66 строки
2.1 KiB
Groff
66 строки
2.1 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_Info_get_nthkey 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Info_get_nthkey\fP \- Returns the \fIn\fPth defined key in \fIinfo\fP.
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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_Info_get_nthkey(MPI_Info \fIinfo\fP, int \fIn\fP, char \fI*key\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_INFO_GET_NTHKEY(\fIINFO, N, KEY, IERROR\fP)
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INTEGER \fIINFO, N, IERROR\fP
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CHARACTER*(*) \fIKEY\fP
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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void MPI::Info::Get_nthkey(int \fIn\fP, char* \fIkey\fP) const
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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info
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Info object (handle).
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.ft R
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.TP 1i
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n
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Key number (integer).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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key
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Key (string).
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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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MPI_Info_get_nthkey returns the \fIn\fPth defined key in \fIinfo\fP. Keys are numbered 0\...\fIN\fP - 1 where \fIN\fP is the value returned by MPI_Info_get_nkeys. All keys between 0 and \fIN\fP - 1 are guaranteed to be defined. The number of a given key does not change as long as \fIinfo\fP is not modified with MPI_Info_set or MPI_Info_delete.
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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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.SH SEE ALSO
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.ft r
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MPI_Info_get
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.br
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MPI_Info_get_nkeys
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.br
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MPI_Info_get_valueln
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.br
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' @(#)MPI_Info_get_nthkey.3 1.19 06/03/09
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