server/tripe.c: Formalize the interval-timer arrangements.

[tripe] / server / tripe.c

diff --git a/server/tripe.c b/server/tripe.c
index 93d40b9bb6f40130ea7807e9146a50159b7d20bf..e4733bcebf56d31cf8d616399037608d4f15f2e3 100644 (file)
--- a/server/tripe.c
+++ b/server/tripe.c
@@ -36,7 +36,10 @@ sel_state sel;
 static sel_timer it;
 #define T_INTERVAL MIN(1)
 
-/*----- Main code ---------------------------------------------------------*/
+static unsigned iv_nreasons = 0;
+static struct timeval iv_next = { 0, 0 };
+
+/*----- The interval timer ------------------------------------------------*/
 
 /* --- @interval@ --- *
  *
@@ -50,15 +53,54 @@ static sel_timer it;
 
 static void interval(struct timeval *tv, void *v)
 {
-  struct timeval tvv;
   T( trace(T_PEER, "peer: interval timer"); )
+  iv_next = *tv;
   rand_seed(RAND_GLOBAL, MAXHASHSZ);
   p_interval();
-  tvv = *tv;
-  tvv.tv_sec += T_INTERVAL;
-  sel_addtimer(&sel, &it, &tvv, interval, v);
+  iv_next.tv_sec += T_INTERVAL;
+  sel_addtimer(&sel, &it, &iv_next, interval, v);
+}
+
+/* --- @iv_addreason@ --- *
+ *
+ * Arguments:  ---
+ *
+ * Returns:    ---
+ *
+ * Use:                Adds an `interval timer reason'; if there are no others, the
+ *             interval timer is engaged.
+ */
+
+void iv_addreason(void)
+{
+  struct timeval tv;
+
+  if (!iv_nreasons) {
+    gettimeofday(&tv, 0);
+    if (TV_CMP(&tv, >=, &iv_next)) interval(&tv, 0);
+    else sel_addtimer(&sel, &it, &iv_next, interval, 0);
+  }
+  iv_nreasons++;
 }
 
+/* --- @iv_rmreason@ --- *
+ *
+ * Arguments:  ---
+ *
+ * Returns:    ---
+ *
+ * Use:                Removes an interval timer reason; if there are none left, the
+ *             interval timer is disengaged.
+ */
+
+void iv_rmreason(void)
+{
+  assert(iv_nreasons); iv_nreasons--;
+  if (!iv_nreasons) sel_rmtimer(&it);
+}
+
+/*----- Main code ---------------------------------------------------------*/
+
 /* --- @main@ --- *
  *
  * Arguments:  @int argc@ = number of command line arguments
@@ -127,7 +169,6 @@ int main(int argc, char *argv[])
   int i;
   int err, selerr = 0;
   unsigned af;
-  struct timeval tv;
   uid_t u = -1;
   gid_t g = -1;
 
@@ -331,9 +372,8 @@ int main(int argc, char *argv[])
     a_switcherr();
   }
 
-  tv.tv_sec = time(0) + T_INTERVAL;
-  tv.tv_usec = 0;
-  sel_addtimer(&sel, &it, &tv, interval, 0);
+  gettimeofday(&iv_next, 0); iv_next.tv_sec += T_INTERVAL;
+  iv_addreason();
 
   for (;;) {
     a_preselect();