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.

2.1.1                                             May 10, 2017                                MPI_Type_commit(3)