580 lines
17 KiB
C++
580 lines
17 KiB
C++
/*
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Copyright (C) 2010 Paul Davis
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Author: Torben Hohn
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <cmath>
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#include "pbd/compose.h"
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#include "pbd/debug_rt_alloc.h"
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#include "pbd/pthread_utils.h"
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#include "ardour/debug.h"
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#include "ardour/graph.h"
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#include "ardour/types.h"
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#include "ardour/session.h"
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#include "ardour/route.h"
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#include "ardour/process_thread.h"
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#include "ardour/audioengine.h"
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#include "i18n.h"
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using namespace ARDOUR;
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using namespace PBD;
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using namespace std;
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#ifdef DEBUG_RT_ALLOC
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static Graph* graph = 0;
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extern "C" {
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int alloc_allowed ()
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{
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return !graph->in_process_thread ();
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}
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}
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#endif
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Graph::Graph (Session & session)
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: SessionHandleRef (session)
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, _quit_threads (false)
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, _execution_sem ("graph_execution", 0)
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, _callback_start_sem ("graph_start", 0)
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, _callback_done_sem ("graph_done", 0)
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, _cleanup_sem ("graph_cleanup", 0)
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{
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pthread_mutex_init( &_trigger_mutex, NULL);
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/* XXX: rather hacky `fix' to stop _trigger_queue.push_back() allocating
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memory in the RT thread.
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*/
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_trigger_queue.reserve (8192);
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_execution_tokens = 0;
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_current_chain = 0;
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_pending_chain = 0;
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_setup_chain = 1;
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_quit_threads = false;
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_graph_empty = true;
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reset_thread_list ();
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#ifdef DEBUG_RT_ALLOC
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graph = this;
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pbd_alloc_allowed = &::alloc_allowed;
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#endif
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}
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/** Set up threads for running the graph */
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void
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Graph::reset_thread_list ()
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{
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uint32_t num_threads = how_many_dsp_threads ();
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/* For now, we shouldn't be using the graph code if we only have 1 DSP thread */
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assert (num_threads > 1);
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/* don't bother doing anything here if we already have the right
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number of threads.
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*/
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if (AudioEngine::instance()->process_thread_count() == num_threads) {
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return;
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}
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Glib::Threads::Mutex::Lock lm (_session.engine().process_lock());
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if (AudioEngine::instance()->process_thread_count() != 0) {
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drop_threads ();
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}
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if (AudioEngine::instance()->create_process_thread (boost::bind (&Graph::main_thread, this)) != 0) {
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throw failed_constructor ();
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}
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for (uint32_t i = 1; i < num_threads; ++i) {
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if (AudioEngine::instance()->create_process_thread (boost::bind (&Graph::helper_thread, this))) {
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throw failed_constructor ();
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}
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}
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}
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void
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Graph::session_going_away()
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{
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drop_threads ();
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// now drop all references on the nodes.
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_nodes_rt[0].clear();
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_nodes_rt[1].clear();
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_init_trigger_list[0].clear();
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_init_trigger_list[1].clear();
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_trigger_queue.clear();
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}
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void
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Graph::drop_threads ()
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{
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_quit_threads = true;
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uint32_t thread_count = AudioEngine::instance()->process_thread_count ();
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for (unsigned int i=0; i < thread_count; i++) {
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_execution_sem.signal ();
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}
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_callback_start_sem.signal ();
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AudioEngine::instance()->join_process_threads ();
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_execution_tokens = 0;
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_quit_threads = false;
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}
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void
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Graph::clear_other_chain ()
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{
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Glib::Threads::Mutex::Lock ls (_swap_mutex);
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while (1) {
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if (_setup_chain != _pending_chain) {
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for (node_list_t::iterator ni=_nodes_rt[_setup_chain].begin(); ni!=_nodes_rt[_setup_chain].end(); ni++) {
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(*ni)->_activation_set[_setup_chain].clear();
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}
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_nodes_rt[_setup_chain].clear ();
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_init_trigger_list[_setup_chain].clear ();
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break;
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}
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/* setup chain == pending chain - we have
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to wait till this is no longer true.
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*/
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_cleanup_cond.wait (_swap_mutex);
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}
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}
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void
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Graph::prep()
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{
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node_list_t::iterator i;
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int chain;
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if (_swap_mutex.trylock()) {
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// we got the swap mutex.
