127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
/*
|
|
* Copyright (C) 2000-2015 Paul Davis <paul@linuxaudiosystems.com>
|
|
* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
|
|
* Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <string>
|
|
#include <stdint.h>
|
|
|
|
#include <sigc++/slot.h>
|
|
#include <sigc++/trackable.h>
|
|
|
|
#include <glibmm/threads.h>
|
|
#include <glibmm/main.h>
|
|
|
|
#include "pbd/libpbd_visibility.h"
|
|
#include "pbd/crossthread.h"
|
|
#include "pbd/event_loop.h"
|
|
#include "pbd/pthread_utils.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 LIBPBD_API BaseUI : public sigc::trackable, public PBD::EventLoop
|
|
{
|
|
public:
|
|
BaseUI (const std::string& name);
|
|
virtual ~BaseUI();
|
|
|
|
BaseUI* base_instance() { return base_ui_instance; }
|
|
|
|
Glib::RefPtr<Glib::MainLoop> main_loop() const { return _main_loop; }
|
|
bool caller_is_self () const { return _run_loop_thread ? _run_loop_thread->caller_is_self () : true; }
|
|
|
|
bool ok() const { return _ok; }
|
|
|
|
static RequestType new_request_type();
|
|
static RequestType CallSlot;
|
|
static RequestType Quit;
|
|
|
|
static void set_thread_priority (int p) {
|
|
_thread_priority = p;
|
|
}
|
|
|
|
/** 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:
|
|
bool _ok;
|
|
|
|
Glib::RefPtr<Glib::MainLoop> _main_loop;
|
|
Glib::RefPtr<Glib::MainContext> m_context;
|
|
PBD::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 () {};
|
|
|
|
int set_thread_priority () const;
|
|
|
|
/** Called when there input ready on the request_channel
|
|
*/
|
|
bool request_handler (Glib::IOCondition);
|
|
|
|
void signal_new_request ();
|
|
void attach_request_source ();
|
|
|
|
virtual void maybe_install_precall_handler (Glib::RefPtr<Glib::MainContext>) {}
|
|
|
|
/** 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:
|
|
BaseUI* base_ui_instance;
|
|
|
|
CrossThreadChannel request_channel;
|
|
|
|
static uint64_t rt_bit;
|
|
static int _thread_priority;
|
|
|
|
int setup_request_pipe ();
|
|
void main_thread ();
|
|
};
|
|
|