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					|  |  |  | <<<<<<< 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; | 
			
		
	
		
			
				
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					|  |  |  | ======= | 
			
		
	
		
			
				
					|  |  |  | // asynchronous leader election | 
			
		
	
		
			
				
					|  |  |  | // 4 processes | 
			
		
	
		
			
				
					|  |  |  | // gxn/dxp 29/01/01 | 
			
		
	
		
			
				
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					|  |  |  | mdp | 
			
		
	
		
			
				
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					|  |  |  | const int N= 5; // number of processes | 
			
		
	
		
			
				
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					|  |  |  | //---------------------------------------------------------------------------------------------------------------------------- | 
			
		
	
		
			
				
					|  |  |  | 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); | 
			
		
	
		
			
				
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					|  |  |  | endmodule | 
			
		
	
		
			
				
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					|  |  |  | //---------------------------------------------------------------------------------------------------------------------------- | 
			
		
	
		
			
				
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					|  |  |  | // 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 | 
			
		
	
		
			
				
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					|  |  |  | //---------------------------------------------------------------------------------------------------------------------------- | 
			
		
	
		
			
				
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					|  |  |  | // reward - expected number of rounds (equals the number of times a process receives a counter) | 
			
		
	
		
			
				
					|  |  |  | rewards "rounds" | 
			
		
	
		
			
				
					|  |  |  | 	[c12] true : 1; | 
			
		
	
		
			
				
					|  |  |  | endrewards | 
			
		
	
		
			
				
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					|  |  |  | //---------------------------------------------------------------------------------------------------------------------------- | 
			
		
	
		
			
				
					|  |  |  | 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; | 
			
		
	
		
			
				
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					|  |  |  | >>>>>>> 90d2b218a044edca8062084ee89d171695149c1e |