From 4e41b74b9d21768a96f51254ed346d04bb4405af Mon Sep 17 00:00:00 2001
From: amurai <amurai@FreeBSD.org>
Date: Sat, 11 Mar 1995 15:18:55 +0000
Subject: 1.Reducing cpu usage at off connection. 2.Implment Redail function as
 working correctly. 3.Clean up a code as I notice. 4.Now, RTT getting close to
 50ms with ISDN/TA 38400bps !!

Reviewed by:	amurai@spec.co.jp
Submitted by:	amurai@spec.co.jp
---
 usr.sbin/ppp/timer.c | 42 +++++++++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 9 deletions(-)

(limited to 'usr.sbin/ppp/timer.c')

diff --git a/usr.sbin/ppp/timer.c b/usr.sbin/ppp/timer.c
index 3792103..b91fbcd 100644
--- a/usr.sbin/ppp/timer.c
+++ b/usr.sbin/ppp/timer.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id:$
+ * $Id: timer.c,v 1.2 1995/02/26 12:18:01 amurai Exp $
  * 
  *  TODO:
  */
@@ -85,8 +85,10 @@ struct pppTimer *tp;
   tp->next = t;
   if (pt) {
     pt->next = tp;
-  } else
+  } else {
+    InitTimerService();
     TimerList = tp;
+  }
   if (t)
     t->rest -= tp->rest;
 
@@ -120,10 +122,13 @@ struct pppTimer *tp;
   for (t = TimerList; t != tp && t !=NULL ; t = t->next)
     pt = t;
   if (t) {
-    if (pt)
+    if (pt) {
       pt->next = t->next;
-    else
+    } else {
       TimerList = t->next;
+      if ( TimerList == NULL )			/* Last one ? */
+	 TermTimerService();			/* Terminate Timer Service */
+    }
     if (t->next)
       t->next->rest += tp->rest;
   } else {
@@ -160,6 +165,8 @@ TimerService()
       } while (tp && (tp->rest == 0));
 
       TimerList = tp;
+      if ( TimerList == NULL )			/* No timers ? */
+	 TermTimerService();			/* Terminate Timer Service */
 #ifdef DEBUG
       logprintf("TimerService: next is %x(%d)\n",
 		TimerList, TimerList? TimerList->rest : 0);
@@ -222,9 +229,6 @@ u_int sleep( u_int sec )
        /* Calculate timeout value for select */
        to.tv_sec  = sld / 1000000;
        to.tv_usec = sld % 1000000;
-
-       /* Forwarding signal as normal */
-       kill(getpid(), SIGALRM);
     }
   }
 }
@@ -255,9 +259,29 @@ void usleep( u_int usec)
        to.tv_sec  = sld / 1000000;
        to.tv_usec = sld % 1000000;
 
-       /* Forwarding signal as normal */
-       kill(getpid(), SIGALRM);
     }
   }
 }
+
+void InitTimerService( void ) {
+  struct itimerval itimer;
+
+  signal(SIGALRM, (void (*)(int))TimerService);
+  itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0;
+  itimer.it_interval.tv_usec = itimer.it_value.tv_usec = TICKUNIT;
+  setitimer(ITIMER_REAL, &itimer, NULL);
+}
+
+void TermTimerService( void ) {
+  struct itimerval itimer;
+
+  itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0;
+  itimer.it_value.tv_usec = itimer.it_value.tv_sec = 0;
+  setitimer(ITIMER_REAL, &itimer, NULL);
+  /*
+   * Notes: after disabling timer here, we will get one
+   *        SIGALRM will be got.
+   */
+  signal(SIGALRM, SIG_IGN);
+}
 #endif
-- 
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