--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/HOL/IOA/NTP/Sender.thy Thu Apr 13 16:57:18 1995 +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 + Multiset + 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