VNC: Partition/rename some functionality. Add framework to support a reading and writing thread.

2026-06-06 08:22:32 +08:00 · 2016-04-17 08:20:14 -06:00
parent 9bdc08e013
commit c767686b3d
9 changed files with 532 additions and 377 deletions
@@ -0,0 +1,171 @@
+/****************************************************************************
+ * graphics/vnc/vnc_updater.c
+ *
+ *   Copyright (C) 2016 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 <sched.h>
+#include <pthread.h>
+#include <assert.h>
+
+#include "vnc_server.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vnc_updater
+ *
+ * Description:
+ *  This is the "updater" thread.  It is the sender of all Server-to-Client
+ *  messages
+ *
+ * Input Parameters:
+ *   Standard pthread arguments.
+ *
+ * Returned Value:
+ *   NULL is always returned.
+ *
+ ****************************************************************************/
+
+static FAR void *vnc_updater(FAR void *arg)
+{
+  FAR struct vnc_session_s *session = (FAR struct vnc_session_s *)arg;
+
+  DEBUGASSERT(session != NULL);
+
+  while (session->state == VNCSERVER_RUNNING)
+    {
+#warning Missing logic
+    }
+
+  return NULL; 
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vnc_start_updater
+ *
+ * Description:
+ *  Start the updater thread
+ *
+ * Input Parameters:
+ *   session - An instance of the session structure.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned on
+ *   any failure.
+ *
+ ****************************************************************************/
+
+int vnc_start_updater(FAR struct vnc_session_s *session)
+{
+  pthread_attr_t attr;
+  struct sched_param param;
+  int status;
+
+  /* Create thread that is gonna send rectangles to the client */
+
+  session->state = VNCSERVER_RUNNING;
+
+  DEBUGVERIFY(pthread_attr_init(&attr));
+  DEBUGVERIFY(pthread_attr_setstacksize(&attr, CONFIG_VNCSERVER_UPDATER_STACKSIZE));
+
+  param.sched_priority = CONFIG_VNCSERVER_UPDATER_PRIO;
+  DEBUGVERIFY(pthread_attr_setschedparam(&attr, &param));
+
+  status = pthread_create(&session->updater, &attr, vnc_updater,
+                          (pthread_addr_t)session);
+  if (status != 0)
+    {
+      return -status;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: vnc_stop_updater
+ *
+ * Description:
+ *  Stop the updater thread
+ *
+ * Input Parameters:
+ *   session - An instance of the session structure.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned on
+ *   any failure.
+ *
+ ****************************************************************************/
+
+int vnc_stop_updater(FAR struct vnc_session_s *session)
+{
+  pthread_addr_t result;
+  int status;
+
+  /* Is the update thread running? */
+
+  if (session->state == VNCSERVER_RUNNING)
+    {
+      /* Yes.. ask it to please stop */
+
+      session->state = VNCSERVER_STOPPING;
+
+      /* Wait for the thread to comply with our request */
+
+      status = pthread_join(session->updater, &result);
+      if (status != 0)
+        {
+          return -status;
+        }
+
+      /* Return what the thread returned */
+
+      return (int)((intptr_t)result);
+    }
+
+  /* Not running?  Just say we stopped the thread successfully. */
+
+  return OK;
+}
+