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MPI_Type_get_envelope - Returns information about input arguments
associated with a data type.
#include <mpi.h>
int MPI_Type_get_envelope(MPI_Datatype datatype, int *num_integers,
int *num_addresses, int *num_datatypes, int *combiner)
INCLUDE ’mpif.h’
MPI_TYPE_GET_ENVELOPE(DATATYPE, NUM_INTEGERS, NUM_ADDRESSES,
NUM_DATATYPES, COMBINER, IERROR)
INTEGER DATATYPE, NUM_INTEGERS, NUM_ADDRESSES
INTEGER NUM_DATATYPES, COMBINER, IERROR
#include <mpi.h>
void MPI::Datatype::Get_envelope(int& num_integers,
int& num_addresses, int& num_datatypes,
int& combiner) const
- datatype
- Data type to access (handle).
- num_integers
- Number of input integers used in the call constructing combiner (nonnegative
integer).
- num_addresses
- Number of input addresses used in the call constructing
combiner (nonnegative integer).
- num_datatypes
- Number of input data types
used in the call constructing combiner (nonnegative integer).
- combiner
- Combiner
(state).
- IERROR
- Fortran only: Error status (integer).
For the
given data type, MPI_Type_get_envelope returns information on the number
and type of input arguments used in the call that created the data type.
The number-of-arguments values returned can be used to provide sufficiently
large arrays in the decoding routine MPI_Type_get_contents. This call and
the meaning of the returned values is described below. The combiner reflects
the MPI data type constructor call that was used in creating datatype.
These are the values that can be returned in combiner and their associated
calls:
Values Associated Calls
MPI_COMBINER_NAMED a named predefined data type
MPI_COMBINER_DUP MPI_Type_dup
MPI_COMBINER_CONTIGUOUS MPI_Type_contiguous
MPI_COMBINER_VECTOR MPI_Type_vector
MPI_COMBINER_HVECTOR_INTEGER MPI_Type_hvector from Fortran
MPI_COMBINER_HVECTOR MPI_Type_hvector from C or C++
and MPI_Type_create for
all languages
MPI_COMBINER_INDEXED MPI_Type_indexed
MPI_COMBINER_HINDEXED_INTEGER MPI_Type_hindexed from Fortran
MPI_COMBINER_HINDEXED MPI_Type_hindexed from C or C++
and MPI_Type_create_hindexed
for all languages
MPI_COMBINER_INDEXED_BLOCK MPI_Type_create_indexed_block
MPI_COMBINER_STRUCT_INTEGER MPI_Type_struct from Fortran
MPI_COMBINER_STRUCT MPI_Type_struct from C or C++
and MPI_Type_create_struct
for all languages
MPI_COMBINER_SUBARRAY MPI_Type_create_subarray
MPI_COMBINER_DARRAY MPI_Type_create_darray
MPI_COMBINER_F90_REAL MPI_Type_create_f90_real
MPI_COMBINER_F90_COMPLEX MPI_Type_create_f90_complex
MPI_COMBINER_F90_INTEGER MPI_Type_create_f90_integer
MPI_COMBINER_RESIZED MPI_Type_create_resized
If combiner is MPI_COMBINER_NAMED, then datatype is a named predefined
data type.
The actual arguments used in the creation call for a data type
can be obtained from the call MPI_Type_get_contents.
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.
MPI_Type_get_contents
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