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From: Fraser Wilson <newsfraser@blancolioni.org>
Newsgroups: comp.lang.ada
Subject: Re: new_line in a put_line
References: <aserlb$juh$1@fang.dsto.defence.gov.au>
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Date: 03 Dec 2002 12:33:37 +0100
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Date: 2002-12-03T12:33:37+01:00
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mheaney@on2.com (Matthew Heaney) writes:

> If you have multiple tasks writing to the same file, then you're going
> to have to synchronize access to the file through some intermediary,
> as a task or protected object (the latter requires care).

I've seen a couple of mentions of problems using protected objects for
atomic file output.  What's the specific issue?  I.e., why isn't this
sufficient?

   protected File_Operation is
      procedure Put_Line (Text : String);
   end File_Operation;

   protected body File_Operation is
      procedure Put_Line (Text : String) is
      begin
         Ada.Text_IO.Put_Line (Text);
      end Put_Line;
   end File_Operation;

Oh, wait on, is it something to do with 9.5.1(8)?

Fraser.