153 строки
5.9 KiB
Plaintext
153 строки
5.9 KiB
Plaintext
.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Waitsome 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Waitsome\fP \- Waits for some given communications to complete.
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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_Waitsome(int \fIincount\fP, MPI_Request \fI*array_of_requests\fP,
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int\fI *outcount\fP, int\fI *array_of_indices\fP,
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MPI_Status \fI*array_of_statuses\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_WAITSOME(\fIINCOUNT, ARRAY_OF_REQUESTS, OUTCOUNT,
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ARRAY_OF_INDICES, ARRAY_OF_STATUSES, IERROR\fP)
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INTEGER \fIINCOUNT, ARRAY_OF_REQUESTS(*), OUTCOUNT\fP
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INTEGER \fIARRAY_OF_INDICES(*)\fP
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INTEGER \fIARRAY_OF_STATUSES(MPI_STATUS_SIZE*)\fP
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INTEGER \fIIERROR\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 int Request::Waitsome(int \fIincount\fP, Request
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\fIarray_of_requests\fP[], int \fIarray_of_indices\fP[], Status \fIarray_of_statuses\fP[])
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static int Request::Waitsome(int \fIincount\fP, Request
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\fIarray_of_requests\fP[], int \fIarray_of_indices\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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incount
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Length of array_of_requests (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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outcount
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Number of completed requests (integer).
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.TP 1i
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array_of_indices
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Array of indices of operations that completed (array of integers).
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.TP 1i
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array_of_statuses
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Array of status objects for operations that completed (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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Waits until at least one of the operations associated with active handles in the list have completed. Returns in outcount the number of requests from the list array_of_requests that have completed. Returns in the first outcount locations of the array array_of_indices the indices of these operations (index within the array array_of_requests; the array is indexed from 0 in C and from 1 in Fortran). Returns in the first outcount locations of the array array_of_status the status for these completed operations. If a request that completed was allocated by a nonblocking communication call, then it is deallocated, and the associated handle is set to MPI_REQUEST_NULL.
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.sp
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If the list contains no active handles, then the call returns immediately with outcount = MPI_UNDEFINED.
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.sp
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When one or more of the communications completed by MPI_Waitsome fails, then it is desirable to return specific information on each communication. The arguments outcount, array_of_indices, and array_of_statuses will be adjusted to indicate completion of all communications that have succeeded or failed. The call will return the error code MPI_ERR_IN_STATUS and the error field of each status returned will be set to indicate success or to indicate the specific error that occurred. The call will return MPI_SUCCESS if no request resulted in an error, and will return another error code if it failed for other reasons (such as invalid arguments). In such cases, it will not update the error fields of the statuses.
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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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\fBExample:\fR Same code as the example in the MPI_Waitany man page, but using MPI_Waitsome.
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.sp
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.nf
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CALL MPI_COMM_SIZE(comm, size, ierr)
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CALL MPI_COMM_RANK(comm, rank, ierr)
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IF(rank .GT. 0) THEN ! client code
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DO WHILE(.TRUE.)
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CALL MPI_ISEND(a, n, MPI_REAL, 0, tag, comm, request, ierr)
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CALL MPI_WAIT(request, status, ierr)
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END DO
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ELSE ! rank=0 -- server code
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DO i=1, size-1
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CALL MPI_IRECV(a(1,i), n, MPI_REAL, i, tag,
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comm, requests(i), ierr)
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END DO
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DO WHILE(.TRUE.)
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CALL MPI_WAITSOME(size, request_list, numdone,
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indices, statuses, ierr)
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DO i=1, numdone
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CALL DO_SERVICE(a(1, indices(i)))
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CALL MPI_IRECV(a(1, indices(i)), n, MPI_REAL, 0, tag,
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comm, requests(indices(i)), ierr)
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END DO
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END DO
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END IF
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.fi
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.sp
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.SH NOTES
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.ft R
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The array of indices are in the range 0 to incount-1 for C and in the range 1 to incount for Fortran.
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.SH ERRORS
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For each invocation of MPI_Waitsome, if one or more requests generate
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an MPI exception, only the \fIfirst\fP MPI request that caused an
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exception will be passed to its corresponding error handler. No other
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error handlers will be invoked (even if multiple requests generated
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exceptions). However, \fIall\fP requests that generate an exception
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will have a relevant error code set in the corresponding
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status.MPI_ERROR field (unless MPI_IGNORE_STATUSES was used).
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.sp
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The default error handler aborts the MPI job, except for I/O function
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errors. The error handler may be changed with MPI_Comm_set_errhandler,
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MPI_File_set_errhandler, or MPI_Win_set_errhandler (depending on the
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type of MPI handle that generated the MPI request); the predefined
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error handler MPI_ERRORS_RETURN may be used to cause error values to
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be returned. Note that MPI does not guarantee that an MPI program can
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continue past an error.
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.sp
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If the invoked error handler allows MPI_Waitsome to return to the
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caller, the value MPI_ERR_IN_STATUS will be returned in the C and
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Fortran bindings. In C++, if the predefined error handler
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MPI::ERRORS_THROW_EXCEPTIONS is used, the value MPI::ERR_IN_STATUS
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will be contained in the MPI::Exception object. The MPI_ERROR field
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can then be examined in the array of returned statuses to determine
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exactly which request(s) generated an exception.
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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_Testany
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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_Win_set_errhandler
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.br
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