Convert UCTimers to use UCoreClock

include/ucore/ucore_timers.h

@@ -9,6 +9,7 @@
 
 struct UCTimer;
 struct UCTimers;
+struct UCoreClock;
 
 //internal timer states
 enum {
@@ -62,6 +63,7 @@ struct UCTimer {
 /** Timer engine. Must be initialized onnce.*/
 struct UCTimers {
     RBTree timer_tree;
+    struct UCoreClock *uclock;
     size_t seq; //used to generate unique timers
     TAILQ_HEAD(, UCTimer) ready_list; //pending timers to be fired while inside uc_timers_run
 };
@@ -73,6 +75,12 @@ struct UCTimers {
  */
 void uc_timers_init(struct UCTimers *t);
 
+/** Initialize a timer engine for use, with a user supplied clock.
+ *
+ * @param t UCTimers struct to initialize
+ */
+void uc_timers_init_ex(struct UCTimers *t, struct UCoreClock *uclock);
+
 /** Add a (one-shot) timer to the timer engine.
  * User fills in the callback and any cookie members of the UCTimer. The callback
  * will be called when the timer expires, and the timer is removed from the engine
@@ -127,7 +135,7 @@ int uc_timer_running(const struct UCTimer *timer);
  * @return the number of timers fired, or negative if an error occured(presently no errors
  *         are possible and the return value is always >= 0
  **/
-int uc_timers_run(struct UCTimers *timers, const struct timeval *now);
+int uc_timers_run(struct UCTimers *timers);
 
 //uc_timers_destroy(struct UCTimers *timers) is currently missing..