when all processes
       in the remote group have called MPI_Ibarrier.

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This means that this routine may be safely used by multiple threads without
       the  need  for  any  user-provided thread locks.  However, the routine is not interrupt safe.  Typically,
       this is due to the use of memory allocation routines such as malloc or other non-MPICH  runtime  routines
       that are themselves not interrupt-safe.

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the
       end of the argument list.  ierr is an integer and has the same meaning as the return value of the routine
       in C.  In Fortran, MPI routines are subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS

       All  MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the
       function and Fortran routines in the last argument.  Before the value is returned, the current MPI  error
       handler  is called.  By default, this error handler aborts the MPI job.  The error handler may be changed
       with   MPI_Comm_set_errhandler   (for   communicators),   MPI_File_set_errhandler   (for   files),    and
       MPI_Win_set_errhandler  (for  RMA windows).  The MPI-1 routine MPI_Errhandler_set may be used but its use
       is deprecated.  The predefined error handler MPI_ERRORS_RETURN may be used to cause error  values  to  be
       returned.   Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI
       implementations will attempt to continue whenever possible.

                                                   11/12/2016                                    MPI_Ibarrier(3)