63 строки
2.1 KiB
Groff
63 строки
2.1 KiB
Groff
.\"Copyright 2007, Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Win_test 3OpenMPI "March 2007" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Win_test\fP \- Attempts to complete an RMA exposure epoch; a nonblocking version of MPI_Win_wait
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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_test(MPI_Win \fIwin\fP, int *\fIflag\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_TEST(\fI WIN, FLAG, IERROR\fP)
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INTEGER \fI WIN, IERROR\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::Win::Test() const
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.SH INPUT PARAMETERS
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.ft R
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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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.TP 1i
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flag
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The returning state of the test for epoch closure.
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.SH DESCRIPTION
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.ft R
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MPI_Win_test is a one-sided MPI communication synchronization call, a
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nonblocking version of MPI_Win_wait. It returns \fIag = true\fP if
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MPI_Win_wait would return, \fIag = false\fP otherwise. The effect of return of MPI_Win_test with \fIflag = true\fP is the same as the effect of a return of MPI_Win_wait. If \fIag = false\fP is returned, then the call has no visible effect.
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.sp
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Invoke MPI_Win_test only where MPI_Win_wait can be invoked. Once
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the call has returned \fIag = true\fP, it must not be invoked anew, until the window is posted anew.
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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_wait
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.br
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