76 строки
2.8 KiB
Groff
76 строки
2.8 KiB
Groff
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.\"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_Comm_get_attr 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Comm_get_attr\fP \- Retrieves attribute value by key.
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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_Comm_get_attr(MPI_Comm \fIcomm\fP, int \fIcomm_keyval\fP,
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void *\fIattribute_val\fP, int *\fIflag\fP)
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.SH Fortran Syntax (see FORTRAN 77 NOTES)
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.nf
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INCLUDE 'mpif.h'
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MPI_COMM_GET_ATTR(\fICOMM, COMM_KEYVAL, ATTRIBUTE_VAL, IERROR\fP)
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INTEGER \fICOMM, COMM_KEYVAL, IERROR \fP
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INTEGER(KIND=MPI_ADDRESS_KIND) \fIATTRIBUTE_VAL\fP
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LOGICAL \fIFLAG\fP
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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bool MPI::Comm::Get_attr(int \fIcomm_keyval\fP, void* \fIattribute_val\fP)
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const
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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comm
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Communicator to which the attribute is attached (handle).
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.TP 1i
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comm_keyval
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Key value (integer).
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.SH OUTPUT PARAMETER
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.ft R
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.TP 1i
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attribute_val
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Attribute value, unless f\fIlag\fP = false.
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.TP 1i
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flag
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False if no attribute is associated with the key (logical).
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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_Comm_get_attr retrieves an attribute value by key. The call is erroneous if there is no key with value \fIkeyval\fP. On the other hand, the call is correct if the key value exists, but no attribute is attached on \fIcomm\fP for that key; in that case, the call returns \fIflag\fP = false. In particular, MPI_KEYVAL_INVALID is an erroneous key value.
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.sp
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This function replaces MPI_Attr_get, 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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.SH FORTRAN 77 NOTES
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.ft R
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The MPI standard prescribes portable Fortran syntax for
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the \fIATTRIBUTE_VAL\fP argument only for Fortran 90. FORTRAN 77
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users may use the non-portable syntax
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.sp
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.nf
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INTEGER*MPI_ADDRESS_KIND \fIATTRIBUTE_VAL\fP
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.fi
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.sp
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where MPI_ADDRESS_KIND is a constant defined in mpif.h
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and gives the length of the declared integer in bytes.
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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_Comm_get_attr.3 1.19 06/03/09
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