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MPI_Type_commit.3.rst

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MPI_Type_commit

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

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