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livetrax/libs/pbd/base_ui.cc

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/*
* Copyright (C) 2000-2016 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2008-2009 David Robillard <d@drobilla.net>
* Copyright (C) 2011-2012 Carl Hetherington <carl@carlh.net>
* 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.
*/
#include <cstring>
#include <stdint.h>
#ifdef COMPILER_MSVC
#include <io.h> // Microsoft's nearest equivalent to <unistd.h>
#else
#include <unistd.h>
#endif
#include <fcntl.h>
#include <cerrno>
#include <cstring>
#include <pthread.h>
#include <sched.h>
#include "pbd/base_ui.h"
#include "pbd/debug.h"
#include "pbd/pthread_utils.h"
#include "pbd/error.h"
#include "pbd/compose.h"
#include "pbd/failed_constructor.h"
#include "pbd/i18n.h"
#include "pbd/debug.h"
using namespace std;
using namespace PBD;
using namespace Glib;
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uint64_t BaseUI::rt_bit = 1;
int BaseUI::_thread_priority = PBD_RT_PRI_PROC - 1;
BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
BaseUI::RequestType BaseUI::Quit = BaseUI::new_request_type();
BaseUI::BaseUI (const string& loop_name)
: EventLoop (loop_name)
, m_context(MainContext::get_default())
, _run_loop_thread (0)
, request_channel (true)
{
base_ui_instance = this;
request_channel.set_receive_handler (sigc::mem_fun (*this, &BaseUI::request_handler));
/* derived class must set _ok */
}
BaseUI::~BaseUI()
{
delete _run_loop_thread;
}
BaseUI::RequestType
BaseUI::new_request_type ()
{
RequestType rt;
/* XXX catch out-of-range */
rt = RequestType (rt_bit);
rt_bit <<= 1;
return rt;
}
int
BaseUI::set_thread_priority () const
{
return pbd_set_thread_priority (pthread_self(), PBD_SCHED_FIFO, _thread_priority);
}
void
BaseUI::main_thread ()
{
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pthread_set_name (string_compose ("UI:%1", event_loop_name ()).c_str ());
DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: event loop running in thread %2\n", event_loop_name(), pthread_name()));
set_event_loop_for_thread (this);
thread_init ();
_main_loop->get_context()->signal_idle().connect (sigc::mem_fun (*this, &BaseUI::signal_running));
_main_loop->run ();
}
bool
BaseUI::signal_running ()
{
Glib::Threads::Mutex::Lock lm (_run_lock);
_running.signal ();
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return false; // don't call it again
}
void
BaseUI::run ()
{
/* to be called by UI's that need/want their own distinct, self-created event loop thread.
*/
m_context = MainContext::create();
_main_loop = MainLoop::create (m_context);
attach_request_source ();
Glib::Threads::Mutex::Lock lm (_run_lock);
_run_loop_thread = PBD::Thread::create (boost::bind (&BaseUI::main_thread, this));
_running.wait (_run_lock);
}
void
BaseUI::quit ()
{
if (_main_loop && _main_loop->is_running()) {
_main_loop->quit ();
_run_loop_thread->join ();
}
}
bool
BaseUI::request_handler (Glib::IOCondition ioc)
{
/* check the request pipe */
if (ioc & IO_IN) {
request_channel.drain ();
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/* there may been an error. we'd rather handle requests first,
and then get IO_HUP or IO_ERR on the next loop.
*/
/* handle requests */
DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: request handler\n", event_loop_name()));
handle_ui_requests ();
}
if (ioc & ~(IO_IN|IO_PRI)) {
_main_loop->quit ();
}
return true;
}
void
BaseUI::signal_new_request ()
{
DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: signal_new_request\n", event_loop_name()));
request_channel.wakeup ();
}
/**
* This method relies on the caller having already set m_context
*/
void
BaseUI::attach_request_source ()
{
DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: attach request source\n", event_loop_name()));
request_channel.attach (m_context);
}