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if (_current_chain != _pending_chain)
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{
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// printf ("chain swap ! %d -> %d\n", _current_chain, _pending_chain);
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_setup_chain = _current_chain;
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_current_chain = _pending_chain;
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_cleanup_cond.signal ();
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}
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_swap_mutex.unlock ();
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}
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chain = _current_chain;
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_graph_empty = true;
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for (i=_nodes_rt[chain].begin(); i!=_nodes_rt[chain].end(); i++) {
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(*i)->prep( chain);
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_graph_empty = false;
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}
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_finished_refcount = _init_finished_refcount[chain];
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/* Trigger the initial nodes for processing, which are the ones at the `input' end */
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pthread_mutex_lock (&_trigger_mutex);
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for (i=_init_trigger_list[chain].begin(); i!=_init_trigger_list[chain].end(); i++) {
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/* don't use ::trigger here, as we have already locked the mutex */
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_trigger_queue.push_back (i->get ());
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}
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pthread_mutex_unlock (&_trigger_mutex);
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}
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void
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Graph::trigger (GraphNode* n)
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{
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pthread_mutex_lock (&_trigger_mutex);
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_trigger_queue.push_back (n);
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pthread_mutex_unlock (&_trigger_mutex);
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}
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/** Called when a node at the `output' end of the chain (ie one that has no-one to feed)
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* is finished.
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*/
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void
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Graph::dec_ref()
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{
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if (g_atomic_int_dec_and_test (const_cast<gint*> (&_finished_refcount))) {
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/* We have run all the nodes that are at the `output' end of
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the graph, so there is nothing more to do this time around.
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*/
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restart_cycle ();
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}
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}
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void
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Graph::restart_cycle()
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{
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// we are through. wakeup our caller.
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again:
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_callback_done_sem.signal ();
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/* Block until the a process callback triggers us */
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_callback_start_sem.wait();
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if (_quit_threads) {
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return;
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}
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prep ();
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if (_graph_empty) {
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goto again;
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}
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// returning will restart the cycle.
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// starting with waking up the others.
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}
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/** Rechain our stuff using a list of routes (which can be in any order) and
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* a directed graph of their interconnections, which is guaranteed to be
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* acyclic.
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*/
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void
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Graph::rechain (boost::shared_ptr<RouteList> routelist, GraphEdges const & edges)
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{
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Glib::Threads::Mutex::Lock ls (_swap_mutex);
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int chain = _setup_chain;
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DEBUG_TRACE (DEBUG::Graph, string_compose ("============== setup %1\n", chain));
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/* This will become the number of nodes that do not feed any other node;
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once we have processed this number of those nodes, we have finished.
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*/
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_init_finished_refcount[chain] = 0;
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/* This will become a list of nodes that are not fed by another node, ie
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those at the `input' end.
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*/
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_init_trigger_list[chain].clear();
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_nodes_rt[chain].clear();
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/* Clear things out, and make _nodes_rt[chain] a copy of routelist */
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for (RouteList::iterator ri=routelist->begin(); ri!=routelist->end(); ri++) {
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(*ri)->_init_refcount[chain] = 0;
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(*ri)->_activation_set[chain].clear();
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_nodes_rt[chain].push_back (*ri);
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}
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// now add refs for the connections.
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for (node_list_t::iterator ni = _nodes_rt[chain].begin(); ni != _nodes_rt[chain].end(); ni++) {
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boost::shared_ptr<Route> r = boost::dynamic_pointer_cast<Route> (*ni);
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/* The routes that are directly fed by r */
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set<GraphVertex> fed_from_r = edges.from (r);
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/* Hence whether r has an output */
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bool const has_output = !fed_from_r.empty ();
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/* Set up r's activation set */
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for (set<GraphVertex>::iterator i = fed_from_r.begin(); i != fed_from_r.end(); ++i) {
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r->_activation_set[chain].insert (*i);
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}
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/* r has an input if there are some incoming edges to r in the graph */
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bool const has_input = !edges.has_none_to (r);
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/* Increment the refcount of any route that we directly feed */
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for (node_set_t::iterator ai = r->_activation_set[chain].begin(); ai != r->_activation_set[chain].end(); ai++) {
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(*ai)->_init_refcount[chain] += 1;
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}
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if (!has_input) {
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/* no input, so this node needs to be triggered initially to get things going */
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_init_trigger_list[chain].push_back (*ni);
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}
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if (!has_output) {
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/* no output, so this is one of the nodes that we can count off to decide
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if we've finished
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*/
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_init_finished_refcount[chain] += 1;
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}
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}
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_pending_chain = chain;
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dump(chain);
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}
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/** Called by both the main thread and all helpers.
