From: Egil H H <ehh.public@gmail.com>
Subject: Re: Ada x <whatever> Datagram Sockets
Date: Wed, 6 Feb 2019 22:00:09 -0800 (PST)
Date: 2019-02-06T22:00:09-08:00 [thread overview]
Message-ID: <d1be2aab-b492-4d1e-9021-4d057c04486b@googlegroups.com> (raw)
In-Reply-To: <62406dfb-54c9-4db3-b461-0ad72d4a782c@googlegroups.com>
> > On Wednesday, February 6, 2019 at 6:10:37 PM UTC-5, Rego, P. wrote:
>
> Just the string "test". I also confirmed that the MQL container (uchar data[]) has really the size 5.
>
Right, Ada strings are not zero-terminated, and the size of the string needs
to come from somewhere, which is why String'Input will interpret the first x bits (probably 32, but may depend on your platform) as the length. So in this
case, "test" becomes a big number and 'Input will most likely try to allocate
just under 2GB on your stack (and probably at least twice, in order to copy
the result into your string).
Don't use Ada stream attributes to communicate with other languages.
And, as some will tell you, don't use them at all, especially for arrays, as
each array element may end up being transferred as a single data packet, destroying performance.
--
~egilhh
next prev parent reply other threads:[~2019-02-07 6:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-06 23:10 Ada x <whatever> Datagram Sockets Rego, P.
2019-02-07 0:42 ` Jere
2019-02-07 5:28 ` Rego, P.
2019-02-07 6:00 ` Egil H H [this message]
2019-02-07 6:41 ` Rego, P.
2019-02-07 7:23 ` Egil H H
2019-02-07 11:48 ` Jere
2019-02-08 19:41 ` Rego, P.
2019-02-08 20:31 ` Dmitry A. Kazakov
2019-02-08 21:56 ` Rego, P.
2019-02-07 8:28 ` Dmitry A. Kazakov
2019-02-07 10:08 ` Simon Wright
2019-02-08 0:15 ` Randy Brukardt
2019-02-08 8:25 ` Simon Wright
2019-02-08 13:24 ` Dmitry A. Kazakov
2019-02-09 1:01 ` Randy Brukardt
2019-02-10 17:54 ` Simon Wright
2019-02-11 8:39 ` Dmitry A. Kazakov
2019-02-11 13:35 ` Simon Wright
2019-02-11 14:25 ` Dmitry A. Kazakov
2019-02-11 15:19 ` Simon Wright
2019-02-11 16:04 ` Dmitry A. Kazakov
2019-02-11 23:19 ` Randy Brukardt
2019-02-12 11:35 ` Simon Wright
2019-02-08 19:44 ` Rego, P.
2019-02-07 11:47 ` Jere
2019-02-07 18:00 ` Jeffrey R. Carter
2019-02-08 20:35 ` Rego, P.
2019-02-08 21:26 ` Jeffrey R. Carter
2019-02-08 22:02 ` Rego, P.
2019-02-08 21:38 ` Dmitry A. Kazakov
2019-02-08 20:00 ` Rego, P.
2019-02-07 10:11 ` Simon Wright
2019-02-08 20:03 ` Rego, P.
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