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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Custom Storage Pool questions
Date: Wed, 29 Sep 2021 09:57:32 +0200	[thread overview]
Message-ID: <sj169c$1vkg$1@gioia.aioe.org> (raw)
In-Reply-To: sj03gm$7j9$1@franka.jacob-sparre.dk

On 2021-09-29 00:04, Randy Brukardt wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
> news:siuigp$bqs$1@gioia.aioe.org...
>> On 2021-09-28 09:52, Simon Wright wrote:
>>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>>
>>>> And no object may be destroyed unless deallocated.
>>>
>>> Well, if it's important that an allocated object not be destroyed, don't
>>> allocate it from a storage pool that can go out of scope!
>>
>> That was never the case.
>>
>> The case is that an object allocated in a pool gets finalized because the
>> access type (not the pool!) used to allocate the object goes out of the
>> scope.
>>
>> This makes no sense whatsoever.
>>
>> Again, finalization must be tied with [logical] deallocation. Just like
>> initialization is with allocation.
> 
> But it is. All of the objects allocated from an access type are logically
> deallocated when the access type goes out of scope (and the memory can be
> recovered).

Really? And where is the call to the pool's Deallocate in that case? You 
cannot have it both ways.

> Remember that Ada was designed so that one never needs to use
> Unchecked_Deallocation.

Come on. There never existed Ada compiler with GC. And nobody could even 
implement GC with the meaningless semantics of "collections" in the way, 
killing objects at random. Either with GC or without it, there must be 
no such thing as "collections."

> I could see an unsafe language (like C) doing the sort of thing you suggest,
> but not Ada.

How random finalizing user-allocated and user-freed objects is safe?

And I suggest doing exactly nothing as opposed to *unsafe*, costly and 
meaningless behavior mandated by the standard now.

> Every object in Ada has a specific declaration point,
> initialization point, finalization point, and destruction point. There are
> no exceptions.

Yes, and how it that related to the issue?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de

  reply	other threads:[~2021-09-29  7:57 UTC|newest]

