[97] | 1 | .\"Copyright 2007-2008 Sun Microsystems, Inc. |
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| 2 | .\" Copyright (c) 1996 Thinking Machines Corporation |
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| 3 | .TH MPI_Win_start 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Win_start\fP \- Starts an RMA access epoch for \fIwin\fP |
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| 6 | |
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| 7 | .SH SYNTAX |
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| 8 | .ft R |
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| 9 | .SH C Syntax |
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| 10 | .nf |
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| 11 | #include <mpi.h> |
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| 12 | int MPI_Win_start(MPI_Group \fIgroup\fP, int assert, MPI_Win \fIwin\fP) |
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| 13 | |
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| 14 | .SH Fortran Syntax |
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| 15 | .nf |
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| 16 | INCLUDE 'mpif.h' |
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| 17 | MPI_WIN_START(\fIGROUP, ASSERT, WIN, IERROR\fP) |
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| 18 | INTEGER GROUP, ASSERT, WIN, IERROR |
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| 19 | |
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| 20 | .SH C++ Syntax |
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| 21 | .nf |
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| 22 | #include <mpi.h> |
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| 23 | void MPI::Win::Start(const MPI::Group& group, int assert) const |
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| 24 | |
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| 25 | .SH INPUT PARAMETERS |
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| 26 | .ft R |
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| 27 | .TP 1i |
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| 28 | group |
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| 29 | The group of target processes (handle). |
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| 30 | .TP 1i |
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| 31 | assert |
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| 32 | Program assertion (integer). |
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| 33 | .TP 1i |
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| 34 | win |
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| 35 | Window object (handle). |
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| 36 | |
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| 37 | .SH OUTPUT PARAMETERS |
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| 38 | .ft R |
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| 39 | .TP 1i |
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| 40 | IERROR |
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| 41 | Fortran only: Error status (integer). |
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| 42 | |
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| 43 | .SH DESCRIPTION |
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| 44 | .ft R |
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| 45 | 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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| 46 | access only windows at processes in \fIgroup\fP. Each process in \fIgroup\fP must issue a matching |
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| 47 | call to MPI_Win_post. MPI_Win_start |
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| 48 | is allowed to block until the corresponding MPI_Win_post calls have been executed, but is not required to. |
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| 49 | .sp |
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| 50 | 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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| 51 | .sp |
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| 52 | .TP 1i |
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| 53 | MPI_MODE_NOCHECK |
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| 54 | When this value is passed in to this call, the library assumes that |
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| 55 | the post call on the target has been called and it is not necessary |
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| 56 | for the library to check to see if such a call has been made. |
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| 57 | |
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| 58 | .SH ERRORS |
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| 59 | 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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| 60 | .sp |
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| 61 | Before the error value is returned, the current MPI error handler is |
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| 62 | 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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| 63 | |
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| 64 | .SH SEE ALSO |
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| 65 | MPI_Win_post |
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| 66 | MPI_Win_complete |
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| 67 | .br |
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| 68 | |
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