From 574bad76afec8e719072cc7397ae77069c8cf542 Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Wed, 29 May 2013 00:11:03 +0000
Subject: [PATCH] [Cython] Fixed premature garbage collection of Reactor
 objects

---
 interfaces/cython/cantera/_cantera.pxd | 4 ++++
 interfaces/cython/cantera/reactor.pyx  | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/interfaces/cython/cantera/_cantera.pxd b/interfaces/cython/cantera/_cantera.pxd
index 9f68a379b..baf03ae82 100644
--- a/interfaces/cython/cantera/_cantera.pxd
+++ b/interfaces/cython/cantera/_cantera.pxd
@@ -564,9 +564,13 @@ cdef class Wall:
     cdef WallSurface right_surface
     cdef object _velocity_func
     cdef object _heat_flux_func
+    cdef ReactorBase _left_reactor
+    cdef ReactorBase _right_reactor
     cdef str name
 
 cdef class FlowDevice:
     cdef CxxFlowDevice* dev
     cdef Func1 _rate_func
     cdef str name
+    cdef ReactorBase _upstream
+    cdef ReactorBase _downstream
diff --git a/interfaces/cython/cantera/reactor.pyx b/interfaces/cython/cantera/reactor.pyx
index bc7c77744..e4b57cf95 100644
--- a/interfaces/cython/cantera/reactor.pyx
+++ b/interfaces/cython/cantera/reactor.pyx
@@ -399,6 +399,9 @@ cdef class Wall:
         left._add_wall(self)
         right._add_wall(self)
         self.wall.install(deref(left.rbase), deref(right.rbase))
+        # Keep references to prevent premature garbage collection
+        self._left_reactor = left
+        self._right_reactor = right
 
     property left:
         """ The left surface of this wall. """
@@ -532,6 +535,9 @@ cdef class FlowDevice:
         upstream._add_outlet(self)
         downstream._add_inlet(self)
         self.dev.install(deref(upstream.rbase), deref(downstream.rbase))
+        # Keep references to prevent premature garbage collection
+        self._upstream = upstream
+        self._downstream = downstream
 
     def mdot(self, double t):
         """