From 47246db7e9d71ba694b719001033fba1766a58c4 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 10 Jun 2006 02:43:54 +0000
Subject: More juggling

git-svn-id: http://svn.drobilla.net/lad/grauph@16 a436a847-0d15-0410-975c-d299462d15a1
---
 src/libs/client/ThreadedSigClientInterface.cpp | 71 ++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/libs/client/ThreadedSigClientInterface.cpp

(limited to 'src/libs/client/ThreadedSigClientInterface.cpp')

diff --git a/src/libs/client/ThreadedSigClientInterface.cpp b/src/libs/client/ThreadedSigClientInterface.cpp
new file mode 100644
index 00000000..860d91f6
--- /dev/null
+++ b/src/libs/client/ThreadedSigClientInterface.cpp
@@ -0,0 +1,71 @@
+/* This file is part of Om. Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om 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.
+ * 
+ * Om 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "ThreadedSigClientInterface.h"
+#include <iostream>
+using std::cerr; using std::endl;
+
+namespace LibOmClient {
+
+
+/** Push an event (from the engine, ie 'new patch') on to the queue.
+ */
+void
+ThreadedSigClientInterface::push_sig(Closure ev)
+{
+	cerr << "-- pushing event\n";
+
+	bool success = false;
+	bool first   = true;
+	
+	// (Very) slow busy-wait if the queue is full
+	// FIXME: Make this wait on a signal from process_sigs iff this happens
+	while (!success) {
+		success = _sigs.push(ev);
+		if (!success) {
+			if (first) {
+				cerr << "[ThreadedSigClientInterface] WARNING:  (Client) event queue full.  Waiting to try again..." << endl;
+				first = false;
+			}
+			usleep(200000); // 100 milliseconds (2* rate process_sigs is called)
+		}
+	}
+}
+
+
+/** Process all queued events that came from the OSC thread.
+ *
+ * This function should be called from the Gtk thread to emit signals and cause
+ * the connected methods to execute.
+ */
+bool
+ThreadedSigClientInterface::emit_signals()
+{
+	// Process a maximum of queue-size events, to prevent locking the GTK
+	// thread indefinitely while processing continually arriving events
+	size_t num_processed = 0;
+	while (!_sigs.is_empty() && num_processed++ < _sigs.capacity()/2) {
+		cerr << "-- emitting event\n";
+		Closure& ev = _sigs.pop();
+		ev();
+		ev.disconnect();
+	}
+
+	return true;
+}
+
+
+} // namespace LibOmClient
-- 
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