55 lines
1,013 B
Modula-2
55 lines
1,013 B
Modula-2
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MODULE Shoes;
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(* From: MODULA-2, An Introduction, by Daniel Thalmann, Springer-Verlag,
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New York, 1985
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Figure 21.3
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*)
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FROM SYSTEM IMPORT WORD, ADR, ADDRESS, NEWPROCESS, TRANSFER;
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FROM InOut IMPORT Write, WriteLn;
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CONST
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WorkLength = 200;
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MaxShoes = 50;
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MaxDif = 6;
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TYPE
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WorkSpace = ARRAY [0..WorkLength-1] OF WORD;
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VAR
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NbLeft, NbRight : INTEGER;
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WSLeft, WSRight : WorkSpace;
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Left, Right, Main : ADDRESS;
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PROCEDURE Leftp;
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BEGIN
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WHILE NbLeft < MaxShoes DO
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INC(NbLeft);
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Write("L");
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IF (NbLeft-NbRight>=MaxDif) OR (NbLeft>=MaxShoes) THEN
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TRANSFER(Left,Right);
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END;
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END;
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WriteLn;
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END Leftp;
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PROCEDURE Rightp;
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BEGIN
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WHILE NbRight < MaxShoes DO
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INC(NbRight);
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Write("R");
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IF (NbRight-NbLeft>=MaxDif) OR (NbRight>=MaxShoes) THEN
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TRANSFER(Right,Left);
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END;
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END;
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WriteLn;
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END Rightp;
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BEGIN
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NbLeft := 0;
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NbRight := 0;
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NEWPROCESS(Leftp,ADR(WSLeft),SIZE(WSLeft),Left);
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NEWPROCESS(Rightp,ADR(WSRight),SIZE(WSRight),Right);
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TRANSFER(Main,Left);
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END Shoes.
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