Handle wraparound of PRIntervalTime, plus crucial fixes thanks to Ere Maijala <ere@atp.fi> (138791, r=rjesup, sr=waterson).

git-svn-id: svn://10.0.0.236/trunk@119866 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/xpcom/threads/TimerThread.h

@@ -75,7 +75,9 @@ public:
   nsCOMPtr<nsIEventQueueService> mEventQueueService;
 
 private:
-  // These two internal functions must be called from within a lock
+  // These two internal helper methods must be called while mLock is held.
+  // AddTimerInternal returns the position where the timer was added in the
+  // list, or -1 if it failed.
   PRInt32 AddTimerInternal(nsTimerImpl *aTimer);
   PRBool  RemoveTimerInternal(nsTimerImpl *aTimer);