74 строки
2.5 KiB
Groff
74 строки
2.5 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_Get_address 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Get_address\fP \- Gets the address of a location in memory.
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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_Get_address(void *\fIlocation\fP, MPI_Aint *\fIaddress\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_GET_ADDRESS(\fILOCATION, ADDRESS, IERROR\fP)
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<type> \fILOCATION\fP(*)
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INTEGER \fIADDRESS, IERROR\fP
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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MPI::Aint MPI::Get_address(void* \fIlocation\fP)
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.SH INPUT PARAMETERS
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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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.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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MPI_Get_address returns the byte address of a location in memory.
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.sp
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Example: Using MPI_Get_address for an array.
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.sp
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.nf
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EAL 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_GET_ADDRESS(A(1,1), I1, IERROR)
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.br
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CALL MPI_GET_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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Current Fortran MPI codes will run unmodified and will port to any system. However, they may fail if addresses 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/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.
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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 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_Get_address.3 1.17 06/03/09
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