|
|
@ -1,4 +1,3 @@ |
|
|
|
<<<<<<< HEAD |
|
|
|
// asynchronous leader election |
|
|
|
// 4 processes |
|
|
|
// gxn/dxp 29/01/01 |
|
|
@ -96,104 +95,3 @@ endrewards |
|
|
|
//---------------------------------------------------------------------------------------------------------------------------- |
|
|
|
formula leaders = (s1=4?1:0)+(s2=4?1:0)+(s3=4?1:0)+(s4=4?1:0)+(s5=4?1:0); |
|
|
|
label "elected" = s1=4|s2=4|s3=4|s4=4|s5=4; |
|
|
|
|
|
|
|
======= |
|
|
|
// asynchronous leader election |
|
|
|
// 4 processes |
|
|
|
// gxn/dxp 29/01/01 |
|
|
|
|
|
|
|
mdp |
|
|
|
|
|
|
|
const int N= 5; // number of processes |
|
|
|
|
|
|
|
//---------------------------------------------------------------------------------------------------------------------------- |
|
|
|
module process1 |
|
|
|
|
|
|
|
// COUNTER |
|
|
|
c1 : [0..5-1]; |
|
|
|
|
|
|
|
// STATES |
|
|
|
s1 : [0..4]; |
|
|
|
// 0 make choice |
|
|
|
// 1 have not received neighbours choice |
|
|
|
// 2 active |
|
|
|
// 3 inactive |
|
|
|
// 4 leader |
|
|
|
|
|
|
|
// PREFERENCE |
|
|
|
p1 : [0..1]; |
|
|
|
|
|
|
|
// VARIABLES FOR SENDING AND RECEIVING |
|
|
|
receive1 : [0..2]; |
|
|
|
// not received anything |
|
|
|
// received choice |
|
|
|
// received counter |
|
|
|
sent1 : [0..2]; |
|
|
|
// not send anything |
|
|
|
// sent choice |
|
|
|
// sent counter |
|
|
|
|
|
|
|
// pick value |
|
|
|
[] (s1=0) -> 0.5 : (s1'=1) & (p1'=0) + 0.5 : (s1'=1) & (p1'=1); |
|
|
|
|
|
|
|
// send preference |
|
|
|
[p12] (s1=1) & (sent1=0) -> (sent1'=1); |
|
|
|
// receive preference |
|
|
|
// stay active |
|
|
|
[p51] (s1=1) & (receive1=0) & !( (p1=0) & (p5=1) ) -> (s1'=2) & (receive1'=1); |
|
|
|
// become inactive |
|
|
|
[p51] (s1=1) & (receive1=0) & (p1=0) & (p5=1) -> (s1'=3) & (receive1'=1); |
|
|
|
|
|
|
|
// send preference (can now reset preference) |
|
|
|
[p12] (s1=2) & (sent1=0) -> (sent1'=1) & (p1'=0); |
|
|
|
// send counter (already sent preference) |
|
|
|
// not received counter yet |
|
|
|
[c12] (s1=2) & (sent1=1) & (receive1=1) -> (sent1'=2); |
|
|
|
// received counter (pick again) |
|
|
|
[c12] (s1=2) & (sent1=1) & (receive1=2) -> (s1'=0) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0); |
|
|
|
|
|
|
|
// receive counter and not sent yet (note in this case do not pass it on as will send own counter) |
|
|
|
[c51] (s1=2) & (receive1=1) & (sent1<2) -> (receive1'=2); |
|
|
|
// receive counter and sent counter |
|
|
|
// only active process (decide) |
|
|
|
[c51] (s1=2) & (receive1=1) & (sent1=2) & (c5=N-1) -> (s1'=4) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0); |
|
|
|
// other active process (pick again) |
|
|
|
[c51] (s1=2) & (receive1=1) & (sent1=2) & (c5<N-1) -> (s1'=0) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0); |
|
|
|
|
|
|
|
// send preference (must have received preference) and can now reset |
|
|
|
[p12] (s1=3) & (receive1>0) & (sent1=0) -> (sent1'=1) & (p1'=0); |
|
|
|
// send counter (must have received counter first) and can now reset |
|
|
|
[c12] (s1=3) & (receive1=2) & (sent1=1) -> (s1'=3) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0); |
|
|
|
|
|
|
|
// receive preference |
|
|
|
[p51] (s1=3) & (receive1=0) -> (p1'=p5) & (receive1'=1); |
|
|
|
// receive counter |
|
|
|
[c51] (s1=3) & (receive1=1) & (c5<N-1) -> (c1'=c5+1) & (receive1'=2); |
|
|
|
|
|
|
|
// done |
|
|
|
[done] (s1=4) -> (s1'=s1); |
|
|
|
// add loop for processes who are inactive |
|
|
|
[done] (s1=3) -> (s1'=s1); |
|
|
|
|
|
|
|
endmodule |
|
|
|
|
|
|
|
//---------------------------------------------------------------------------------------------------------------------------- |
|
|
|
|
|
|
|
// construct further stations through renaming |
|
|
|
module process2=process1[s1=s2,p1=p2,c1=c2,sent1=sent2,receive1=receive2,p12=p23,p51=p12,c12=c23,c51=c12,p5=p1,c5=c1] endmodule |
|
|
|
module process3=process1[s1=s3,p1=p3,c1=c3,sent1=sent3,receive1=receive3,p12=p34,p51=p23,c12=c34,c51=c23,p5=p2,c5=c2] endmodule |
|
|
|
module process4=process1[s1=s4,p1=p4,c1=c4,sent1=sent4,receive1=receive4,p12=p45,p51=p34,c12=c45,c51=c34,p5=p3,c5=c3] endmodule |
|
|
|
module process5=process1[s1=s5,p1=p5,c1=c5,sent1=sent5,receive1=receive5,p12=p51,p51=p45,c12=c51,c51=c45,p5=p4,c5=c4] endmodule |
|
|
|
|
|
|
|
//---------------------------------------------------------------------------------------------------------------------------- |
|
|
|
|
|
|
|
// reward - expected number of rounds (equals the number of times a process receives a counter) |
|
|
|
rewards "rounds" |
|
|
|
[c12] true : 1; |
|
|
|
endrewards |
|
|
|
|
|
|
|
//---------------------------------------------------------------------------------------------------------------------------- |
|
|
|
formula leaders = (s1=4?1:0)+(s2=4?1:0)+(s3=4?1:0)+(s4=4?1:0)+(s5=4?1:0); |
|
|
|
label "elected" = s1=4|s2=4|s3=4|s4=4|s5=4; |
|
|
|
|
|
|
|
>>>>>>> 90d2b218a044edca8062084ee89d171695149c1e |