59cc09fd1a
This commit was SVN r13456. The following Trac tickets were found above: Ticket 850 --> https://svn.open-mpi.org/trac/ompi/ticket/850
70 строки
2.6 KiB
Groff
70 строки
2.6 KiB
Groff
.\"Copyright 2006, Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Start 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Start\fP \- Initiates a communication using a persistent request handle.
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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_Start(MPI_Request *\fIrequest\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_START(\fIREQUEST, IERROR\fP)
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INTEGER \fIREQUEST, 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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void Prequest::Start()
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.SH INPUT PARAMETER
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.ft R
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.TP 1i
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request
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Communication request (handle).
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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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A communication (send or receive) that uses a persistent request is initiated by the function MPI_Start.
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.sp
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The argument, request, is a handle returned by one of the persistent communication-request initialization functions (MPI_Send_init, MPI_Bsend_init, MPI_Ssend_init, MPI_Rsend_init, MPI_Recv_init). The associated request should be inactive and becomes active once the call is made.
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.sp
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If the request is for a send with ready mode, then a matching receive should be posted before the call is made. From the time the call is made until after the operation completes, the communication buffer should not be accessed.
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.sp
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The call is local, with semantics similar to the nonblocking communication operations (see Section 3.7 in the MPI-1 Standard, "Nonblocking Communication.") That is, a call to MPI_Start with a request created by MPI_Send_init starts a communication in the same manner as a call to MPI_Isend; a call to MPI_Start with a request created by MPI_Bsend_init starts a communication in the same manner as a call to MPI_Ibsend; and so on.
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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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.sp
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MPI_Bsend_init
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.br
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MPI_Rsend_init
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.br
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MPI_Send_init
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.br
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MPI_Sssend_init
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.br
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MPI_Recv_init
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.br
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MPI_Startall
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' @(#)MPI_Start.3 1.20 06/03/09
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