86 строки
2.9 KiB
Groff
86 строки
2.9 KiB
Groff
.\"Copyright 2006, Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Address 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Address\fP \- Gets the address of a location in memory -- use of this routine is deprecated.
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.nf
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#include <mpi.h>
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int MPI_Address(void *\fIlocation\fP, MPI_Aint\fP *address\fP)
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.SH Fortran Syntax
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.nf
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INCLUDE 'mpif.h'
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MPI_ADDRESS(\fILOCATION\fP,\fI ADDRESS\fP,\fI IERROR\fP)
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<type> \fILOCATION\fP (*)
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INTEGER \fIADDRESS\fP,\fI IERROR\fP
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.SH INPUT PARAMETER
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.ft R
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.TP 1i
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location
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Location in caller memory (choice).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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address
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Address of location (integer).
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.ft R
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.TP 1i
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IERROR
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Fortran only: Error status (integer).
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.SH DESCRIPTION
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.ft R
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Note that use of this routine is \fIdeprecated\fP as of MPI-2. Please use MPI_get_address instead.
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.sp
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This deprecated routine is not available in C++.
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.sp
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The address of a location in memory can be found by invoking this function. Returns the (byte) address of location.
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.sp
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Example: Using MPI_Address for an array.
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.sp
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.nf
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REAL A(100,100)
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.br
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INTEGER I1, I2, DIFF
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.br
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CALL MPI_ADDRESS(A(1,1), I1, IERROR)
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.br
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CALL MPI_ADDRESS(A(10,10), I2, IERROR)
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.br
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DIFF = I2 - I1
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.br
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! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are
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.br
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! implementation dependent.
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.fi
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.SH NOTES
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.ft R
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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.
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.sp
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C users may be tempted to avoid using
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MPI_Address and rely on the availability of the address operator &.
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Note, however, that & cast-expression is a pointer, not an address.
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ANSI C does not require that the value of a pointer (or the pointer
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cast to int) be the absolute address of the object pointed at although
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this is commonly the case. Furthermore, referencing may not have a unique
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definition on machines with a segmented address space. The use of
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MPI_Address to "reference" C variables guarantees portability to
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such machines as well.
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.SH ERRORS
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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.
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.sp
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Before the error value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler
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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.
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' @(#)MPI_Address.3 1.21 06/03/09
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