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livetrax/libs/pbd/base_ui.cc
Paul Davis 4adb2f97cc Use timeout source to process ui requests on windows
Using a timeout source to process ui events/requests is suboptimal
but it works for the moment. Have to use g_source functions as glibmm
functions are not thread safe AFAIK.

Behaviour should be exactly the same on unix.
2013-07-11 12:56:35 -04:00

195 lines
4.2 KiB
C++

/*
Copyright (C) 2000-2007 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.
*/
#include <cstring>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <cerrno>
#include <cstring>
#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 "i18n.h"
#include "pbd/debug.h"
using namespace std;
using namespace PBD;
using namespace Glib;
uint64_t BaseUI::rt_bit = 1;
BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
BaseUI::RequestType BaseUI::Quit = BaseUI::new_request_type();
BaseUI::BaseUI (const string& str)
: m_context(MainContext::get_default())
, run_loop_thread (0)
, _name (str)
#ifndef WIN32
, request_channel (true)
#endif
{
base_ui_instance = this;
#ifndef WIN32
request_channel.ios()->connect (sigc::mem_fun (*this, &BaseUI::request_handler));
#endif
/* derived class must set _ok */
}
BaseUI::~BaseUI()
{
}
BaseUI::RequestType
BaseUI::new_request_type ()
{
RequestType rt;
/* XXX catch out-of-range */
rt = RequestType (rt_bit);
rt_bit <<= 1;
return rt;
}
void
BaseUI::main_thread ()
{
DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: event loop running in thread %2\n", 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 ();
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 = Glib::Threads::Thread::create (mem_fun (*this, &BaseUI::main_thread));
_running.wait (_run_lock);
}
void
BaseUI::quit ()
{
if (_main_loop && _main_loop->is_running()) {
_main_loop->quit ();
run_loop_thread->join ();
}
}
#ifdef WIN32
gboolean
BaseUI::_request_handler (gpointer data)
{
BaseUI* ui = static_cast<BaseUI*>(data);
return ui->request_handler ();
}
bool
BaseUI::request_handler ()
{
DEBUG_TRACE (DEBUG::EventLoop, "BaseUI::request_handler\n");
handle_ui_requests ();
// keep calling indefinitely at the timeout interval
return true;
}
#else
bool
BaseUI::request_handler (Glib::IOCondition ioc)
{
/* check the request pipe */
if (ioc & ~IO_IN) {
_main_loop->quit ();
}
if (ioc & IO_IN) {
request_channel.drain ();
/* 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, "BaseUI::request_handler\n");
handle_ui_requests ();
}
return true;
}
#endif
void
BaseUI::signal_new_request ()
{
DEBUG_TRACE (DEBUG::EventLoop, "BaseUI::signal_new_request\n");
#ifdef WIN32
// handled in timeout, how to signal...?
#else
request_channel.wakeup ();
#endif
}
/**
* This method relies on the caller having already set m_context
*/
void
BaseUI::attach_request_source ()
{
DEBUG_TRACE (DEBUG::EventLoop, "BaseUI::attach_request_source\n");
#ifdef WIN32
GSource* request_source = g_timeout_source_new(200);
g_source_set_callback (request_source, &BaseUI::_request_handler, this, NULL);
g_source_attach (request_source, m_context->gobj());
#else
request_channel.ios()->attach (m_context);
/* glibmm hack - drop the refptr to the IOSource now before it can hurt */
request_channel.drop_ios ();
#endif
}