Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!ucsd!nosc!helios.ee.lbl.gov!pasteur!ames!oliveb!amiga!cbmvax!carolyn
From: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Reentrant Lattice C code
Message-ID: <4373@cbmvax.UUCP>
Date: 1 Aug 88 15:09:22 GMT
References: <3025@cs.utexas.edu>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Organization: Commodore Technology, West Chester, PA
Lines: 33

In article <3025@cs.utexas.edu> bryan@mothra.cs.utexas.edu writes:
>
>	Is there any way to bully Lattice C 4.0 into producing reentrant
>(sharable) code, that is, get rid of all absolute references from the code to
>the data segment?  

   I have a couple of versions of reentrant startup code which will
appear on the 1.3 Native Developer Update disks when 1.3 is released.
These startups can be used in place of Astartup (not Lstartup/c.o).
So if you program can be compiled -v and linked with Astartup.obj...
LIBRARY Amiga.lib, LC.lib, and you write YOUR code so it is reentrant,
you can link with the new reentrant startup code and create executables
that can be made resident. (like 1.3 More program, etc.)

   Making YOUR code reentrant involves having no globals except for
constants (like error message strings, etc), and library bases.
When doing OpenLibrary(), you must keep your result in a local
variable, only store to the global Base if successful, and use your
local when you CloseLibrary.

  If you have a lot of variables that need to be "known" to all of
your subroutines, you can put them all in a dynamically allocated and
cleared structure, and pass a pointer to that structure to each of your
routines.  This has a minimal impact on your coding style, and makes
it fairly easy to retrofit reentrancy on existing code.

-- 
==========================================================================
  Carolyn Scheppner -- CATS  Commodore Amiga Technical Support
  PHONE 215-431-9180   UUCP  ...{uunet,allegra,rutgers}!cbmvax!carolyn 

 Calm down.  It's just ones and zeros.
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