DragonFly On-Line Manual Pages

Search: Section:  

MPI_Ibarrier(3)                       MPI                      MPI_Ibarrier(3)


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.

                                   11/9/2015                   MPI_Ibarrier(3)

Search: Section: