+ volatile bool searching;
+ volatile bool exit;
+};
+
+
+/// MainThread and TimerThread are sublassed from Thread to charaterize the two
+/// special threads: the main one and the recurring timer.
+
+struct MainThread : public Thread {
+ MainThread() : thinking(true) {} // Avoid a race with start_thinking()
+ virtual void idle_loop();
+ volatile bool thinking;
+};
+
+struct TimerThread : public Thread {
+ TimerThread() : msec(0) {}
+ virtual void idle_loop();
+ int msec;