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
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+++ b/nuttx/graphics/nxmu/nx_block.c
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+/****************************************************************************
+ * 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;
+}
+