diff -r 000000000000 -r 6474c204b198 ipc/ipdl/test/cxx/TestRacyReentry.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/ipdl/test/cxx/TestRacyReentry.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+#include "TestRacyReentry.h"
+
+#include "IPDLUnitTests.h"      // fail etc.
+
+namespace mozilla {
+namespace _ipdltest {
+
+//-----------------------------------------------------------------------------
+// parent
+
+TestRacyReentryParent::TestRacyReentryParent() : mRecvdE(false)
+{
+    MOZ_COUNT_CTOR(TestRacyReentryParent);
+}
+
+TestRacyReentryParent::~TestRacyReentryParent()
+{
+    MOZ_COUNT_DTOR(TestRacyReentryParent);
+}
+
+void
+TestRacyReentryParent::Main()
+{
+    if (!SendStart())
+        fail("sending Start");
+
+    if (!SendN())
+        fail("sending N");
+}
+
+bool
+TestRacyReentryParent::AnswerE()
+{
+    if (!mRecvdE) {
+        mRecvdE = true;
+        return true;
+    }
+
+    if (!CallH())
+        fail("calling H");
+
+    return true;
+}
+
+//-----------------------------------------------------------------------------
+// child
+
+TestRacyReentryChild::TestRacyReentryChild()
+{
+    MOZ_COUNT_CTOR(TestRacyReentryChild);
+}
+
+TestRacyReentryChild::~TestRacyReentryChild()
+{
+    MOZ_COUNT_DTOR(TestRacyReentryChild);
+}
+
+bool
+TestRacyReentryChild::RecvStart()
+{
+    if (!CallE())
+        fail("calling E");
+
+    Close();
+
+    return true;
+}
+
+bool
+TestRacyReentryChild::RecvN()
+{
+    if (!CallE())
+        fail("calling E");
+    return true;
+}
+
+bool
+TestRacyReentryChild::AnswerH()
+{
+    return true;
+}
+
+} // namespace _ipdltest
+} // namespace mozilla