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MPI_Address - Gets the address of a location in memory -- use of
this routine is deprecated.
#include <mpi.h>
int MPI_Address(void *location, MPI_Aint *address)
INCLUDE ’mpif.h’
MPI_ADDRESS(LOCATION, ADDRESS, IERROR)
<type> LOCATION (*)
INTEGER ADDRESS, IERROR
- location
- Location in caller memory (choice).
- address
- Address of location (integer).
- IERROR
- Fortran only: Error status (integer).
Note that use of this routine is deprecated as of MPI-2. Please
use MPI_Get_address instead.
This deprecated routine is not available in
C++.
The address of a location in memory can be found by invoking this function.
Returns the (byte) address of location.
Example: Using MPI_Address for an
array.
REAL A(100,100)
INTEGER I1, I2, DIFF
CALL MPI_ADDRESS(A(1,1), I1, IERROR)
CALL MPI_ADDRESS(A(10,10), I2, IERROR)
DIFF = I2 - I1
! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are
! implementation dependent.
This routine is provided for both Fortran
and C programmers and may be useful when writing portable code. In the current
release, the address returned by this routine will be the same as that
produced by the C & operator.
C users may be tempted to avoid using MPI_Address
and rely on the availability of the address operator &. Note, however, that
& cast-expression is a pointer, not an address. ANSI C does not require that
the value of a pointer (or the pointer cast to int) be the absolute address
of the object pointed at although this is commonly the case. Furthermore,
referencing may not have a unique definition on machines with a segmented
address space. The use of MPI_Address to "reference" C variables guarantees
portability to such machines as well.
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_Get_address
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