Last modified on Tue Jun 15 10:06:38 1993 by gnelson modified on Thu May 27 17:20:56 PDT 1993 by swart modified on Fri Feb 7 00:03:04 PST 1992 by muller modified on Tue Jan 28 12:45:57 PST 1992 by kalsow

The UnsafeRd interface is similar to Rd, but GetChar, GetSub and Eof are the only operations that are sufficiently performance-critical to be included.

Note that if you import this interface along with RdClass that you must include the following line:

REVEAL RdClass.Private <: MUTEX

in order to satisfy the constraint that the revealed supertypes of an opaque type be totally ordered.

INTERFACE UnsafeRd;
IMPORT Rd, Thread;
FROM Thread IMPORT Alerted;
FROM Rd IMPORT Failure, EndOfFile;

REVEAL
  Rd.T <: Thread.Mutex;

PROCEDURE FastGetChar(rd: Rd.T): CHAR RAISES {EndOfFile, Failure, Alerted};

Like Rd.GetChar, but rd must be locked.

PROCEDURE FastGetWideChar(rd: Rd.T): WIDECHAR RAISES {EndOfFile, Failure, Alerted};

Like Rd.GetWideChar, but rd must be locked.

PROCEDURE FastGetSub(rd: Rd.T; VAR (*OUT*) str: ARRAY OF CHAR): CARDINAL
    RAISES {Failure, Alerted};

Like Rd.GetSub, but rd must be locked.

PROCEDURE FastGetWideSub(rd: Rd.T; VAR (*OUT*) str: ARRAY OF WIDECHAR): CARDINAL
    RAISES {Failure, Alerted};

Like Rd.GetWideSub, but rd must be locked.

PROCEDURE FastEOF(rd: Rd.T): BOOLEAN RAISES {Failure, Alerted};

Like Rd.EOF, but rd must be locked.

PROCEDURE FastUnGetChar(rd: Rd.T) RAISES {};

Like Rd.UnGetChar, but rd must be locked.

PROCEDURE FastClose (rd: Rd.T) RAISES {Failure, Alerted};

END UnsafeRd.