#ifndef TICKER_H
#define TICKER_H
+#pragma GCC visibility push(hidden)
+
typedef void (*TickProc)(int);
-extern void initTicker (nat ms, TickProc handle_tick);
-extern void startTicker (void);
-extern void stopTicker (void);
-extern void exitTicker (void);
+void initTicker (nat ms, TickProc handle_tick);
+void startTicker (void);
+void stopTicker (void);
+void exitTicker (void);
+
+#pragma GCC visibility pop
#endif /* TICKER_H */