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.TH "MPI_GET_ADDRESS" "3" "Jul 22, 2024" "" "Open MPI"
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\fI\%MPI_Get_address\fP — Gets the address of a location in memory.
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>

int MPI_Get_address(const void *location, MPI_Aint *address)
.ft P
.fi
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.SS Fortran Syntax
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.INDENT 3.5
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.nf
.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq

MPI_GET_ADDRESS(LOCATION, ADDRESS, IERROR)
    <type> LOCATION(*)
    INTEGER(KIND=MPI_ADDRESS_KIND) ADDRESS
    INTEGER IERROR
.ft P
.fi
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.SS Fortran 2008 Syntax
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.INDENT 3.5
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.nf
.ft C
USE mpi_f08

MPI_Get_address(location, address, ierror)
    TYPE(*), DIMENSION(..), ASYNCHRONOUS :: location
    INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: address
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
.ft P
.fi
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBlocation\fP : Location in caller memory (choice).
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBaddress\fP : Address of location (integer).
.IP \(bu 2
\fBierror\fP : Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
\fI\%MPI_Get_address\fP returns the byte \fBaddress\fP of a location in
memory.
.sp
Example: Using \fI\%MPI_Get_address\fP for an array.
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.INDENT 3.5
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.nf
.ft C
REAL :: A(100,100)
INTEGER(MPI_ADDRESS_KIND) :: I1, I2, DIFF

CALL MPI_GET_ADDRESS(A(1,1), I1, IERROR)
CALL MPI_GET_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.
.ft P
.fi
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.SH NOTES
.sp
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 \fB&\fP
operator.
.sp
C users may be tempted to avoid using \fI\%MPI_Get_address\fP and rely on the
availability of the address operator \fB&\fP\&. 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 \fI\%MPI_Get_address\fP to “reference” C
variables guarantees portability to such machines as well.
.sp
Current Fortran MPI codes will run unmodified and will port to any
system. However, they may fail if \fBaddresses\fP larger than 2^32 \- 1 are
used in the program. New codes should be written so that they use the
new functions. This provides compatibility with C and avoids errors on
64\-bit architectures. However, such newly written codes may need to be
(slightly) rewritten to port to old Fortran 77 environments that do not
support KIND declarations.
.SH ERRORS
.sp
Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler associated
with the communication object (e.g., communicator, window, file) is called.
If no communication object is associated with the MPI call, then the call is
considered attached to MPI_COMM_SELF and will call the associated MPI error
handler. When MPI_COMM_SELF is not initialized (i.e., before
\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
handler is called for all other MPI functions.
.sp
Open MPI includes three predefined error handlers that can be used:
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\fBMPI_ERRORS_ARE_FATAL\fP
Causes the program to abort all connected MPI processes.
.IP \(bu 2
\fBMPI_ERRORS_ABORT\fP
An error handler that can be invoked on a communicator,
window, file, or session. When called on a communicator, it
acts as if \fI\%MPI_Abort\fP was called on that communicator. If
called on a window or file, acts as if \fI\%MPI_Abort\fP was called
on a communicator containing the group of processes in the
corresponding window or file. If called on a session,
aborts only the local process.
.IP \(bu 2
\fBMPI_ERRORS_RETURN\fP
Returns an error code to the application.
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.sp
MPI applications can also implement their own error handlers by calling:
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.IP \(bu 2
\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
.IP \(bu 2
\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.sp
Note that MPI does not guarantee that an MPI program can continue past
an error.
.sp
See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
.sp
See the Error Handling section of the MPI\-3.1 standard for
more information.
.SH COPYRIGHT
2003-2024, The Open MPI Community
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