--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/HOLCF/IOA/NTP/Sender.thy Wed Apr 30 11:25:31 1997 +0200
@@ -0,0 +1,85 @@
+(* Title: HOL/IOA/NTP/Sender.thy
+ ID: $Id$
+ Author: Tobias Nipkow & Konrad Slind
+ Copyright 1994 TU Muenchen
+
+The implementation: sender
+*)
+
+Sender = IOA + Action + List +
+
+types
+
+'m sender_state = "'m list * bool multiset * bool multiset * bool * bool"
+(* messages #sent #received header mode *)
+
+consts
+
+sender_asig :: 'm action signature
+sender_trans :: ('m action, 'm sender_state)transition set
+sender_ioa :: ('m action, 'm sender_state)ioa
+sq :: 'm sender_state => 'm list
+ssent,srcvd :: 'm sender_state => bool multiset
+sbit :: 'm sender_state => bool
+ssending :: 'm sender_state => bool
+
+defs
+
+sq_def "sq == fst"
+ssent_def "ssent == fst o snd"
+srcvd_def "srcvd == fst o snd o snd"
+sbit_def "sbit == fst o snd o snd o snd"
+ssending_def "ssending == snd o snd o snd o snd"
+
+sender_asig_def
+ "sender_asig == ((UN m. {S_msg(m)}) Un (UN b. {R_ack(b)}),
+ UN pkt. {S_pkt(pkt)},
+ {C_m_s,C_r_s})"
+
+sender_trans_def "sender_trans ==
+ {tr. let s = fst(tr);
+ t = snd(snd(tr))
+ in case fst(snd(tr))
+ of
+ S_msg(m) => sq(t)=sq(s)@[m] &
+ ssent(t)=ssent(s) &
+ srcvd(t)=srcvd(s) &
+ sbit(t)=sbit(s) &
+ ssending(t)=ssending(s) |
+ R_msg(m) => False |
+ S_pkt(pkt) => hdr(pkt) = sbit(s) &
+ (? Q. sq(s) = (msg(pkt)#Q)) &
+ sq(t) = sq(s) &
+ ssent(t) = addm (ssent s) (sbit s) &
+ srcvd(t) = srcvd(s) &
+ sbit(t) = sbit(s) &
+ ssending(s) &
+ ssending(t) |
+ R_pkt(pkt) => False |
+ S_ack(b) => False |
+ R_ack(b) => sq(t)=sq(s) &
+ ssent(t)=ssent(s) &
+ srcvd(t) = addm (srcvd s) b &
+ sbit(t)=sbit(s) &
+ ssending(t)=ssending(s) |
+ C_m_s => count (ssent s) (~sbit s) < count (srcvd s) (~sbit s) &
+ sq(t)=sq(s) &
+ ssent(t)=ssent(s) &
+ srcvd(t)=srcvd(s) &
+ sbit(t)=sbit(s) &
+ ssending(s) &
+ ~ssending(t) |
+ C_m_r => False |
+ C_r_s => count (ssent s) (sbit s) <= count (srcvd s) (~sbit s) &
+ sq(t)=tl(sq(s)) &
+ ssent(t)=ssent(s) &
+ srcvd(t)=srcvd(s) &
+ sbit(t) = (~sbit(s)) &
+ ~ssending(s) &
+ ssending(t) |
+ C_r_r(m) => False}"
+
+sender_ioa_def "sender_ioa ==
+ (sender_asig, {([],{|},{|},False,True)}, sender_trans)"
+
+end