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* @return true to quit, false to carry on.
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*/
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bool
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Graph::run_one()
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{
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GraphNode* to_run;
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pthread_mutex_lock (&_trigger_mutex);
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if (_trigger_queue.size()) {
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to_run = _trigger_queue.back();
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_trigger_queue.pop_back();
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} else {
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to_run = 0;
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}
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/* the number of threads that are asleep */
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int et = _execution_tokens;
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/* the number of nodes that need to be run */
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int ts = _trigger_queue.size();
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/* hence how many threads to wake up */
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int wakeup = min (et, ts);
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/* update the number of threads that will still be sleeping */
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_execution_tokens -= wakeup;
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DEBUG_TRACE(DEBUG::ProcessThreads, string_compose ("%1 signals %2\n", pthread_name(), wakeup));
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for (int i = 0; i < wakeup; i++) {
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_execution_sem.signal ();
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}
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while (to_run == 0) {
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_execution_tokens += 1;
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pthread_mutex_unlock (&_trigger_mutex);
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DEBUG_TRACE (DEBUG::ProcessThreads, string_compose ("%1 goes to sleep\n", pthread_name()));
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_execution_sem.wait ();
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if (_quit_threads) {
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return true;
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}
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DEBUG_TRACE (DEBUG::ProcessThreads, string_compose ("%1 is awake\n", pthread_name()));
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pthread_mutex_lock (&_trigger_mutex);
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if (_trigger_queue.size()) {
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to_run = _trigger_queue.back();
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_trigger_queue.pop_back();
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}
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}
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pthread_mutex_unlock (&_trigger_mutex);
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to_run->process();
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to_run->finish (_current_chain);
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DEBUG_TRACE(DEBUG::ProcessThreads, string_compose ("%1 has finished run_one()\n", pthread_name()));
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return false;
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}
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void
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Graph::helper_thread()
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{
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suspend_rt_malloc_checks ();
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ProcessThread* pt = new ProcessThread ();
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resume_rt_malloc_checks ();
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pt->get_buffers();
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while(1) {
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if (run_one()) {
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break;
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}
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}
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pt->drop_buffers();
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}
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/** Here's the main graph thread */
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void
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Graph::main_thread()
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{
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suspend_rt_malloc_checks ();
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ProcessThread* pt = new ProcessThread ();
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resume_rt_malloc_checks ();
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pt->get_buffers();
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again:
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_callback_start_sem.wait ();
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DEBUG_TRACE(DEBUG::ProcessThreads, "main thread is awake\n");
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if (_quit_threads) {
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return;
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}
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prep ();
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if (_graph_empty && !_quit_threads) {
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_callback_done_sem.signal ();
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DEBUG_TRACE(DEBUG::ProcessThreads, "main thread sees graph done, goes back to sleep\n");
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goto again;
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}
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/* This loop will run forever */
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while (1) {
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DEBUG_TRACE(DEBUG::ProcessThreads, "main thread runs one graph node\n");
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if (run_one()) {
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break;
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}
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}
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pt->drop_buffers();
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}
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void
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Graph::dump (int chain)
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{
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#ifndef NDEBUG
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node_list_t::iterator ni;
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node_set_t::iterator ai;
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chain = _pending_chain;
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DEBUG_TRACE (DEBUG::Graph, "--------------------------------------------Graph dump:\n");
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for (ni=_nodes_rt[chain].begin(); ni!=_nodes_rt[chain].end(); ni++) {
