First checkin of the Python XPCOM bindings.

git-svn-id: svn://10.0.0.236/trunk@87331 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/extensions/python/xpcom/src/PyGWeakReference.cpp

@@ -0,0 +1,51 @@
+/* Copyright (c) 2000-2001 ActiveState Tool Corporation.
+   See the file LICENSE.txt for licensing information. */
+
+// PyGWeakReference - implements weak references for gateways.
+//
+// This code is part of the XPCOM extensions for Python.
+//
+// Written November 2000 by Mark Hammond.
+//
+// Based heavily on the Python COM support, which is
+// (c) Mark Hammond and Greg Stein.
+//
+// (c) 2000, ActiveState corp.
+
+#include "PyXPCOM_std.h"
+
+PyXPCOM_GatewayWeakReference::PyXPCOM_GatewayWeakReference( PyG_Base *base )
+{
+	m_pBase = base;
+	NS_INIT_REFCNT();
+}
+
+PyXPCOM_GatewayWeakReference::~PyXPCOM_GatewayWeakReference()
+{
+	// Simply zap my reference to the gateway!
+	// No need to zap my gateway's reference to me, as
+	// it already holds a reference, so if we are destructing,
+	// then it can't possibly hold one.
+	m_pBase = NULL;
+}
+
+NS_IMPL_THREADSAFE_ADDREF(PyXPCOM_GatewayWeakReference);
+NS_IMPL_THREADSAFE_RELEASE(PyXPCOM_GatewayWeakReference);
+NS_IMPL_THREADSAFE_QUERY_INTERFACE(PyXPCOM_GatewayWeakReference, NS_GET_IID(nsIWeakReference));
+
+NS_IMETHODIMP
+PyXPCOM_GatewayWeakReference::QueryReferent(REFNSIID iid, void * *ret)
+{
+	{ 
+	// Temp scope for lock.  We can't hold the lock during
+	// a QI, as this may itself need the lock.
+	// Make sure our object isn't dieing right now on another thread.
+	CEnterLeaveXPCOMFramework _celf;
+	if (m_pBase == NULL)
+		return NS_ERROR_NULL_POINTER;
+	m_pBase->AddRef(); // Can't die while we have a ref.
+	} // end of lock scope - lock unlocked.
+	nsresult nr = m_pBase->QueryInterface(iid, ret);
+	m_pBase->Release();
+	return nr;
+}