When compiled for debugging warn if a thread calls idle() holding mutex locks.

git-svn-id: http://yate.null.ro/svn/yate/trunk@2831 acf43c95-373e-0410-b603-e72c3f656dc1

engine/Thread.cpp

@@ -653,6 +653,12 @@ void Thread::yield(bool exitCheck)
 
 void Thread::idle(bool exitCheck)
 {
+#ifdef DEBUG
+    const Thread* t = Thread::current();
+    if (t && t->locked())
+	Debug(DebugMild,"Thread '%s' idling with %d mutex locks held [%p]",
+	    t->name(),t->locks(),t);
+#endif
     msleep(THREAD_IDLE_MSEC,exitCheck);
 }