87 строки
3.4 KiB
Groff
87 строки
3.4 KiB
Groff
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.\"Copyright 2006, Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Testall 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Testall\fP \- Tests for the completion of all previously initiated communications 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_Testall(int \fIcount\fP, MPI_Request\fI *array_of_requests\fP,
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int\fI *flag\fP, MPI_Status\fI *array_of_statuses\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_TESTALL(\fICOUNT, ARRAY_OF_REQUESTS, FLAG, ARRAY_OF_STATUSES,
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IERROR\fP)
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LOGICAL \fIFLAG\fP
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INTEGER \fICOUNT, ARRAY_OF_REQUESTS(*)\fP
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INTEGER \fIARRAY_OF_STATUSES(MPI_STATUS_SIZE,*), 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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static bool Request::Testall(int \fIcount\fP, Request
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\fIarray_of_requests\fP[], Status \fIarray_of_statuses\fP[])
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static bool Request::Testall(int \fIcount\fP, Request \fIarray_of_requests\fP[])
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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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Lists 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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flag
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True if previously initiated communications are complete (logical.)
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.TP 1i
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array_of_statuses
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Array of status objects (array of 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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Returns \fIflag\fP = true if all communications associated with active handles in the array have completed (this includes the case where no handle in the list is active). In this case, each status entry that corresponds to an active handle request is set to the status of the corresponding communication; if the request was allocated by a nonblocking communication call then it is deallocated, and the handle is set to MPI_REQUEST_NULL. Each status entry that corresponds to a null or inactive handle is set to empty.
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.sp
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Otherwise, \fIflag\fP = false is returned, no request is modified and the values of the status entries are undefined. This is a local operation.
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.sp
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If your application does not need to examine the \fIarray_of_statuses\fP field, you can save resources by using the predefined constant MPI_STATUSES_IGNORE can be used as a special value for the \fIarray_of_statuses\fP argument.
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.sp
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Errors that occurred during the execution of MPI_Testall are handled in the same manner as errors in MPI_Waitall.
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.SH NOTE
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.ft R
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\fIflag\fP is true only if all requests have completed. Otherwise, \fIflag\fP is false,
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and neither \fIarray_of_requests\fP nor \fIarray_of_statuses\fP is modified.
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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_Waitany
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.br
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MPI_Waitsome
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.br
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MPI_Testsome
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.br
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MPI_Waitall
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' @(#)MPI_Testall.3 1.20 06/03/09
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