[264/906] Rewrite gstglwindow_x11.c because X API is not thread safe.

gst-libs/gst/gl/gstglwindow_x11.c

@@ -37,6 +37,11 @@ enum
 
 struct _GstGLWindowPrivate
 {
+  GMutex *glwin_lock;
+  GMutex *x_lock;
+  GCond *cond_send_message;
+  gboolean running;
+
   gchar *display_name;
   Display *device;
   gint screen;
@@ -57,11 +62,6 @@ struct _GstGLWindowPrivate
   gpointer resize_data;
   GstGLWindowCB close_cb;
   gpointer close_data;
-
-  gboolean is_closed;
-
-  GMutex *mutex;
-  GCond *cond_send_message;
 };
 
 G_DEFINE_TYPE (GstGLWindow, gst_gl_window, G_TYPE_OBJECT);
@@ -79,6 +79,9 @@ gst_gl_window_finalize (GObject * object)
   GstGLWindowPrivate *priv = window->priv;
   XEvent event;
 
+  g_mutex_lock (priv->glwin_lock);
+  g_mutex_lock (priv->x_lock);
+
   g_debug ("gl window finalizing\n");
 
   XUnmapWindow (priv->device, priv->internal_win_id);
@@ -97,6 +100,7 @@ gst_gl_window_finalize (GObject * object)
   }
 
   XFlush (priv->device);
+  XSync (priv->device, FALSE);
   while(XPending (priv->device))
   {
     g_debug ("one more last pending x msg\n");
@@ -109,11 +113,17 @@ gst_gl_window_finalize (GObject * object)
 
   g_debug ("display closed\n");
 
+  g_mutex_unlock (priv->glwin_lock);
+  g_mutex_unlock (priv->x_lock);
+
   if (priv->cond_send_message)
     g_cond_free (priv->cond_send_message);
 
-  if (priv->mutex)
+  if (priv->x_lock)
-    g_mutex_free (priv->mutex);
+    g_mutex_free (priv->x_lock);
+
+  if (priv->glwin_lock)
+    g_mutex_free (priv->glwin_lock);
 
   G_OBJECT_CLASS (gst_gl_window_parent_class)->finalize (object);
 
@@ -230,13 +240,17 @@ gst_gl_window_new (gint width, gint height)
   static gint x = 0;
   static gint y = 0;
 
+  priv->glwin_lock = g_mutex_new ();
+  priv->x_lock = g_mutex_new ();
+  priv->cond_send_message = g_cond_new ();
+  priv->running = TRUE;
+
+  g_mutex_lock (priv->glwin_lock);
+  g_mutex_lock (priv->x_lock);
+
   x += 20;
   y += 20;
 
-  priv->mutex = g_mutex_new ();
-  priv->cond_send_message = g_cond_new ();
-  priv->is_closed = FALSE;
-
   priv->device = XOpenDisplay (priv->display_name);
 
   g_debug ("gl device id: %ld\n", (gulong) priv->device);
@@ -268,6 +282,8 @@ gst_gl_window_new (gint width, gint height)
     width, height, 0, priv->visual_info->depth, InputOutput,
     priv->visual_info->visual, mask, &win_attr);
 
+  XSync (priv->device, FALSE);
+
   g_debug ("gl window id: %lld\n", (guint64) priv->internal_win_id);
 
   priv->gl_context = glXCreateContext (priv->device, priv->visual_info, NULL, TRUE);
@@ -300,6 +316,9 @@ gst_gl_window_new (gint width, gint height)
   if (!ret)
     g_debug ("failed to make opengl context current\n");
 
+  g_mutex_unlock (priv->x_lock);
+  g_mutex_unlock (priv->glwin_lock);
+
   return window;
 }
 
@@ -343,8 +362,12 @@ gst_gl_window_set_draw_callback (GstGLWindow *window, GstGLWindowCB callback, gp
 {
   GstGLWindowPrivate *priv = window->priv;
 
