From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Delayed deallocation of non-terminated task in Gnat?
Date: Wed, 31 Aug 2011 14:08:26 -0400
Date: 2011-08-31T14:08:26-04:00 [thread overview]
Message-ID: <wccr5413145.fsf@shell01.TheWorld.com> (raw)
In-Reply-To: 31ba531d-fa8e-40f3-97bc-c9112b329fe2@14g2000prv.googlegroups.com
Marc C <mc.provisional@gmail.com> writes:
> This *looks* to me like one could dynamically allocate a task instance
> and then immediately free it with an instantiation of
> Unchecked_Deallocation, yet the task would continue to function
> normally until it terminates.
Yes. Ada semantics requires that if you call Unchecked_Deallocation
on an object that contains running tasks, the tasks keep running.
In the old version of GNAT, U_D would say "Is the task terminated?
If so, free up its resources. If not, do nothing." So it could
leak memory.
The new version of GNAT is better: "Is the task terminated?
If so, free up its resources. If not, cause its resources
to be freed up when it does terminate."
But you have to be careful: Like any U_D, you can have
dangling pointers.
- Bob
prev parent reply other threads:[~2011-08-31 18:08 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-30 13:22 Delayed deallocation of non-terminated task in Gnat? Marc C
2011-08-30 15:20 ` Dmitry A. Kazakov
2011-08-31 18:12 ` Robert A Duff
2011-08-31 19:23 ` Dmitry A. Kazakov
2011-08-31 20:58 ` Robert A Duff
2011-08-31 21:16 ` Jeffrey Carter
2011-08-31 20:25 ` J-P. Rosen
2011-08-31 21:09 ` Robert A Duff
2011-08-31 21:53 ` Simon Wright
2011-08-30 15:38 ` Adam Beneschan
2011-08-30 16:42 ` Dmitry A. Kazakov
2011-08-30 18:57 ` Niklas Holsti
2011-08-30 19:23 ` Dmitry A. Kazakov
2011-08-31 16:39 ` Adam Beneschan
2011-08-31 18:21 ` Robert A Duff
2011-08-31 23:28 ` Adam Beneschan
2011-09-01 11:58 ` Robert A Duff
2011-08-31 20:30 ` J-P. Rosen
2011-08-31 22:36 ` Adam Beneschan
2011-09-01 5:24 ` J-P. Rosen
2011-08-31 18:08 ` Robert A Duff [this message]
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