[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_Comm_set_attr 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Comm_set_attr\fP \- Stores attribute value associated with a key. |
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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_Comm_set_attr(MPI_Comm \fIcomm\fP, int \fIcomm_keyval\fP, void *\fIattribute_val\fP) |
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| 13 | |
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| 14 | .SH Fortran Syntax (see FORTRAN 77 NOTES) |
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| 15 | .nf |
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| 16 | INCLUDE 'mpif.h' |
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| 17 | MPI_COMM_SET_ATTR(\fICOMM, COMM_KEYVAL, ATTRIBUTE_VAL, IERROR\fP) |
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| 18 | INTEGER \fICOMM, COMM_KEYVAL, IERROR \fP |
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| 19 | INTEGER(KIND=MPI_ADDRESS_KIND) \fIATTRIBUTE_VAL\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 | void MPI::Comm::Set_attr(int \fIcomm_keyval\fP, const void* \fIattribute_val\fP) const |
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| 25 | |
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| 26 | .SH INPUT/OUTPUT PARAMETER |
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| 27 | .ft R |
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| 28 | .TP 1i |
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| 29 | comm |
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| 30 | Communicator from which attribute will be attached (handle). |
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| 31 | |
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| 32 | .SH INPUT PARAMETERS |
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| 33 | .ft R |
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| 34 | .TP 1i |
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| 35 | comm_keyval |
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| 36 | Key value (integer). |
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| 37 | .TP 1i |
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| 38 | attribute_val |
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| 39 | Attribute value. |
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| 40 | |
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| 41 | .SH OUTPUT PARAMETER |
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| 42 | .ft R |
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| 43 | .TP 1i |
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| 44 | IERROR |
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| 45 | Fortran only: Error status (integer). |
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| 46 | |
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| 47 | .SH DESCRIPTION |
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| 48 | .ft R |
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| 49 | MPI_Comm_set_attr stores the stipulated attribute value \fIattribute_val\fP for subsequent retrieval by MPI_Comm_get_attr. If the value is already present, then the outcome is as if MPI_Comm_delete_attr was first called to delete the previous value (and the callback function delete_fn was executed), and a new value was next stored. The call is erroneous if there is no key with value \fIcomm_keyval\fP; in particular MPI_KEYVAL_INVALID is an erroneous key value. The call will fail if the delete_fn function returned an error code other than MPI_SUCCESS. |
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| 50 | .sp |
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| 51 | This function replaces MPI_Attr_put, the use of which is deprecated. The C binding is identical. The Fortran binding differs in that \fIattribute_val\fP is an address-sized integer. |
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| 52 | |
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| 53 | .SH FORTRAN 77 NOTES |
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| 54 | .ft R |
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| 55 | The MPI standard prescribes portable Fortran syntax for |
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| 56 | the \fIATTRIBUTE_VAL\fP argument only for Fortran 90. Sun FORTRAN 77 |
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| 57 | users may use the non-portable syntax |
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| 58 | .sp |
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| 59 | .nf |
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| 60 | INTEGER*MPI_ADDRESS_KIND \fIATTRIBUTE_VAL\fP |
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| 61 | .fi |
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| 62 | .sp |
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| 63 | where MPI_ADDRESS_KIND is a constant defined in mpif.h |
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| 64 | and gives the length of the declared integer in bytes. |
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| 65 | |
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| 66 | .SH NOTES |
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| 67 | .ft R |
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| 68 | Values of the permanent attributes MPI_TAG_UB, MPI_HOST, |
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| 69 | MPI_IO, and MPI_WTIME_IS_GLOBAL may not be changed. |
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| 70 | .sp |
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| 71 | The type of the attribute value depends on whether C or Fortran is being used. In C, an attribute value is a pointer (void *); in Fortran, it is a single, address-size integer system for which a pointer does not fit in an integer. |
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| 72 | .sp |
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| 73 | If an attribute is already present, the delete function (specified when the corresponding keyval was created) will be called. |
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| 74 | |
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| 75 | .SH ERRORS |
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| 76 | 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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| 77 | .sp |
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| 78 | Before the error value is returned, the current MPI error handler is |
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| 79 | 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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| 80 | |
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