system.def

<B>Digital的Unix操作系统VAX 4.2源码</B>

(*#@(#)system.def	4.1	Ultrix	7/17/90 *)
(* $Header: system.def,v 1.3 84/05/27 13:03:19 powell Exp $ *)
This module should not be compiled, but is supplied for documentation purposes.
definition module system;

(* This is a dummy definition module to indicate what is in the built-in *)
(* system module.  Note that case is ignored in built-in identifiers *)

const
    BYTESPERWORD = 4;
    BITSPERWORD = 32;
    MOSTSIGBIT = 31;
    LEASTSIGBIT = 0;
    MAXINT = 2^31-1;
    MAXUNSIGNED = 2^32-1;
    MAXCARD = MAXINT (default) or MAXUNSIGNED (-s option)

type
    Word;	(* parameter compatible with any 1-word thing *)
    Byte = @size 8 Word;
    Address = pointer @nocheck to Word; (* compatible with all pointers *)
    Process;	(* coroutine descriptor *)

procedure Adr(variable : array of Word) : Address;
    (* return the address of the specified variable *)

procedure Size(variable : array of Word) : Cardinal;
    (* returns the size in bits of the specified variable *)

procedure TSize(typeName : Type) : Cardinal;
    (* returns the size in bits of the specified type *)

procedure ByteSize(variable : array of Word) : Cardinal;
    (* returns the size in bytes of the specified variable *)

procedure ByteTSize(typeName : Type) : Cardinal;
    (* returns the size in bytes of the specified type *)

procedure CPUTime() : Cardinal;
    (* returns the accumulated program CPU time in milliseconds *)

procedure NewProcess(procName : Proc; stackArea : Address; stackSize : Cardinal;
		var processVar : Process) ;
    (* Create a coroutine to execute procedure procName using stackArea *)
    (* of size stackSize bits.  return coroutine descriptor in processVar *)

procedure Transfer(var saveCurrent : Process; var transferTo : Process);
    (* save the current coroutine stack in saveCurrent and resume the *) 
    (* coroutine in transferTo *)

end system.