From 56f4e1513e9bd3efa3afb9061a8252fbd38933ee Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 11 Sep 2014 12:00:35 -0400
Subject: provide compile-time-enabled/disabled debugging of connections being
 made to PBD::Signal via PBD::SignalBase::set_debug_connection()

---
 libs/pbd/pbd/signals.h  | 14 ++++++++++++++
 libs/pbd/pbd/signals.py |  5 +++++
 2 files changed, 19 insertions(+)

(limited to 'libs/pbd')

diff --git a/libs/pbd/pbd/signals.h b/libs/pbd/pbd/signals.h
index 672dc66850..ef53770613 100644
--- a/libs/pbd/pbd/signals.h
+++ b/libs/pbd/pbd/signals.h
@@ -39,6 +39,13 @@
 #include "pbd/libpbd_visibility.h"
 #include "pbd/event_loop.h"
 
+#define DEBUG_PBD_SIGNAL_CONNECTIONS
+
+#ifdef DEBUG_PBD_SIGNAL_CONNECTIONS
+#include "pbd/stacktrace.h"
+#include <iostream>
+#endif
+
 namespace PBD {
 
 class LIBPBD_API Connection;
@@ -46,11 +53,18 @@ class LIBPBD_API Connection;
 class LIBPBD_API SignalBase
 {
 public:
+	SignalBase () : _debug_connection (false) {}
 	virtual ~SignalBase () {}
 	virtual void disconnect (boost::shared_ptr<Connection>) = 0;
+#ifdef DEBUG_PBD_SIGNAL_CONNECTIONS
+	void set_debug_connection (bool yn) { _debug_connection = yn; }
+#endif
 
 protected:
         Glib::Threads::Mutex _mutex;
+#ifdef DEBUG_PBD_SIGNAL_CONNECTIONS
+	bool _debug_connection;
+#endif
 };
 
 class LIBPBD_API Connection : public boost::enable_shared_from_this<Connection>
diff --git a/libs/pbd/pbd/signals.py b/libs/pbd/pbd/signals.py
index 24640fca72..caf3128bfa 100644
--- a/libs/pbd/pbd/signals.py
+++ b/libs/pbd/pbd/signals.py
@@ -286,6 +286,11 @@ def signal(f, n, v):
     print("""
 	boost::shared_ptr<Connection> _connect (slot_function_type f)
 	{
+#ifdef DEBUG_PBD_SIGNAL_CONNECTIONS
+                if (_debug_connection) {
+                        PBD::stacktrace (std::cerr, 10);
+                }
+#endif
 		boost::shared_ptr<Connection> c (new Connection (this));
 		Glib::Threads::Mutex::Lock lm (_mutex);
 		_slots[c] = f;
-- 
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