MPI_Status_set_elements(3) Open MPI MPI_Status_set_elements(3)NAME
MPI_Status_set_elements, MPI_Status_set_elements_x - Modifies opaque
part of status to allow MPI_Get_elements to return count.
SYNTAXC Syntax
#include <mpi.h>
int MPI_Status_set_elements(MPI_Status *status, MPI_Datatype datatype, int count)
int MPI_Status_set_elements_x(MPI_Status *status, MPI_Datatype datatype, MPI_Count count)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_STATUS_SET_ELEMENTS(STATUS, DATATYPE, COUNT, IERROR)
INTEGER STATUS(MPI_STATUS_SIZE), DATATYPE, COUNT, IERROR
MPI_STATUS_SET_ELEMENTS_X(STATUS, DATATYPE, COUNT, IERROR)
INTEGER STATUS(MPI_STATUS_SIZE), DATATYPE
INTEGER(KIND=MPI_COUNT_KIND) COUNT
INTEGER IERROR
C++ Syntax
#include <mpi.h>
void MPI::Status::Set_elements(const MPI::Datatype& datatype, int count)
INPUT/OUTPUT PARAMETER
status Status to associate with count (status).
INPUT PARAMETERS
datatype Data type associated with count (handle).
count Number of elements to associate with status (integer).
OUTPUT PARAMETER
IERROR Fortran only: Error status (integer).
DESCRIPTIONMPI_Status_set_elements modifies the opaque part of status so that a
call to MPI_Get_elements or MPI_Get_elements_x will return count.
MPI_Get_count will return a compatible value.
A subsequent call to MPI_Get_count(status, datatype, count), to
MPI_Get_elements(status, datatype, count), or to MPI_Get_ele‐
ments_x(status, datatype, count) must use a data-type argument that has
the same type signature as the data-type argument that was used in the
call to MPI_Status_set_elements.
NOTES
Users are advised not to reuse the status fields for values other than
those for which they were intended. Doing so may lead to unexpected
results when using the status object. For example, calling MPI_Get_ele‐
ments may cause an error if the value is out of range, or it may be
impossible to detect such an error. The extra_state argument provided
with a generalized request can be used to return information that does
not logically belong in status. Furthermore, modifying the values in a
status set internally by MPI, such as MPI_Recv, may lead to unpre‐
dictable results and is strongly discouraged.
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++ func‐
tions 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.
FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for the COUNT argu‐
ment of MPI_Status_set_elements_x only for Fortran 90. FORTRAN 77 users
may use the non-portable syntax
INTEGER*MPI_COUNT_KIND COUNT
where MPI_COUNT_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.
1.7.4 Feb 04, 2014 MPI_Status_set_elements(3)
