From 5f2f95676c4b46e0c2ef3764baa2fd8c87abd238 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Fri, 5 Nov 2010 09:19:22 +0000
Subject: [PATCH] Formal shutdown interface on SGSubsystem.

---
 simgear/structure/subsystem_mgr.cxx | 22 ++++++++++++++++++++++
 simgear/structure/subsystem_mgr.hxx | 12 ++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/simgear/structure/subsystem_mgr.cxx b/simgear/structure/subsystem_mgr.cxx
index 6e4dff29..387d097a 100644
--- a/simgear/structure/subsystem_mgr.cxx
+++ b/simgear/structure/subsystem_mgr.cxx
@@ -38,6 +38,11 @@ SGSubsystem::reinit ()
 {
 }
 
+void
+SGSubsystem::shutdown ()
+{
+}
+
 void
 SGSubsystem::bind ()
 {
@@ -141,6 +146,14 @@ SGSubsystemGroup::reinit ()
         _members[i]->subsystem->reinit();
 }
 
+void
+SGSubsystemGroup::shutdown ()
+{
+    // reverse order to prevent order dependency problems
+    for (unsigned int i = _members.size(); i > 0; i--)
+        _members[i-1]->subsystem->shutdown();
+}
+
 void
 SGSubsystemGroup::bind ()
 {
@@ -420,6 +433,15 @@ SGSubsystemMgr::reinit ()
             _groups[i]->reinit();
 }
 
+void
+SGSubsystemMgr::shutdown ()
+{
+    // reverse order to prevent order dependency problems
+    for (int i = MAX_GROUPS-1; i >= 0; i--)
+        _groups[i]->shutdown();
+}
+
+
 void
 SGSubsystemMgr::bind ()
 {
diff --git a/simgear/structure/subsystem_mgr.hxx b/simgear/structure/subsystem_mgr.hxx
index b36bdb9a..c49d73fd 100644
--- a/simgear/structure/subsystem_mgr.hxx
+++ b/simgear/structure/subsystem_mgr.hxx
@@ -169,6 +169,16 @@ public:
   virtual void reinit ();
 
 
+  /**
+   * Shutdown the subsystem.
+   *
+   * <p>Release any state associated with subsystem. Shutdown happens in
+   * the reverse order to init(), so this is the correct place to do
+   * shutdown that depends on other subsystems.
+   * </p>
+   */
+  virtual void shutdown ();
+   
   /**
    * Acquire the subsystem's property bindings.
    *
@@ -297,6 +307,7 @@ public:
     virtual void init ();
     virtual void postinit ();
     virtual void reinit ();
+    virtual void shutdown ();
     virtual void bind ();
     virtual void unbind ();
     virtual void update (double delta_time_sec);
@@ -392,6 +403,7 @@ public:
     virtual void init ();
     virtual void postinit ();
     virtual void reinit ();
+    virtual void shutdown ();
     virtual void bind ();
     virtual void unbind ();
     virtual void update (double delta_time_sec);
-- 
2.39.5