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MPI_Type_commit - Commits a data type.
#include <mpi.h>
int MPI_Type_commit(MPI_Datatype *datatype)
INCLUDE ’mpif.h’
MPI_TYPE_COMMIT(DATATYPE, IERROR)
INTEGER DATATYPE, IERROR
#include <mpi.h>
void Datatype::Commit()
- datatype
- Data type (handle).
- IERROR
- Fortran
only: Error status (integer).
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.
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.
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