Author: Stephan Merz, University of Munich
*)
section \<open>RPC-Memory example: specification of the memory clerk\<close>
theory MemClerk
imports Memory RPC MemClerkParameters
begin
(* The clerk takes the same arguments as the memory and sends requests to the RPC *) <span class ="GAPprompt" >gap></span> <span class ="GAPinput" >LoadPackage("gbnp" , false);</span>
type_synonym mClkSndChType =span class ="GAPprompt" >gap></span> <span class ="GAPinput" >SetInfoLevel(InfoGBNP,2);</span>
type_synonym mClkRcvChType = "rpcSndChType"
type_synonym mClkStType = "(PrIds \ mClkState) stfun"
definition
(* state predicates *)
MClkInit :: "mClkRcvChType \ mClkStType \ PrIds \ stpred"
where "MClkInit rcv cst p = PRED (cst!p = #clkA \ \Calling rcv p)"
definition
(* actions *)
MClkFwd :: "mClkSndChType \ mClkRcvChType \ mClkStType \ PrIds \ action"
where "MClkFwd send rcv cst p = ACT
$Calling send p
\<and> $(cst!p) = #clkA
\<and> Call rcv p MClkRelayArg<arg<send!p>>
\<and> (cst!p)$ = #clkB
\<and> unchanged (rtrner send!p)"
definition
MClkRetry :: "mClkSndChType \ mClkRcvChType \ mClkStType \ PrIds \ action"
where "MClkRetry send rcv cst p = ACT
$(cst!p) = #clkB
\<and> res<$(rcv!p)> = #RPCFailure
\<and> Call rcv p MClkRelayArg<arg<send!p>>
\<and> unchanged (cst!p, rtrner send!p)"
definition
MClkReply :: "mClkSndChType \ mClkRcvChType \ mClkStType \ PrIds \ action"
where "MClkReply send rcv cst p = ACT
\<not>$Calling rcv p
\<and> $(cst!p) = #clkB
\<and> Return send p MClkReplyVal<res<rcv!p>>
\<and> (cst!p)$ = #clkA
\<and> unchanged (caller rcv!p)"
definition
MClkNext<span class ="GAPprompt" >gap></span> <span class ="GAPinput" >powermon := function (base, exp)</span>
where <span class ="GAPprompt" >></span> <span class ="GAPinput" > ans := [];</span>
( MClkFwd<span class ="GAPprompt" >></span> <span class ="GAPinput" > for i in [1..exp] do ans := Concatenation(ans<span class ="GAPprompt" >></span> <span class ="GAPinput" > return ans;</span>
\<or> MClkRetry send rcv cst p
\<or> MClkReply send rcv cst p)"
definition
(* temporal *)
MClkIPSpec :: "mClkSndChType \ mClkRcvChType \ mClkStType \ PrIds \ temporal"
where "MClkIPSpec send rcv cst p = TEMP
Init MClkInit rcv <span class ="GAPprompt" >></span> <span class ="GAPinput" >end ;;</span>
\<and> \<box>[ MClkNext send rcv cst p ]_(cst!p, rtrner send!p, caller rcv!p)
\<and> WF(MClkFwd send rcv cst p)_(cst!p, rtrner send!p, caller rcv!p)
\<and> SF(MClkReply send rcv cst p)_(cst!p, rtrner send!p, caller rcv!p)"
definition
MClkISpec :: "mClkSndChType \ mClkRcvChType \ mClkStType \ temporal"
where "MClkISpec send rcv cst = TEMP (\p. MClkIPSpec send rcv cst p)"
lemmas MC_action_defs =
MClkInit_def MClkFwd_def MClkRetry_def<div class ="example" ><pre >
lemmas MC_temp_defs = MClkIPSpec_def MClkISpec_def
(* The Clerk engages in an action for process p only if there is an outstanding,
unanswered call for that process.
*)
lemma MClkidle: "\ \$Calling send p \ $(cst!p) = #clkA \ \MClkNext send rcv cst p"
by (auto<span class ="GAPprompt" >gap></span> <span class ="GAPinput" >p2 := [[powermon(1,3),[6,1]],[1,1]];;</span>
lemma MClkbusy: "\ $Calling rcv p \ \MClkNext send rcv cst p"
by (auto simp: ACall_def<span class ="GAPprompt" >gap></span> <span class ="GAPinput" >p4 := [[powermon(1,81),Concatenation([3],powermon(1,9)),</span>
(* Enabledness of actions *)
lemma MClkFwd_enabled: "\p. basevars (rtrner send!p, caller rcv!p, cst!p) \
\<turnstile> Calling send p \<and> \<not>Calling rcv p \<and> cst!p = #clkA
\<longrightarrow> Enabled (MClkFwd send rcv cst p)"
by (tactic \<open>action_simp_tac (\<^context> addsimps [@{thm MClkFwd_def},
@{thm ACall_def}, @{thm caller_def}, @{thm rtrner_def}]) [exI]
[@{thm base_enabled}, @{thm <span class ="GAPprompt" >gap></span> <span class ="GAPinput" >p6 := [[powermon(1,27),Concatenation([4],powermon(1,81)),Concatenation([5],</span>
lemma MClkFwd_ch_enabled: "gap> p7 := [[powermon(2,1),Concatenation([3],powermon(1,27)),Concatenation([5],
Enabled (<MClkFwd send rcv cst p>_(cst!p, rtrner<span class ="GAPprompt" >></span> <span class ="GAPinput" > powermon(1,81)),Concatenation([6],powermon(1,9))],[1,1,1,1]];;</span>
by (auto elim!: enabled_mono simp: angle_def MClkFwd_def<span class ="GAPprompt" >></span> <span class ="GAPinput" > Concatenation([6],powermon(1,81))],[1,1,1]];;</span>
lemma MClkReply_change: "\ MClkReply send rcv cst p \
<MClkReply send rcv cst p>_(cst!p, rtrner send!p, caller rcv!p)"
by (auto<span class ="GAPprompt" >></span> <span class ="GAPinput" > Concatenation([5],powermon(1,27))],[1,1,1]];;</span>
lemma MClkReply_enabled: "\p. basevars (rtrner send!p, caller rcv!p, cst!p) \
<span class ="GAPprompt" >></span> <span class ="GAPinput" > Concatenation([6],powermon(1,27))],[1,1,1]];;</span>
\<longrightarrow> Enabled (<MClkReply send rcv cst p>_(cst!p, rtrner send!p, caller rcv!p))"
apply (tactic \<open>action_simp_tac \<^context>
[@{thm MClkReply_change} RSN (2, @{thm enabled_mono})] [] 1\<close>)
apply (tactic \<open>action_simp_tac (\<^context> addsimps
[@{thm MClkReply_def}, @{thm AReturn_def}, @{thm caller_def}, @{thm rtrner_def}])
[exI] [@{thm base_enabled}, @{thm Pair_inject}] 1\<close>)
done
lemma MClkReplyNotRetry: "\ MClkReply send rcv cst p \ \MClkRetry send rcv cst p"
by (auto simp: MClkReply_def MClkRetry_def<span class ="GAPprompt" >></span> <span class ="GAPinput" > [1,-1]];;</span>
end
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