NAME

       MPI_Type_commit - Commits a data type.

SYNTAX

C Syntax

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

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_TYPE_COMMIT(DATATYPE, IERROR)
            INTEGER   DATATYPE, IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Type_commit(datatype, ierror)
            TYPE(MPI_Datatype), INTENT(INOUT) :: datatype
            INTEGER, OPTIONAL, INTENT(OUT) :: 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.