[97] | 1 | .\"Copyright 2006-2008 Sun Microsystems, Inc. |
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| 2 | .\"Copyright (c) 1996 Thinking Machines |
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| 3 | .TH MPI_Get_address 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Get_address\fP \- Gets the address of a location in memory. |
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| 6 | |
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| 7 | .SH SYNTAX |
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| 8 | .ft R |
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| 9 | .SH C Syntax |
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| 10 | .nf |
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| 11 | #include <mpi.h> |
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| 12 | int MPI_Get_address(void *\fIlocation\fP, MPI_Aint *\fIaddress\fP) |
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| 13 | |
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| 14 | .SH Fortran Syntax |
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| 15 | .nf |
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| 16 | INCLUDE 'mpif.h' |
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| 17 | MPI_GET_ADDRESS(\fILOCATION, ADDRESS, IERROR\fP) |
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| 18 | <type> \fILOCATION\fP(*) |
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| 19 | INTEGER \fIADDRESS, IERROR\fP |
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| 20 | |
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| 21 | .SH C++ Syntax |
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| 22 | .nf |
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| 23 | #include <mpi.h> |
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| 24 | MPI::Aint MPI::Get_address(void* \fIlocation\fP) |
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| 25 | |
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| 26 | .SH INPUT PARAMETERS |
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| 27 | .ft R |
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| 28 | .TP 1i |
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| 29 | location |
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| 30 | Location in caller memory (choice). |
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| 31 | |
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| 32 | .SH OUTPUT PARAMETERS |
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| 33 | .ft R |
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| 34 | .TP 1i |
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| 35 | address |
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| 36 | Address of location (integer). |
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| 37 | .TP 1i |
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| 38 | IERROR |
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| 39 | Fortran only: Error status (integer). |
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| 40 | |
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| 41 | .SH DESCRIPTION |
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| 42 | .ft R |
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| 43 | MPI_Get_address returns the byte address of a location in memory. |
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| 44 | .sp |
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| 45 | Example: Using MPI_Get_address for an array. |
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| 46 | .sp |
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| 47 | .nf |
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| 48 | EAL A(100,100) |
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| 49 | .br |
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| 50 | INTEGER I1, I2, DIFF |
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| 51 | .br |
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| 52 | CALL MPI_GET_ADDRESS(A(1,1), I1, IERROR) |
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| 53 | .br |
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| 54 | CALL MPI_GET_ADDRESS(A(10,10), I2, IERROR) |
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| 55 | .br |
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| 56 | DIFF = I2 - I1 |
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| 57 | .br |
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| 58 | ! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are |
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| 59 | .br |
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| 60 | ! implementation dependent. |
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| 61 | .fi |
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| 62 | |
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| 63 | .SH NOTES |
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| 64 | .ft R |
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| 65 | 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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| 66 | |
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| 67 | .SH ERRORS |
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| 68 | 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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| 69 | .sp |
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| 70 | Before the error value is returned, the current MPI error handler is |
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| 71 | 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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| 72 | |
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