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boost::shared_ptr<Route> rp = boost::dynamic_pointer_cast<Route>( *ni);
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DEBUG_TRACE (DEBUG::Graph, string_compose ("GraphNode: %1 refcount: %2\n", rp->name().c_str(), (*ni)->_init_refcount[chain]));
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for (ai=(*ni)->_activation_set[chain].begin(); ai!=(*ni)->_activation_set[chain].end(); ai++) {
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DEBUG_TRACE (DEBUG::Graph, string_compose (" triggers: %1\n", boost::dynamic_pointer_cast<Route>(*ai)->name().c_str()));
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}
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}
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DEBUG_TRACE (DEBUG::Graph, "------------- trigger list:\n");
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for (ni=_init_trigger_list[chain].begin(); ni!=_init_trigger_list[chain].end(); ni++) {
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DEBUG_TRACE (DEBUG::Graph, string_compose ("GraphNode: %1 refcount: %2\n", boost::dynamic_pointer_cast<Route>(*ni)->name().c_str(), (*ni)->_init_refcount[chain]));
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}
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DEBUG_TRACE (DEBUG::Graph, string_compose ("final activation refcount: %1\n", _init_finished_refcount[chain]));
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#endif
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}
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int
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Graph::silent_process_routes (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, bool& need_butler)
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{
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_process_nframes = nframes;
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_process_start_frame = start_frame;
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_process_end_frame = end_frame;
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_process_silent = true;
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_process_noroll = false;
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_process_retval = 0;
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_process_need_butler = false;
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if (!_graph_empty) {
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DEBUG_TRACE(DEBUG::ProcessThreads, "wake graph for silent process\n");
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_callback_start_sem.signal ();
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_callback_done_sem.wait ();
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}
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need_butler = _process_need_butler;
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return _process_retval;
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}
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int
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Graph::process_routes (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, int declick, bool& need_butler)
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{
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DEBUG_TRACE (DEBUG::ProcessThreads, string_compose ("graph execution from %1 to %2 = %3\n", start_frame, end_frame, nframes));
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_process_nframes = nframes;
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_process_start_frame = start_frame;
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_process_end_frame = end_frame;
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_process_declick = declick;
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_process_silent = false;
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_process_noroll = false;
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_process_retval = 0;
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_process_need_butler = false;
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DEBUG_TRACE(DEBUG::ProcessThreads, "wake graph for non-silent process\n");
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_callback_start_sem.signal ();
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_callback_done_sem.wait ();
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DEBUG_TRACE (DEBUG::ProcessThreads, "graph execution complete\n");
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need_butler = _process_need_butler;
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return _process_retval;
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}
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int
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Graph::routes_no_roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame,
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bool non_rt_pending, int declick)
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{
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DEBUG_TRACE (DEBUG::ProcessThreads, string_compose ("no-roll graph execution from %1 to %2 = %3\n", start_frame, end_frame, nframes));
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_process_nframes = nframes;
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_process_start_frame = start_frame;
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_process_end_frame = end_frame;
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_process_declick = declick;
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_process_non_rt_pending = non_rt_pending;
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_process_silent = false;
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_process_noroll = true;
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_process_retval = 0;
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_process_need_butler = false;
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DEBUG_TRACE(DEBUG::ProcessThreads, "wake graph for no-roll process\n");
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_callback_start_sem.signal ();
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_callback_done_sem.wait ();
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return _process_retval;
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}
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void
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Graph::process_one_route (Route* route)
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{
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bool need_butler = false;
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int retval;
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assert (route);
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|
|
DEBUG_TRACE (DEBUG::ProcessThreads, string_compose ("%1 runs route %2\n", pthread_name(), route->name()));
|
|
|
|
if (_process_silent) {
|
|
retval = route->silent_roll (_process_nframes, _process_start_frame, _process_end_frame, need_butler);
|
|
} else if (_process_noroll) {
|
|
route->set_pending_declick (_process_declick);
|
|
retval = route->no_roll (_process_nframes, _process_start_frame, _process_end_frame, _process_non_rt_pending);
|
|
} else {
|
|
route->set_pending_declick (_process_declick);
|
|
retval = route->roll (_process_nframes, _process_start_frame, _process_end_frame, _process_declick, need_butler);
|
|
}
|
|
|
|
if (retval) {
|
|
_process_retval = retval;
|
|
}
|
|
|
|
if (need_butler) {
|
|
_process_need_butler = true;
|
|
}
|
|
}
|
|
|
|
bool
|
|
Graph::in_process_thread () const
|
|
{
|
|
return AudioEngine::instance()->in_process_thread ();
|
|
}
|