From 9baff9659cdfda7b92f1bd5b5f1bea8dcdc0c6a2 Mon Sep 17 00:00:00 2001
From: ian <ian>
Date: Sat, 12 Feb 2005 21:12:16 +0000
Subject: [PATCH] wip

---
 hostside/safety.c |  8 ++++++++
 hostside/safety.h | 15 ++++++++++-----
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/hostside/safety.c b/hostside/safety.c
index a73bf2e..5969300 100644
--- a/hostside/safety.c
+++ b/hostside/safety.c
@@ -6,6 +6,14 @@
 
 State safety_actual;
 
+typedef struct TrackFollow TrackFollow;
+struct TrackFollow {
+};
+
+void trackfollow_begin(TrackFollow*, SegmentIx begin, unsigned backwards,
+		       Distance);
+ 
+
 void safety_train_changed(TrainIx trai) {
   State *s = &safety_actual;
   TrainState *tra = s->tras[trai];
diff --git a/hostside/safety.h b/hostside/safety.h
index 1825811..f552218 100644
--- a/hostside/safety.h
+++ b/hostside/safety.h
@@ -10,14 +10,19 @@ typedef unsigned char Speed; /* non-negative, units of 4mm/s */
 
 typedef struct {
   SegmentIx foredetect;
-  unsigned justarrived:1, reverse:1;
+  unsigned
+    justarrived:1, /* is stopped just after triggering foredetect segment */
+    reverse:1; /* train is moving backwards wrt its own front and back */
   Speed speed;
 } TrainState;
 
 typedef struct {
-  unsigned present_now:1, present_future:1,
-    detectable_now:1, detectable_future:1,
-    sideways:1, autostop:1;
+  unsigned
+    present_now:1, present_future:1, /* owning train is or will use space */
+    detectable_now:1, detectable_future:1, /* owning train draws current */
+    reverse:1, /* owning train's motion is (would be) backwards wrt track */
+    sideways:1, /* for segment with points, points are set to `alternative' */
+    autostop:1; /* owning train is slow and should stop on detection */
   TrainIx owner;
   /*polarity?*/
 } SegmentState;
@@ -36,7 +41,7 @@ typedef struct {
 typedef struct {
   Speed maxspeed;
   int n_detections;
-  const Distance *detections;   /* incremental distances from front */
+  const Distance *detections; /* incremental distances from rear */
 } TrainInfo;
 
 
-- 
2.30.2