Control surfaces c'tor usually subscribe to signals e.g. PortConnectedOrDisconnected. This happens after the parent BaseUI is created, but before set_active() -> BaseUI::run() is called. At this point in time there is no run_loop thread. There are two options to handle AbstractUI::call_slot(): A. Queue the event in the event-loop, using the thread-local request buffer of the caller. Then hope the BaseUI thread is started, and calls ::handle_ui_requests() before the memory pool runs out of space. B. Handle the event in the calling thread. -- This may not be rt-safe and may call functions with locks held by the caller. It will however not accumulate events. This takes approach (B). If _run_loop_thread is NULL, directly handle the signal. In the past, prior to50abcc74b5
, approach (A) was taken. NULL never matched Glib::Threads::Thread::self(). This also reverts a prior attempt (e417495505
) to address this issue.
180 lines
4.3 KiB
C++
180 lines
4.3 KiB
C++
/*
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* Copyright (C) 2000-2016 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2008-2009 David Robillard <d@drobilla.net>
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* Copyright (C) 2011-2012 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
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* Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <cstring>
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#include <stdint.h>
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#ifdef COMPILER_MSVC
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#include <io.h> // Microsoft's nearest equivalent to <unistd.h>
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#else
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <cerrno>
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#include <cstring>
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#include <pthread.h>
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#include <sched.h>
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#include "pbd/base_ui.h"
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#include "pbd/debug.h"
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#include "pbd/pthread_utils.h"
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#include "pbd/error.h"
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#include "pbd/compose.h"
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#include "pbd/failed_constructor.h"
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#include "pbd/i18n.h"
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#include "pbd/debug.h"
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using namespace std;
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using namespace PBD;
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using namespace Glib;
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uint64_t BaseUI::rt_bit = 1;
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int BaseUI::_thread_priority = PBD_RT_PRI_PROC - 1;
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BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
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BaseUI::RequestType BaseUI::Quit = BaseUI::new_request_type();
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BaseUI::BaseUI (const string& loop_name)
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: EventLoop (loop_name)
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, m_context(MainContext::get_default())
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, _run_loop_thread (0)
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, request_channel (true)
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{
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base_ui_instance = this;
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request_channel.set_receive_handler (sigc::mem_fun (*this, &BaseUI::request_handler));
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/* derived class must set _ok */
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}
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BaseUI::~BaseUI()
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{
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delete _run_loop_thread;
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}
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BaseUI::RequestType
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BaseUI::new_request_type ()
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{
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RequestType rt;
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/* XXX catch out-of-range */
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rt = RequestType (rt_bit);
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rt_bit <<= 1;
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return rt;
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}
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int
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BaseUI::set_thread_priority () const
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{
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return pbd_set_thread_priority (pthread_self(), PBD_SCHED_FIFO, _thread_priority);
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}
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void
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BaseUI::main_thread ()
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{
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pthread_set_name (string_compose ("UI:%1", event_loop_name ()).c_str ());
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DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: event loop running in thread %2\n", event_loop_name(), pthread_name()));
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set_event_loop_for_thread (this);
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thread_init ();
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_main_loop->get_context()->signal_idle().connect (sigc::mem_fun (*this, &BaseUI::signal_running));
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_main_loop->run ();
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}
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bool
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BaseUI::signal_running ()
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{
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Glib::Threads::Mutex::Lock lm (_run_lock);
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_running.signal ();
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return false; // don't call it again
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}
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void
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BaseUI::run ()
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{
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/* to be called by UI's that need/want their own distinct, self-created event loop thread.
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*/
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m_context = MainContext::create();
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_main_loop = MainLoop::create (m_context);
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attach_request_source ();
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Glib::Threads::Mutex::Lock lm (_run_lock);
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_run_loop_thread = PBD::Thread::create (boost::bind (&BaseUI::main_thread, this));
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_running.wait (_run_lock);
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}
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void
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BaseUI::quit ()
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{
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if (_main_loop && _main_loop->is_running()) {
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_main_loop->quit ();
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_run_loop_thread->join ();
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}
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}
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bool
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BaseUI::request_handler (Glib::IOCondition ioc)
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{
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/* check the request pipe */
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if (ioc & IO_IN) {
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request_channel.drain ();
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/* there may been an error. we'd rather handle requests first,
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and then get IO_HUP or IO_ERR on the next loop.
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*/
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/* handle requests */
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DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: request handler\n", event_loop_name()));
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handle_ui_requests ();
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}
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if (ioc & ~(IO_IN|IO_PRI)) {
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_main_loop->quit ();
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}
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return true;
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}
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void
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BaseUI::signal_new_request ()
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{
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DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: signal_new_request\n", event_loop_name()));
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request_channel.wakeup ();
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}
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/**
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* This method relies on the caller having already set m_context
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*/
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void
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BaseUI::attach_request_source ()
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{
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DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: attach request source\n", event_loop_name()));
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request_channel.attach (m_context);
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}
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