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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Use of Resident
Message-ID: <8710250912.AA17748@cory.Berkeley.EDU>
Date: Sun, 25-Oct-87 04:12:24 EST
Article-I.D.: cory.8710250912.AA17748
Posted: Sun Oct 25 04:12:24 1987
Date-Received: Tue, 27-Oct-87 01:48:57 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 20

>I recently read that non-reentrant programs can still be made resident as
>long as you only attempt to run one copy at a time.

	I am pretty sure the 'resident' programs are stored as segment
lists (via LoadSeg).  In this case, you cannot make a program resident 
unless it was written to be resident, EVEN IF YOU ONLY RUN ONE COPY AT A 
TIME!.

	The reason is simply... global variables.  If the program modifies
any of it's global variables, they will stay modified when the program is
rerun at some later time.  When one makes a declaration like:

int GlobalVariable = 4;

	One assumes that the variable will hold 4 when the program is first 
run.  Not so if the program modifies it and you then attempt to run the 
program again (if it is resident).  The value will not initially be 4 on
the second running.

					-Matt