Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!kuhub.cc.ukans.edu!markv
From: markv@kuhub.cc.ukans.edu
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Need help accessing MathTrans library from Task
Message-ID: <29024.27db9dce@kuhub.cc.ukans.edu>
Date: 11 Mar 91 21:10:06 GMT
References: <5778@awdprime.UUCP>
Distribution: na
Organization: University of Kansas Academic Computing Services
Lines: 38

In article <5778@awdprime.UUCP>, jason@longhorn.austin.ibm.com (Jason Lowdermilk) writes:
> I'm having a problem accessing the transcendental math library from a 
> "child task" created with CreateTask, in particular the sqrt function.
> I'm using Lattice 5 under WB 1.3. I think I understand why a Task can  
> not use functions in the DOS library, but I can not think of any reason
> why a Task would not be able to access the transcendental library, since
> this does not involve "owning" any resources. Functions from other
> libraries, including the FFP library, work fine. Does anyone have
> experience with this?                                                    

A task can call MathTrans library.  It cannot always call
OpenLibrary("mathtrans.library",34L); because if the library is not in
memory, then Exec will call LoadSeg() to get the library in memory,
which is guarenteed to be a one way trip to la-la land if it isn't a process.

So, the parent of the child needs to OpenLibrary() so that the library
is in memory.  Then the child can get the base from the parent
(easy to do if child is a function in the parent and they share global
data), otherwise the child can call OpenLibrary() as long as the
parent holds mathtrans.library open to keep it in memory.

Note that this applies to *all* disk based libraries (although some
libs that are disk based in 1.3 are in ROM for 2.0).
 
> -- 
> Jason Lowdermilk
>   internet: jason@longhorn.austin.ibm.com
>   UUCP: @cs.utexas.edu:ibmchs!auschs!longhorn.austin.ibm.com!jason
>   VNET: LOWDERMI@DALVM41B
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark Gooderum			Only...		\    Good Cheer !!!
Academic Computing Services	       ///	  \___________________________
University of Kansas		     ///  /|         __    _
Bix:	  mgooderum	      \\\  ///  /__| |\/| | | _   /_\  makes it
Bitnet:   MARKV@UKANVAX		\/\/  /    | |  | | |__| /   \ possible...
Internet: markv@kuhub.cc.ukans.edu
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~