54 lines
1.4 KiB
Modula-2
54 lines
1.4 KiB
Modula-2
DEFINITION MODULE CSP;
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(*
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Module: Communicating Sequential Processes
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From: "A Modula-2 Implementation of CSP",
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M. Collado, R. Morales, J.J. Moreno,
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SIGPlan Notices, Volume 22, Number 6, June 1987.
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Version: $Header$
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See this article for an explanation of the use of this module.
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*)
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FROM SYSTEM IMPORT BYTE;
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TYPE Channel;
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PROCEDURE COBEGIN;
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(* Beginning of a COBEGIN .. COEND structure *)
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PROCEDURE COEND;
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(* End of a COBEGIN .. COEND structure *)
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PROCEDURE StartProcess(P: PROC);
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(* Start an anonimous process that executes the procedure P *)
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PROCEDURE StopProcess;
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(* Terminate a Process (itself) *)
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PROCEDURE InitChannel(VAR ch: Channel);
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(* Initialize the channel ch *)
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PROCEDURE GetChannel(ch: Channel);
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(* Assign the channel ch to the process that gets it *)
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PROCEDURE Send(data: ARRAY OF BYTE; VAR ch: Channel);
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(* Send a message with the data to the cvhannel ch *)
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PROCEDURE Receive(VAR ch: Channel; VAR dest: ARRAY OF BYTE);
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(* Receive a message from the channel ch into the dest variable *)
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PROCEDURE SELECT(n: CARDINAL);
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(* Beginning of a SELECT structure with n guards *)
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PROCEDURE NEXTGUARD(): CARDINAL;
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(* Returns an index to the next guard to be evaluated in a SELECT *)
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PROCEDURE GUARD(cond: BOOLEAN; ch: Channel;
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VAR dest: ARRAY OF BYTE): BOOLEAN;
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(* Evaluates a guard, including reception management *)
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PROCEDURE ENDSELECT(): BOOLEAN;
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(* End of a SELECT structure *)
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END CSP.
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