102 строки
3.3 KiB
Plaintext
102 строки
3.3 KiB
Plaintext
.\" -*- nroff -*-
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.\" Copyright 2015 Los Alamos National Security, LLC. All rights reserved.
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.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2007-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.\" $COPYRIGHT$
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.TH MPI_Win_shared_query 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Win_shared_query\fP \- Query a shared memory window
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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_Win_shared_query (MPI_Win \fIwin\fP, int \fIrank\fP, MPI_Aint *\fIsize\fP,
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int *\fIdisp_unit\fP, void *\fIbaseptr\fP)
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.fi
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.SH Fortran Syntax
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.nf
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USE MPI
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! or the older form: INCLUDE 'mpif.h'
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MPI_WIN_SHARED_QUERY(WIN, RANK, SIZE, DISP_UNIT, BASEPTR, IERROR)
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INTEGER WIN, RANK, DISP_UNIT, IERROR
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INTEGER(KIND=MPI_ADDRESS_KIND) SIZE, BASEPTR
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.fi
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.SH Fortran 2008 Syntax
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.nf
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USE mpi_f08
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MPI_Win_shared_query(\fIwin\fP, \fIrank\fP, \fIsize\fP, \fIdisp_unit\fP, \fIbaseptr\fP, \fIierror\fP)
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USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
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TYPE(MPI_Win), INTENT(IN) :: \fIwin\fP
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INTEGER, INTENT(IN) :: \fIrank\fP
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INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: \fIsize\fP
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INTEGER, INTENT(OUT) :: \fIdisp_unit\fP
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TYPE(C_PTR), INTENT(OUT) :: \fIbaseptr\fP
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INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\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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win
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Shared memory window object (handle).
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.TP 1i
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rank
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Rank in the group of window \fIwin\fP (non-negative integer)
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or MPI_PROC_NULL.
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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size
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Size of the window segment (non-negative integer).
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.TP 1i
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disp_unit
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Local unit size for displacements, in bytes (positive integer).
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.TP 1i
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baseptr
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Address for load/store access to window segment
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(choice).
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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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\fBMPI_Win_shared_query\fP queries the process-local address for
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remote memory segments created with MPI_Win_allocate_shared. This
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function can return different process-local addresses for the same
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physical memory on different processes. The returned memory can be
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used for load/store accesses subject to the constraints defined in
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MPI-3.1 \[char167] 11.7. This function can only be called with windows
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of flavor MPI_WIN_FLAVOR_SHARED. If the passed window is not of flavor
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MPI_WIN_FLAVOR_SHARED, the error MPI_ERR_RMA_FLAVOR is raised. When
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rank is MPI_PROC_NULL, the \fIpointer\fP, \fIdisp_unit\fP, and
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\fIsize\fP returned are the pointer, disp_unit, and size of the memory
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segment belonging the lowest rank that specified \fIsize\fP > 0. If
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all processes in the group attached to the window specified \fIsize\fP
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= 0, then the call returns \fIsize\fP = 0 and a \fIbaseptr\fP as if
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\fBMPI_Alloc_mem\fP was called with \fIsize\fP = 0.
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.SH ERRORS
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Almost all MPI routines return an error value; C routines as the value
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of the function and Fortran routines in the last argument.
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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; the predefined error handler
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MPI_ERRORS_RETURN may be used to cause error values to be
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returned. Note that MPI does not guarantee that an MPI program can
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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_Alloc_mem
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MPI_Win_allocate_shared
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