125 lines
4.8 KiB
C
125 lines
4.8 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_block.c
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*
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* Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxbe.h>
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#include <nuttx/nx/nxmu.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_block
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*
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* Description:
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* This is callback will do to things: (1) any queue a 'blocked' callback
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* to the window and then (2) block any further window messaging.
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*
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* The 'blocked' callback is the response from nx_block (or nxtk_block).
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* Those blocking interfaces are used to assure that no further messages are
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* are directed to the window. Receipt of the blocked callback signifies
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* that (1) there are no further pending callbacks and (2) that the
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* window is now 'defunct' and will receive no further callbacks.
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*
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* This callback supports coordinated destruction of a window in multi-
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* user mode. In multi-use mode, the client window logic must stay
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* intact until all of the queued callbacks are processed. Then the
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* window may be safely closed. Closing the window prior with pending
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* callbacks can lead to bad behavior when the callback is executed.
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*
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* Input Parameters:
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* wnd - The window to be blocked
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* arg - An argument that will accompany the block messages (This is arg2
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* in the blocked callback).
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*
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* Returned Value:
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* OK on success; ERROR on failure with errno set appropriately
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*
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****************************************************************************/
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int nx_block(NXWINDOW hwnd, FAR void *arg)
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{
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FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd;
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struct nxsvrmsg_blocked_s outmsg;
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int ret = OK;
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#ifdef CONFIG_DEBUG_FEATURES
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if (!hwnd)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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#endif
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/* Ignore additional attempts to block messages (no errors reported) */
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if (!NXBE_ISBLOCKED(wnd))
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{
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/* Mark the window as blocked. This will stop all messages to the window
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* (EXCEPT the NX_SVRMSG_BLOCKED). Blocking the messages before sending the
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* blocked message is awkward but assures that no other messages sneak into
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* the message queue before we can set the blocked state.
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*/
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NXBE_SETBLOCKED(wnd);
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/* Send the message inicating that the window is blocked (and because of
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* queue also that there are no additional queue messages for the window)
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*/
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outmsg.msgid = NX_SVRMSG_BLOCKED;
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outmsg.wnd = wnd;
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outmsg.arg = arg;
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/* Send the window message via nxmu_sendserver (vs. nxmu_sendwindow) so
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* that it will not be blocked.
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*/
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ret = nxmu_sendserver(wnd->conn, &outmsg, sizeof(struct nxsvrmsg_blocked_s));
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}
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return ret;
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}
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