69 строки
2.5 KiB
Plaintext
69 строки
2.5 KiB
Plaintext
.\"Copyright 2007-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Win_start 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Win_start\fP \- Starts an RMA access epoch for \fIwin\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_Win_start(MPI_Group \fIgroup\fP, int assert, MPI_Win \fIwin\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_WIN_START(\fIGROUP, ASSERT, WIN, IERROR\fP)
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INTEGER GROUP, ASSERT, WIN, 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::Win::Start(const MPI::Group& group, int assert) const
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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group
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The group of target processes (handle).
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.TP 1i
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assert
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Program assertion (integer).
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.TP 1i
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win
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Window object (handle).
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.SH OUTPUT PARAMETERS
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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_Win_start is a one-sided MPI communication synchronization call that starts an RMA access epoch for \fIwin\fP. RMA calls issued on \fIwin\fP during this epoch must
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access only windows at processes in \fIgroup\fP. Each process in \fIgroup\fP must issue a matching
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call to MPI_Win_post. MPI_Win_start
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is allowed to block until the corresponding MPI_Win_post calls have been executed, but is not required to.
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.sp
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The \fIassert\fP argument is used to provide assertions on the context of the call that may be used for various optimizations. (See Section 6.4.4 of the MPI-2 Standard.) A value of \fIassert\fP = 0 is always valid. The following assertion value is supported:
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.sp
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.TP 1i
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MPI_MODE_NOCHECK
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When this value is passed in to this call, the library assumes that
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the post call on the target has been called and it is not necessary
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for the library to check to see if such a call has been made.
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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_Win_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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MPI_Win_post
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MPI_Win_complete
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.br
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