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authorDavid Robillard <d@drobilla.net>2011-04-20 16:26:40 +0000
committerDavid Robillard <d@drobilla.net>2011-04-20 16:26:40 +0000
commit138a87e915ad3aff184730415105f94c874174bf (patch)
tree0d942bdddfdbcc3d969b4fce5592e770ab851b86 /src/server/EventSource.cpp
parent1f1758f4dda0ddaf01c0b1d3a756f9db8ddc979d (diff)
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Rename Ingen::Engine to Ingen::Server (hopefully avoid odd name clases and fix #675).
git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@3184 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'src/server/EventSource.cpp')
-rw-r--r--src/server/EventSource.cpp127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/server/EventSource.cpp b/src/server/EventSource.cpp
new file mode 100644
index 00000000..273a4693
--- /dev/null
+++ b/src/server/EventSource.cpp
@@ -0,0 +1,127 @@
+/* This file is part of Ingen.
+ * Copyright 2008-2011 David Robillard <http://drobilla.net>
+ *
+ * Ingen 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.
+ *
+ * Ingen 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <sys/mman.h>
+#include "EventSource.hpp"
+#include "QueuedEvent.hpp"
+#include "PostProcessor.hpp"
+#include "ThreadManager.hpp"
+#include "ProcessContext.hpp"
+
+using namespace std;
+
+namespace Ingen {
+namespace Server {
+
+EventSource::EventSource(size_t queue_size)
+ : _blocking_semaphore(0)
+{
+ Thread::set_context(THREAD_PRE_PROCESS);
+ set_name("EventSource");
+}
+
+EventSource::~EventSource()
+{
+ Thread::stop();
+}
+
+/** Push an unprepared event onto the queue.
+ */
+void
+EventSource::push_queued(QueuedEvent* const ev)
+{
+ assert(!ev->is_prepared());
+ Raul::List<Event*>::Node* node = new Raul::List<Event*>::Node(ev);
+ _events.push_back(node);
+ if (_prepared_back.get() == NULL)
+ _prepared_back = node;
+
+ whip();
+}
+
+/** Process all events for a cycle.
+ *
+ * Executed events will be pushed to @a dest.
+ */
+void
+EventSource::process(PostProcessor& dest, ProcessContext& context, bool limit)
+{
+ ThreadManager::assert_thread(THREAD_PROCESS);
+
+ if (_events.empty())
+ return;
+
+ /* Limit the maximum number of queued events to process per cycle. This
+ * makes the process callback (more) realtime-safe by preventing being
+ * choked by events coming in faster than they can be processed.
+ * FIXME: test this and figure out a good value */
+ const size_t MAX_QUEUED_EVENTS = context.nframes() / 32;
+
+ size_t num_events_processed = 0;
+
+ Raul::List<Event*>::Node* head = _events.head();
+ Raul::List<Event*>::Node* tail = head;
+
+ if (!head)
+ return;
+
+ QueuedEvent* ev = (QueuedEvent*)head->elem();
+
+ while (ev && ev->is_prepared() && ev->time() < context.end()) {
+ ev->execute(context);
+ tail = head;
+ head = head->next();
+ ++num_events_processed;
+ if (limit && num_events_processed > MAX_QUEUED_EVENTS)
+ break;
+ ev = (head ? (QueuedEvent*)head->elem() : NULL);
+ }
+
+ if (num_events_processed > 0) {
+ Raul::List<Event*> front;
+ _events.chop_front(front, num_events_processed, tail);
+ dest.append(&front);
+ }
+}
+
+/** Pre-process a single event */
+void
+EventSource::_whipped()
+{
+ Raul::List<Event*>::Node* pb = _prepared_back.get();
+ if (!pb)
+ return;
+
+ QueuedEvent* const ev = (QueuedEvent*)pb->elem();
+ assert(ev);
+
+ assert(!ev->is_prepared());
+ ev->pre_process();
+ assert(ev->is_prepared());
+
+ assert(_prepared_back.get() == pb);
+ _prepared_back = pb->next();
+
+ // If event was blocking, wait for event to being run through the
+ // process thread before preparing the next event
+ if (ev->is_blocking())
+ _blocking_semaphore.wait();
+}
+
+} // namespace Server
+} // namespace Ingen
+