62 строки
2.1 KiB
Plaintext
62 строки
2.1 KiB
Plaintext
.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Test_cancelled 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Test_cancelled\fP \- Tests whether a request was canceled.
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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_Test_cancelled(MPI_Status *\fIstatus\fP, int \fI*flag\fP)
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.fi
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.SH Fortran Syntax
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.nf
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INCLUDE 'mpif.h'
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MPI_TEST_CANCELLED(\fISTATUS, FLAG, IERROR\fP)
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LOGICAL \fIFLAG\fP
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INTEGER \fISTATUS(MPI_STATUS_SIZE), IERROR\fP
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.fi
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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bool Status::Is_cancelled() const
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.fi
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.SH INPUT PARAMETER
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.ft R
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.TP 1i
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status
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Status object (status).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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flag
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True if operation was cancelled (logical).
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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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Returns \fIflag\fP = true if the communication associated with the status object
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was canceled successfully. In such a case, all other fields of status (such as \fIcount\fP or \fItag\fP) are undefined. Otherwise, returns \fIflag\fP = false. If a receive operation might be canceled, one should call MPI_Test_cancelled first, to check whether the operation was canceled, before checking on the other fields of the return status.
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.SH NOTES
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Cancel can be an expensive operation that should be used only exceptionally.
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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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