🚀 go-pugleaf

>>>>> On Tuesday, 1 Sep 1992 12:20:42 TUR, Pinar Aydemir <A10742@TRMETU.BITNET> said:

> I almost hear everyday that msdos is non-reentrant.
> It is non re-entrant so dont call a dos funcion from a Interrupt Service
> Routine.
> Since It is non reentrant, bla bla bla.

> I looked at some books about OS, and the definition of reentrancy is
> given as being unmodified (pure) code.So, what makes msdos non reentrant ?
> Any information  is appreciated.

msdos is reentrant because it has been designed so. When writing the
code of a particular routine you may tell the compiler that at
runtime, either its data segments are fixed (say a memory position) or
re-definable (say a new memory position at each call), the latter
routine only is called re-entrant. Note such a routine may call itself
without any problem... provided it has an exit path (for example after
10 times).

	Hope I helped somehow,
--
--------------------------------------------------------------------------------
 Claude Bouillin - (Internet: bouillin@ntc.nokia.com)      Phone 358-0-511 7736
         (X.400:   C=FI,A=Elisa,P=Nokia Telecom,S=Bouillin,Gi=Claude)
 Nokia Telecommunications, PO box 12, 02611 Espoo, Finland   Fax 358-0-511 7432
--------------------------------------------------------------------------------