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From: cowan@east.alsys.com (Ken Cowan)
Subject: Re: Asynchronous Transfer of Control
Date: 1996/10/18
Message-ID: <DzH5n3.2rE@thomsoft.com>#1/1
X-Deja-AN: 190509187
sender: news@thomsoft.com
references: <32656457.1A76@csehp1.mdc.com>
 <DzF1Fo.CJs.0.-s@inmet.camb.inmet.com> <DzFAMr.6DG@world.std.com>
organization: Thomson Software Products
newsgroups: comp.lang.ada
Date: 1996-10-18T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <DzFAMr.6DG@world.std.com>,
   bobduff@world.std.com (Robert A Duff) wrote:

>On Windows 95, the only way I can see to implement preemptive 
abort/ATC
>is for the compiler to insert polling code all over the program (maybe
>at every call, and at every backward jump?).  If true, this is 
horrible
>-- operating systems of decades ago had proper support for this sort 
of
>thing, but the latest and greatest doesn't.  Does any compiler do 
this?
>Is there any better way to implement it on windows 95?  There's some
>sort of kill-thread operation, but that would skip finalization.  I
>think the situation is the same for OS/2.  What about windows/NT?
>
>- Bob

Give ObjectAda for Windows a try.  It does preemptive abort without
polling.  It's implemented by suspending the thread, then
resuming it at some run-down code.  For ATC, the run-down code
longjmp's back to the correct place.  For an abort, it finalizes
everything and terminates the thread.

  KC


---------------------------------------------------------
Ken Cowan                       Thomson Software Products
cowan@east.thomsoft.com         200 Wheeler Rd.
phone: (617) 221-7323           Burlington, MA 01803
fax: (617) 220-6882