67 строки
2.3 KiB
Groff
67 строки
2.3 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_File_set_atomicity 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_File_set_atomicity\fP \- Sets consistency semantics for data-access operations (collective).
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.SH SYNTAX
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.ft R
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.nf
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C Syntax
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#include <mpi.h>
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int MPI_File_set_atomicity(MPI_File \fIfh\fP, int \fIflag\fP)
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Fortran Syntax
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INCLUDE 'mpif.h'
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MPI_FILE_SET_ATOMICITY(\fIFH\fP,\fI FLAG\fP,\fI IERROR\fP)
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INTEGER FH, FLAG, IERROR
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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::File::Set_atomicity(bool \fIflag\fP)
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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fh
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File handle (handle).
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.TP 1i
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flag
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\fBtrue\fP to enable atomic mode, \fBfalse\fP to enable nonatomic mode (boolean).
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.SH OUTPUT PARAMETER
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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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The consistency semantics for data-access operations using the set of
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file handles created by one collective MPI_File_open is set by collectively
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calling MPI_File_set_atomicity. All processes in the group must pass identical values for
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.I fh
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and
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.I flag.
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If
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.I flag
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is
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.I true,
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atomic mode is set; if
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.I flag
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is
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.I false,
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nonatomic mode is set.
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.sp
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The default value on a call to MPI_File_open in Open MPI is \fItrue\fP for jobs running on more than one node, \fIfalse\fP for jobs running on a single SMP. For more information, see the MPI-2 standard.
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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. For MPI I/O function errors, the default error handler is set to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.
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' @(#)MPI_File_set_atomicity.3 1.8 97/08/26
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' @(#)MPI_File_set_atomicity.3 1.31 06/03/09
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