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MPI_Type_commit(3OpenMPI)                                                          MPI_Type_commit(3OpenMPI)



NAME
       MPI_Type_commit - Commits a data type.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Type_commit(MPI_Datatype *datatype)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_TYPE_COMMIT(DATATYPE, IERROR)
            INTEGER   DATATYPE, IERROR


C++ Syntax
       #include <mpi.h>
       void Datatype::Commit()


INPUT PARAMETER
       datatype  Data type (handle).


OUTPUT PARAMETER
       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       The  commit operation commits the data type. A data type is the formal description of a communication
       buffer, not the content of that buffer. After a data type has been committed, it  can  be  repeatedly
       reused  to communicate the changing content of a buffer or, indeed, the content of different buffers,
       with different starting addresses.

       Example: The following Fortran code fragment gives examples of using MPI_Type_commit.

           INTEGER type1, type2
           CALL MPI_TYPE_CONTIGUOUS(5, MPI_REAL, type1, ierr)
                         ! new type object created
           CALL MPI_TYPE_COMMIT(type1, ierr)
                         ! now type1 can be used for communication

       If the data type specified in datatype is already committed, it is equivalent to a no-op.


ERRORS
       Almost all MPI routines return an error value; C routines as the value of the  function  and  Fortran
       routines  in  the  last argument. C++ functions do not return errors. If the default error handler is
       set to MPI::ERRORS_THROW_EXCEPTIONS, 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
       MPI_Comm_set_errhandler;  the  predefined  error handler MPI_ERRORS_RETURN 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.




Open MPI 1.2                                   September 2006                      MPI_Type_commit(3OpenMPI)