MT#62181 iterate list with lock held

Change-Id: I28d5e1616973e2ec6c721f61458fcc7a7a360484

core/AmThread.cpp

@@ -191,7 +191,9 @@ void AmThreadWatcher::run()
 	}
 	else {
 	  DBG("thread %lu still running.\n", cur_thread->_pid);
+          _l.lock();
 	  it++;
+          _l.unlock();
 	}
 
 	_l.lock();