From 9935b950eee30183d17c44ae822146acc3886915 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <carl@carlh.net>
Date: Fri, 2 Jan 2009 19:38:43 +0000
Subject: [PATCH] Ports say when they're going away.

git-svn-id: svn://localhost/ardour2/branches/3.0@4380 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/ardour/port.h |  7 ++++++-
 libs/ardour/port.cc       | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/ardour/port.h b/libs/ardour/ardour/port.h
index ad81d6763f..6bd607c334 100644
--- a/libs/ardour/ardour/port.h
+++ b/libs/ardour/ardour/port.h
@@ -26,6 +26,7 @@
 #include <cstring>
 #include <sigc++/signal.h>
 #include <pbd/failed_constructor.h>
+#include <pbd/destructible.h>
 #include <ardour/ardour.h>
 #include <ardour/data_type.h>
 #include <jack/jack.h>
@@ -37,7 +38,7 @@ class Buffer;
 
 /** Abstract base for ports
  */
-class Port : public virtual sigc::trackable {
+class Port : public virtual PBD::Destructible {
    public:
 	enum Flags {
 		IsInput = JackPortIsInput,
@@ -132,6 +133,10 @@ class Port : public virtual sigc::trackable {
 	std::set<Port*> _connections;
 
 	static AudioEngine* engine;
+
+   private:
+
+        void port_going_away (Port *);
 };
 
 class PortConnectableByName {
diff --git a/libs/ardour/port.cc b/libs/ardour/port.cc
index 7aadb9183f..f3e0739e83 100644
--- a/libs/ardour/port.cc
+++ b/libs/ardour/port.cc
@@ -34,6 +34,7 @@ Port::Port (const std::string& name, Flags flgs)
 
 Port::~Port ()
 {
+	drop_references ();
 	disconnect_all ();
 }
 
@@ -59,6 +60,7 @@ Port::connect (Port& other)
 	result = _connections.insert (&other);
 
 	if (result.second) {
+		other.GoingAway.connect (sigc::bind (mem_fun (*this, &Port::port_going_away), &other));
 		return 0;
 	} else {
 		return 1;
@@ -131,6 +133,14 @@ Port::get_connections (vector<string>& names) const
 	return i;
 }
 
+void
+Port::port_going_away (Port* p)
+{
+	/* caller must hold process lock */
+
+	disconnect (*p);
+}
+
 
 //-------------------------------------
 
@@ -377,3 +387,4 @@ PortFacade::reset ()
 		_ext_port->reset ();
 	}
 }
+
-- 
2.30.2