5318c1f966
* iface/dve2/defs.in, iface/dve2/dve2check.test, iface/dve2/beem-peterson.4.dve: New files. * iface/dve2/Makefile.am: Add them. * configure.ac: Generate iface/dve2/defs.
63 lines
1.8 KiB
Text
63 lines
1.8 KiB
Text
// peterson mutual exclusion protocol for N processes
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// Comes from http://anna.fi.muni.cz/models/cgi/model_info.cgi?name=peterson
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// Also distributed with DiVinE (using dual GPL and BSD licences)
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byte pos[4];
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byte step[4];
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process P_0 {
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byte j=0, k=0;
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state NCS, CS, wait ,q2,q3;
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init NCS;
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trans
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NCS -> wait { effect j = 1; },
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wait -> q2 { guard j < 4; effect pos[0] = j;},
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q2 -> q3 { effect step[j-1] = 0, k = 0; },
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q3 -> q3 { guard k < 4 && (k == 0 || pos[k] < j); effect k = k+1;},
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q3 -> wait { guard step[j-1] != 0 || k == 4; effect j = j+1;},
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wait -> CS { guard j == 4; },
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CS -> NCS { effect pos[0] = 0;};
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}
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process P_1 {
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byte j=0, k=0;
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state NCS, CS, wait ,q2,q3;
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init NCS;
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trans
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NCS -> wait { effect j = 1; },
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wait -> q2 { guard j < 4; effect pos[1] = j;},
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q2 -> q3 { effect step[j-1] = 1, k = 0; },
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q3 -> q3 { guard k < 4 && (k == 1 || pos[k] < j); effect k = k+1;},
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q3 -> wait { guard step[j-1] != 1 || k == 4; effect j = j+1;},
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wait -> CS { guard j == 4; },
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CS -> NCS { effect pos[1] = 0;};
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}
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process P_2 {
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byte j=0, k=0;
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state NCS, CS, wait ,q2,q3;
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init NCS;
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trans
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NCS -> wait { effect j = 1; },
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wait -> q2 { guard j < 4; effect pos[2] = j;},
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q2 -> q3 { effect step[j-1] = 2, k = 0; },
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q3 -> q3 { guard k < 4 && (k == 2 || pos[k] < j); effect k = k+1;},
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q3 -> wait { guard step[j-1] != 2 || k == 4; effect j = j+1;},
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wait -> CS { guard j == 4; },
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CS -> NCS { effect pos[2] = 0;};
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}
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process P_3 {
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byte j=0, k=0;
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state NCS, CS, wait ,q2,q3;
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init NCS;
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trans
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NCS -> wait { effect j = 1; },
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wait -> q2 { guard j < 4; effect pos[3] = j;},
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q2 -> q3 { effect step[j-1] = 3, k = 0; },
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q3 -> q3 { guard k < 4 && (k == 3 || pos[k] < j); effect k = k+1;},
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q3 -> wait { guard step[j-1] != 3 || k == 4; effect j = j+1;},
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wait -> CS { guard j == 4; },
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CS -> NCS { effect pos[3] = 0;};
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}
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system async;
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