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Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!emory!hubcap!billwolf%hazel.cs.clemson.edu
From: billwolf%hazel.cs.clemson.edu@hubcap.clemson.edu (William Thomas Wolfe, 2847 )
Newsgroups: comp.lang.ada
Subject: Re: ADA and SIGALARM
Message-ID: <8112@hubcap.clemson.edu>
Date: 22 Feb 90 01:57:15 GMT
References: <1990Feb21.205907.27015@cec1.wustl.edu>
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Reply-To: billwolf%hazel.cs.clemson.edu@hubcap.clemson.edu
List-Id: <comp.lang.ada>

>From meh@wucs1.wustl.edu (Mark E Hunter):
> I am running an
> ADA multitasking program under Sunview on a sun
> workstation.  Very often, the program crashes.  This
> appears to happen when an ADA task picks up an 
> alarm meant for Sunview.  What is going on here? 

   If you are using the Telesoft compiler, section 1.2.3.1 of the 
   Software Extensions User Guide specifically states (page 1-3) 
   that "The Ada run-time kernel uses SIGALARM for implementing 
   DELAY statements, timed ENTRY calls, and selective waits with 
   DELAY alternatives.  [...] When the SunView notifier is called... 
   it issues a system call that will replace the Ada kernel's timer 
   interrupt handler with its own.  [...] In future releases, a special
   version of the Ada run-time kernel that cooperates with the SunView 
   kernel will be included in the SunView Bindings sublibrary.  That 
   kernel will allow full use of Ada tasking with SunView."


   Bill Wolfe, wtwolfe@hubcap.clemson.edu