MPI_Type_get_envelope − Returns informaion 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 teh 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.