+  g_mutex_lock (priv->glwin_lock);
+
   priv->draw_cb = callback;
   priv->draw_data = data;
+
+  g_mutex_unlock (priv->glwin_lock);
 }
 
 /* Must be called in the gl thread */
@@ -353,8 +376,12 @@ gst_gl_window_set_resize_callback (GstGLWindow *window, GstGLWindowCB2 callback
 {
   GstGLWindowPrivate *priv = window->priv;
 
+  g_mutex_lock (priv->glwin_lock);
+
   priv->resize_cb = callback;
   priv->resize_data = data;
+
+  g_mutex_unlock (priv->glwin_lock);
 }
 
 /* Must be called in the gl thread */
@@ -363,16 +390,28 @@ gst_gl_window_set_close_callback (GstGLWindow *window, GstGLWindowCB callback, g
 {
   GstGLWindowPrivate *priv = window->priv;
 
+  g_mutex_lock (priv->glwin_lock);
+
   priv->close_cb = callback;
   priv->close_data = data;
+
+  g_mutex_unlock (priv->glwin_lock);
 }
 
 /* Thread safe */
 void
 gst_gl_window_visible (GstGLWindow *window, gboolean visible)
+{
+  if (window)
   {
     GstGLWindowPrivate *priv = window->priv;
 
+    g_mutex_lock (priv->glwin_lock);
+
+    if (priv->running)
+    {
+      g_mutex_lock (priv->x_lock);
+
       g_debug ("set visible %lld\n", (guint64) priv->internal_win_id);
 
       if (visible)
@@ -381,16 +420,32 @@ gst_gl_window_visible (GstGLWindow *window, gboolean visible)
         XUnmapWindow (priv->device, priv->internal_win_id);
 
       XSync(priv->device, FALSE);
+
+      g_mutex_unlock (priv->x_lock);
+    }
+
+    g_mutex_unlock (priv->glwin_lock);
+  }
 }
 
 /* Thread safe */
 void
 gst_gl_window_draw (GstGLWindow *window)
+{
+  g_debug ("DRAW IN\n");
+  if (window)
   {
     GstGLWindowPrivate *priv = window->priv;
+
+    g_mutex_lock (priv->glwin_lock);
+
+    if (priv->running)
+    {
       XEvent event;
       XWindowAttributes attr;
 
+      g_mutex_lock (priv->x_lock);
+
       XGetWindowAttributes (priv->device, priv->internal_win_id, &attr);
 
       event.xexpose.type = Expose;
@@ -402,20 +457,37 @@ gst_gl_window_draw (GstGLWindow *window)
       event.xexpose.width = attr.width;
       event.xexpose.height = attr.height;
       event.xexpose.count = 0;
+
       XSendEvent (priv->device, priv->internal_win_id, FALSE, ExposureMask, &event);
+
+      g_mutex_unlock (priv->x_lock);
+    }
+
+    g_mutex_unlock (priv->glwin_lock);
+  }
+  g_debug ("DRAW OUT\n");
 }
 
 void
 gst_gl_window_run_loop (GstGLWindow *window)
 {
   GstGLWindowPrivate *priv = window->priv;
-  gboolean running = TRUE;
-  XEvent event;
 
   g_debug ("begin loop\n");
 
-  while (running)
+  g_mutex_lock (priv->glwin_lock);
+
+  while (priv->running)
   {
+
+    g_mutex_unlock (priv->glwin_lock);
+
+    g_mutex_lock (priv->x_lock);
+
+    while (XPending (priv->device))
+    {
+      XEvent event;
+
       XNextEvent(priv->device, &event);
 
       switch (event.type)
@@ -426,7 +498,7 @@ gst_gl_window_run_loop (GstGLWindow *window)
           if (event.xclient.message_type == priv->atom_custom)
           {
 
-          if (!priv->is_closed)
+            if (priv->running)
             {
               GstGLWindowCB custom_cb = (GstGLWindowCB) event.xclient.data.l[0];
               gpointer custom_data = (gpointer) event.xclient.data.l[1];
@@ -442,12 +514,9 @@ gst_gl_window_run_loop (GstGLWindow *window)
 
             g_debug ("Close\n");
 
