X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fpbd%2Fbase_ui.h;h=186a3c55a659e346c7e723d5a2ba4f457adf5623;hb=ff2fac11a03b7e13149b5069fda2bbc21cdd4e80;hp=b4570f87076bfec2d7686056ddcf13f7ba8cb3fd;hpb=481f7c39655afec832ac10430dd61a3bb464aa58;p=ardour.git

diff --git a/libs/pbd/pbd/base_ui.h b/libs/pbd/pbd/base_ui.h
index b4570f8707..186a3c55a6 100644
--- a/libs/pbd/pbd/base_ui.h
+++ b/libs/pbd/pbd/base_ui.h
@@ -1,3 +1,22 @@
+/*
+    Copyright (C) 2000-2009 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
 #ifndef __pbd_base_ui_h__
 #define __pbd_base_ui_h__
 
@@ -7,40 +26,90 @@
 #include <sigc++/slot.h>
 #include <sigc++/trackable.h>
 
-class BaseUI : virtual public sigc::trackable {
+#include <glibmm/threads.h>
+#include <glibmm/main.h>
+
+#include "pbd/crossthread.h"
+#include "pbd/event_loop.h"
+
+/** A BaseUI is an abstraction designed to be used with any "user
+ * interface" (not necessarily graphical) that needs to wait on
+ * events/requests and dispatch/process them as they arrive.
+ *
+ * This implementation starts up a thread that runs a Glib main loop
+ * to wait on events/requests etc. 
+ */
+
+
+class BaseUI : public sigc::trackable, public PBD::EventLoop
+{
   public:
-	BaseUI (std::string name, bool with_signal_pipes);
+	BaseUI (const std::string& name);
 	virtual ~BaseUI();
 
 	BaseUI* base_instance() { return base_ui_instance; }
 
+	Glib::RefPtr<Glib::MainLoop> main_loop() const { return _main_loop; }
+        Glib::Threads::Thread* event_loop_thread() const { return run_loop_thread; }
+        bool caller_is_self () const { return Glib::Threads::Thread::self() == run_loop_thread; }
+
 	std::string name() const { return _name; }
 
 	bool ok() const { return _ok; }
-
-	enum RequestType {
-		range_guarantee = ~0
-	};
-
-	struct BaseRequestObject {
-	    RequestType type;
-	    sigc::slot<void> the_slot;
-	};
-
+	
 	static RequestType new_request_type();
 	static RequestType CallSlot;
+	static RequestType Quit;
+
+	/** start up a thread to run the main loop 
+	 */
+	void run ();
+
+	/** stop the thread running the main loop (and block
+	 *   until it exits)
+	 */
+	void quit ();
 
   protected:
-	int signal_pipe[2];
+	CrossThreadChannel request_channel;
 	bool _ok; 
 
+	Glib::RefPtr<Glib::MainLoop> _main_loop;
+        Glib::Threads::Thread*       run_loop_thread;
+	Glib::Threads::Mutex        _run_lock;
+        Glib::Threads::Cond         _running;
+
+	/* this signals _running from within the event loop,
+	   from an idle callback 
+	*/
+
+	bool signal_running ();
+
+	/** Derived UI objects can implement thread_init()
+	 * which will be called by the event loop thread
+	 * immediately before it enters the event loop.
+	 */
+
+	virtual void thread_init () {};
+
+	/** Called when there input ready on the request_channel
+	 */
+	bool request_handler (Glib::IOCondition);
+
+	/** Derived UI objects must implement this method,
+	 * which will be called whenever there are requests
+	 * to be dealt with.
+	 */
+	virtual void handle_ui_requests () = 0;
+
   private:
 	std::string _name; 
 	BaseUI* base_ui_instance;
+	
+	static uint64_t rt_bit;
 
-	static uint32_t rt_bit;
-
-	int setup_signal_pipe ();
+	int setup_request_pipe ();
+	void main_thread ();
 };
 
 #endif /* __pbd_base_ui_h__ */