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13  0:53 Custom Storage Pool questions Jere
2021-09-13  5:29 ` Randy Brukardt
2021-09-14  1:04   ` Jere
2021-09-21  0:06     ` Randy Brukardt
2021-09-18 11:32   ` Simon Wright
2021-09-20  0:31   ` Jere
2021-09-20  6:34     ` Niklas Holsti
2021-09-20  6:48       ` Emmanuel Briot
2021-09-20  7:35         ` Dmitry A. Kazakov
2021-09-20 16:59         ` Shark8
2021-09-21  0:50         ` Randy Brukardt
2021-09-21 23:08           ` Jere
2021-09-28  4:42             ` Randy Brukardt
2021-10-02 23:19               ` Jere
2021-10-03  8:52                 ` Dmitry A. Kazakov
2021-10-14  1:26                   ` Randy Brukardt
2021-09-13 11:12 ` J-P. Rosen
2021-09-14  0:48   ` Jere
2021-09-14  6:08     ` J-P. Rosen
2021-09-15  0:39       ` Jere
2021-09-15  7:01         ` Simon Wright
2021-09-16 23:32           ` Jere
2021-09-20 23:51             ` Randy Brukardt
2021-09-21 22:40               ` Jere
2021-09-14  6:23     ` Dmitry A. Kazakov
2021-09-14  6:42       ` J-P. Rosen
2021-09-14  7:00         ` Dmitry A. Kazakov
2021-09-20 23:58         ` Randy Brukardt
2021-09-15  0:21       ` Jere
2021-09-15  6:54         ` Dmitry A. Kazakov
2021-09-20 23:48       ` Randy Brukardt
2021-09-14 10:54     ` Egil H H
2021-09-15  0:11       ` Jere
2021-09-15 16:43 ` Simon Wright
2021-09-15 17:03   ` Simon Wright
2021-09-15 19:07   ` Dmitry A. Kazakov
2021-09-15 20:40     ` Simon Wright
2021-09-16  7:12       ` Emmanuel Briot
2021-09-16 23:21         ` Jere
2021-09-17  7:08           ` Emmanuel Briot
2021-09-17  7:18           ` Simon Wright
2021-09-17 13:56           ` Dmitry A. Kazakov
2021-09-17 19:46             ` Simon Wright
2021-09-17 20:39               ` Dmitry A. Kazakov
2021-09-17 21:17                 ` Niklas Holsti
2021-09-18  7:49                   ` Dmitry A. Kazakov
2021-09-18  9:03                     ` Niklas Holsti
2021-09-18 10:22                       ` Dmitry A. Kazakov
2021-09-18 15:59                         ` Niklas Holsti
2021-09-18 16:19                           ` Dmitry A. Kazakov
2021-09-19 10:36                             ` Niklas Holsti
2021-09-19 11:41                               ` Dmitry A. Kazakov
2021-09-20  7:05                                 ` Niklas Holsti
2021-09-20  7:35                                   ` Dmitry A. Kazakov
2021-09-20  8:08                                     ` Niklas Holsti
2021-09-20  8:28                                       ` Dmitry A. Kazakov
2021-09-21  0:45                                         ` Randy Brukardt
2021-09-21  0:40                                       ` Randy Brukardt
2021-09-21  0:30                                 ` Randy Brukardt
2021-09-21  0:37                                 ` Randy Brukardt
2021-09-21  6:28                                   ` Dmitry A. Kazakov
2021-09-28  4:38                                     ` Randy Brukardt
2021-09-28  7:00                                       ` Dmitry A. Kazakov
2021-09-21  0:26                         ` Randy Brukardt
2021-09-21  6:51                           ` Dmitry A. Kazakov
2021-09-28  4:31                             ` Randy Brukardt
2021-09-28  6:56                               ` Dmitry A. Kazakov
2021-09-28  7:52                                 ` Simon Wright
2021-09-28  8:07                                   ` Dmitry A. Kazakov
2021-09-28 22:04                                     ` Randy Brukardt
2021-09-29  7:57                                       ` Dmitry A. Kazakov [this message]
2021-09-29 14:41                                         ` Shark8
2021-09-29 15:16                                           ` Dmitry A. Kazakov
2021-09-30  0:16                                             ` Randy Brukardt
2021-09-30  8:08                                               ` Dmitry A. Kazakov
2021-10-01  0:04                                                 ` Randy Brukardt
2021-10-01  8:25                                                   ` Dmitry A. Kazakov
2021-10-02  9:06                                                     ` Randy Brukardt
2021-10-02 10:18                                                       ` Dmitry A. Kazakov
2021-10-03  4:33                                                         ` Randy Brukardt
2021-10-03  8:40                                                           ` Dmitry A. Kazakov
2021-10-14  1:21                                                             ` Randy Brukardt
2021-10-14  3:12                                                               ` philip...@gmail.com
2021-10-14  7:31                                                               ` Dmitry A. Kazakov
2021-10-15  0:36                                                                 ` Randy Brukardt
2021-10-15  8:08                                                                   ` Stephen Leake
2021-10-15  8:18                                                                     ` Dmitry A. Kazakov
2021-10-15 22:22                                                                     ` Randy Brukardt
2021-10-15  8:15                                                                   ` Dmitry A. Kazakov
2021-10-15 22:44                                                                     ` Randy Brukardt
2021-10-16  9:00                                                                       ` Dmitry A. Kazakov
2021-10-16 14:32                                                                         ` Simon Wright
2021-10-16 15:06                                                                           ` Dmitry A. Kazakov
2021-10-18 14:23                                                                             ` Shark8
2021-09-21  0:19                     ` Randy Brukardt
2021-09-21  0:18                 ` Randy Brukardt
2021-09-16  8:41       ` Dmitry A. Kazakov
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