Timers: Split microsecond timers from BFD code to lib

1 files changed, 104 insertions, 0 deletions

diff --git a/lib/timer.h b/lib/timer.h
new file mode 100644
index 00000000..88c53547
--- /dev/null
+++ b/lib/timer.h
@@ -0,0 +1,104 @@
+/*
+ *	BIRD -- Timers
+ *
+ *	(c) 2013--2017 Ondrej Zajicek <santiago@crfreenet.org>
+ *	(c) 2013--2017 CZ.NIC z.s.p.o.
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_TIMER2_H_
+#define _BIRD_TIMER2_H_
+
+#include "nest/bird.h"
+#include "lib/buffer.h"
+#include "lib/resource.h"
+
+
+typedef struct timer2
+{
+  resource r;
+  void (*hook)(struct timer2 *);
+  void *data;
+
+  btime expires;			/* 0=inactive */
+  uint randomize;			/* Amount of randomization */
+  uint recurrent;			/* Timer recurrence */
+
+  int index;
+} timer2;
+
+struct timeloop
+{
+  BUFFER(timer2 *) timers;
+  btime last_time;
+  btime real_time;
+};
+
+static inline uint timers_count(struct timeloop *loop)
+{ return loop->timers.used - 1; }
+
+static inline timer2 *timers_first(struct timeloop *loop)
+{ return (loop->timers.used > 1) ? loop->timers.data[1] : NULL; }
+
+extern struct timeloop main_timeloop;
+
+btime current_time(void);
+
+timer2 *tm2_new(pool *p);
+void tm2_set(timer2 *t, btime when);
+void tm2_start(timer2 *t, btime after);
+void tm2_stop(timer2 *t);
+
+static inline int
+tm2_active(timer2 *t)
+{
+  return t->expires != 0;
+}
+
+static inline btime
+tm2_remains(timer2 *t)
+{
+  btime now = current_time();
+  return (t->expires > now) ? (t->expires - now) : 0;
+}
+
+static inline timer2 *
+tm2_new_init(pool *p, void (*hook)(struct timer2 *), void *data, uint rec, uint rand)
+{
+  timer2 *t = tm2_new(p);
+  t->hook = hook;
+  t->data = data;
+  t->recurrent = rec;
+  t->randomize = rand;
+  return t;
+}
+
+static inline void
+tm2_set_max(timer2 *t, btime when)
+{
+  if (when > t->expires)
+    tm2_set(t, when);
+}
+
+/*
+static inline void
+tm2_start_max(timer2 *t, btime after)
+{
+  btime rem = tm2_remains(t);
+  tm2_start(t, MAX_(rem, after));
+}
+*/
+
+/* In sysdep code */
+void times_init(struct timeloop *loop);
+void times_update(struct timeloop *loop);
+
+/* For I/O loop */
+void timers_init(struct timeloop *loop, pool *p);
+void timers_fire(struct timeloop *loop);
+
+void timer_init(void);
+
+
+#endif