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Diffstat (limited to 'nuttx/graphics/nxmu/nx_block.c')
-rw-r--r-- | nuttx/graphics/nxmu/nx_block.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/nuttx/graphics/nxmu/nx_block.c b/nuttx/graphics/nxmu/nx_block.c new file mode 100644 index 000000000..2f069f096 --- /dev/null +++ b/nuttx/graphics/nxmu/nx_block.c @@ -0,0 +1,148 @@ +/**************************************************************************** + * graphics/nxmu/nx_block.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <errno.h> +#include <debug.h> + +#include <nuttx/nx/nx.h> + +#include "nxbe.h" +#include "nxfe.h" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nx_block + * + * Description: + * This is callback will do to things: (1) any queue a 'blocked' callback + * to the window and then (2) block any further window messaging. + * + * The 'blocked' callback is the response from nx_block (or nxtk_block). + * Those blocking interfaces are used to assure that no further messages are + * are directed to the window. Receipt of the blocked callback signifies + * that (1) there are no further pending callbacks and (2) that the + * window is now 'defunct' and will receive no further callbacks. + * + * This callback supports coordinated destruction of a window in multi- + * user mode. In multi-use mode, the client window logic must stay + * intact until all of the queued callbacks are processed. Then the + * window may be safely closed. Closing the window prior with pending + * callbacks can lead to bad behavior when the callback is executed. + * + * Multiple user mode only! + * + * Input Parameters: + * wnd - The window to be blocked + * arg - An argument that will accompany the block messages (This is arg2 + * in the blocked callback). + * + * Return: + * OK on success; ERROR on failure with errno set appropriately + * + ****************************************************************************/ + +int nx_block(NXWINDOW hwnd, FAR void *arg) +{ + FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd; + struct nxsvrmsg_blocked_s outmsg; + int ret = OK; + +#ifdef CONFIG_DEBUG + if (!hwnd) + { + errno = EINVAL; + return NULL; + } +#endif + + /* Ignore additional attempts to block messages (no errors reported) */ + + if (!NXBE_ISBLOCKED(wnd)) + { + /* Mark the window as blocked. This will stop all messages to the window + * (EXCEPT the NX_SVRMSG_BLOCKED). Blocking the messages before sending the + * blocked message is awkward but assures that no other messages sneak into + * the message queue before we can set the blocked state. + */ + + NXBE_SETBLOCKED(wnd); + + /* Send the message inicating that the window is blocked (and because of + * queue also that there are no additional queue messages for the window) + */ + + outmsg.msgid = NX_SVRMSG_BLOCKED; + outmsg.wnd = wnd; + outmsg.arg = arg; + + /* Send the window message via nxmu_sendserver (vs. nxmu_sendwindow) so + * that it will not be blocked. + */ + + ret = nxmu_sendserver(wnd->conn, &outmsg, sizeof(struct nxbe_window_s)); + } + + return ret; +} + |