diff -r 000000000000 -r 6474c204b198 ipc/ipdl/test/cxx/TestRacyUndefer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/ipdl/test/cxx/TestRacyUndefer.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,115 @@
+#include "base/basictypes.h"
+
+#include "TestRacyUndefer.h"
+
+#include "IPDLUnitTests.h"      // fail etc.
+
+namespace mozilla {
+namespace _ipdltest {
+
+//-----------------------------------------------------------------------------
+// parent
+
+TestRacyUndeferParent::TestRacyUndeferParent()
+{
+    MOZ_COUNT_CTOR(TestRacyUndeferParent);
+}
+
+TestRacyUndeferParent::~TestRacyUndeferParent()
+{
+    MOZ_COUNT_DTOR(TestRacyUndeferParent);
+}
+
+void
+TestRacyUndeferParent::Main()
+{
+    if (!SendStart())
+        fail("sending Start");
+}
+
+bool
+TestRacyUndeferParent::AnswerSpam()
+{
+    static bool spammed = false;
+    static bool raced = false;
+    if (!spammed) {
+        spammed = true;
+
+        if (!SendAwakenSpam())
+            fail("sending AwakenSpam");
+    }
+    else if (!raced) {
+        raced = true;
+
+        if (!SendAwakenRaceWinTwice())
+            fail("sending WinRaceTwice");
+
+        if (!CallRace())
+            fail("calling Race1");
+    }
+    return true;
+}
+
+bool
+TestRacyUndeferParent::AnswerRaceWinTwice()
+{
+    return true;
+}
+
+bool
+TestRacyUndeferParent::RecvDone()
+{
+    Close();
+    return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// child
+
+TestRacyUndeferChild::TestRacyUndeferChild()
+{
+    MOZ_COUNT_CTOR(TestRacyUndeferChild);
+}
+
+TestRacyUndeferChild::~TestRacyUndeferChild()
+{
+    MOZ_COUNT_DTOR(TestRacyUndeferChild);
+}
+
+bool
+TestRacyUndeferChild::RecvStart()
+{
+    if (!CallSpam())
+        fail("calling Spam");
+
+    if (!SendDone())
+        fail("sending Done");
+
+    return true;
+}
+
+bool
+TestRacyUndeferChild::RecvAwakenSpam()
+{
+    if (!CallSpam())
+        fail("calling Spam");
+    return true;
+}
+
+bool
+TestRacyUndeferChild::RecvAwakenRaceWinTwice()
+{
+    if (!CallRaceWinTwice())
+        fail("calling RaceWinTwice");
+    return true;
+}
+
+bool
+TestRacyUndeferChild::AnswerRace()
+{
+    return true;
+}
+
+} // namespace _ipdltest
+} // namespace mozilla