-          g_mutex_lock (priv->mutex);
+            priv->running = FALSE;
-
-          priv->is_closed = TRUE;
             if (priv->close_cb)
               priv->close_cb (priv->close_data);
-          running = FALSE;
 
             XFlush (priv->device);
             while (XCheckTypedEvent (priv->device, ClientMessage, &event))
@@ -455,8 +524,6 @@ gst_gl_window_run_loop (GstGLWindow *window)
               g_debug ("discared custom x event\n");
               g_cond_signal (priv->cond_send_message);
             }
-
-          g_mutex_unlock (priv->mutex);
           }
           break;
         }
@@ -486,8 +553,6 @@ gst_gl_window_run_loop (GstGLWindow *window)
 
         case VisibilityNotify:
         {
-        g_debug ("VisibilityNotify\n");
-
           switch (event.xvisibility.state)
           {
             case VisibilityUnobscured:
@@ -513,8 +578,19 @@ gst_gl_window_run_loop (GstGLWindow *window)
         default:
           break;
 
-    }
+      }// switch
-  }
+
+    }// while XPending
+
+    g_mutex_unlock (priv->x_lock);
+
+    g_usleep (10000);
+
+    g_mutex_lock (priv->glwin_lock);
+
+  }// while running
+
+  g_mutex_unlock (priv->glwin_lock);
 
   g_debug ("end loop\n");
 }
@@ -523,49 +599,38 @@ gst_gl_window_run_loop (GstGLWindow *window)
 void
 gst_gl_window_quit_loop (GstGLWindow *window)
 {
+  g_debug ("QUIT LOOP IN\n");
   if (window)
   {
     GstGLWindowPrivate *priv = window->priv;
 
-    g_mutex_lock (priv->mutex);
+    g_mutex_lock (priv->glwin_lock);
 
-    if (!priv->is_closed)
+    priv->running = FALSE;
-    {
-
-      XEvent event;
-
-      event.xclient.type = ClientMessage;
-      event.xclient.send_event = TRUE;
-      event.xclient.display = priv->device;
-      event.xclient.window = priv->internal_win_id;
-      event.xclient.message_type = 0;
-      event.xclient.format = 32;
-      event.xclient.data.l[0] = priv->atom_delete_window;
-
-      XSendEvent (priv->device, priv->internal_win_id, FALSE, NoEventMask, &event);
-      XFlush (priv->device);
 
+    g_mutex_unlock (priv->glwin_lock);
   }
-
+  g_debug ("QUIT LOOP OUT\n");
-    g_mutex_unlock (priv->mutex);
-  }
 }
 
 /* Thread safe */
 void
 gst_gl_window_send_message (GstGLWindow *window, GstGLWindowCB callback, gpointer data)
 {
+  g_debug ("CUSTOM IN\n");
   if (window)
   {
 
     GstGLWindowPrivate *priv = window->priv;
 
-    g_mutex_lock (priv->mutex);
+    g_mutex_lock (priv->glwin_lock);
 
-    if (!priv->is_closed)
+    if (priv->running)
     {
       XEvent event;
 
+      g_mutex_lock (priv->x_lock);
+
       event.xclient.type = ClientMessage;
       event.xclient.send_event = TRUE;
       event.xclient.display = priv->device;
@@ -578,9 +643,12 @@ gst_gl_window_send_message (GstGLWindow *window, GstGLWindowCB callback, gpointe
       XSendEvent (priv->device, priv->internal_win_id, FALSE, NoEventMask, &event);
       XFlush (priv->device);
 
-      g_cond_wait (priv->cond_send_message, priv->mutex);
+      g_mutex_unlock (priv->x_lock);
+
+      g_cond_wait (priv->cond_send_message, priv->glwin_lock);
     }
 
-    g_mutex_unlock (priv->mutex);
+    g_mutex_unlock (priv->glwin_lock);
   }
+  g_debug ("CUSTOM OUT\n");
 }