116 строки
4.4 KiB
Plaintext
116 строки
4.4 KiB
Plaintext
.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Testany 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Testany\fP \- Tests for completion of any one previously initiated communication in a list.
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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_Testany(int \fIcount\fP, MPI_Request\fI *array_of_requests\fP,
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int\fI *index\fP, int\fI *flag\fP, MPI_Status\fI *status\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_TESTANY(\fICOUNT, ARRAY_OF_REQUESTS, INDEX, FLAG, STATUS, IERROR\fP)
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LOGICAL \fIFLAG\fP
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INTEGER \fICOUNT, ARRAY_OF_REQUESTS(*), INDEX\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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static bool Request::Testany(int \fIcount\fP, Request \fIarray_of_requests\fP[],
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int& \fIindex\fP, Status& \fIstatus\fP)
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static bool Request::Testany(int \fIcount\fP, Request \fIarray_of_requests\fP[],
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int& \fIindex\fP)
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.fi
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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count
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List length (integer).
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.TP 1i
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array_of_requests
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Array of requests (array of handles).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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index
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Index of operation that completed, or MPI_UNDEFINED if none completed
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(integer).
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.TP 1i
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flag
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True if one of the operations is complete (logical).
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.TP 1i
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status
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Status object (status).
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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_Testany tests for completion of either one or none of the operations associated with active handles. In the former case, it returns \fIflag\fP = true, returns in \fIindex\fP the index of this request in the array, and returns in \fIstatus\fP the status of that operation; if the request was allocated by a nonblocking communication call then the request is deallocated and the handle is set to MPI_REQUEST_NULL. (The array is indexed from 0 in C, and from 1 in Fortran.) In the latter case (no operation completed), it returns \fIflag\fP = false, returns a value of MPI_UNDEFINED in \fIindex\fP, and \fIstatus\fP is undefined.
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.sp
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The array may contain null or inactive handles. If the array contains no active handles then the call returns immediately with \fIflag\fP = true, \fIindex\fP = MPI_UNDEFINED, and an empty \fIstatus\fP.
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.sp
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If the array of requests contains active handles then the execution of
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MPI_Testany(count, array_of_requests, index, status) has the same effect as the execution of MPI_Test(&\fIarray_of_requests[i\fP], \fIflag\fP, \fIstatus\fP), for \fIi\fP=0,1,...,count-1, in some arbitrary order, until one call returns \fIflag\fP = true, or all fail. In the former case, \fIindex\fP is set to the last value of \fIi\fP, and in the latter case, it is set to MPI_UNDEFINED. MPI_Testany with an array containing one active entry is equivalent to MPI_Test.
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.sp
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If your application does not need to examine the \fIstatus\fP field, you can save resources by using the predefined constant MPI_STATUS_IGNORE as a special value for the \fIstatus\fP argument.
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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
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I/O function errors. The error handler may be changed with
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MPI_Comm_set_errhandler, MPI_File_set_errhandler, or
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MPI_Win_set_errhandler (depending on the type of MPI handle that
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generated the request); the predefined error handler MPI_ERRORS_RETURN
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may be used to cause error values to be returned. Note that MPI does
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not guarantee that an MPI program can continue past an error.
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.sp
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Note that per MPI-1 section 3.2.5, MPI exceptions on requests passed
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to MPI_TESTANY do not set the status.MPI_ERROR field in the returned
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status. The error code is passed to the back-end error handler and
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may be passed back to the caller through the return value of
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MPI_TESTANY if the back-end error handler returns it. The pre-defined
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MPI error handler MPI_ERRORS_RETURN exhibits this behavior, for
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example.
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.SH SEE ALSO
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.ft R
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.sp
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MPI_Comm_set_errhandler
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.br
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MPI_File_set_errhandler
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.br
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MPI_Test
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.br
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MPI_Testall
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.br
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MPI_Testsome
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.br
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MPI_Wait
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.br
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MPI_Waitall
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.br
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MPI_Waitany
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.br
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MPI_Waitsome
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.br
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MPI_Win_set_errhandler
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.br
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