From: Robert Klemme <shortcutter@...>
Date: 2013-04-09T23:04:29+09:00
Subject: Re: Mapping string data ptr to buffer in ffi

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On Tue, Apr 9, 2013 at 11:10 AM, se gm <lists@ruby-forum.com> wrote:

> >although he never explicitly
> >stated whether resizing would be necessary.
> Resizing in my case is not necessary. Many fragments may be mapped into
> one or more huge strings which are not changed from Ruby environment
> (they are just preallocated).
> >and apparently also without proper synchronization.
> That is totally wrong. If it is syncronized for the particular situation
> then one can call it "right", and the language concepts would be
> irrelevant. The actual syncronization is the only thing that matters.
>

Well, Ruby's String certainly has no synchronizations built in with the
library you want to integrate so how will you ensure that there is proper
synchronization?  So far I have only seen that you want to share the memory
of a Ruby string's byte array with some third party library which will then
write to the memory from threads not controlled by Ruby.  You said you need
"only one blocking syncronization call from Ruby to start working with the
string" - but what do you do afterwards, i.e. while the processing is under
way and "the string changes should be immediately visible in Ruby"?

Cheers

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Tue, Apr 9, 2013 at 11:10 AM, se gm <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-forum.com</a=
>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div>&gt;although he never explicitly<br>
&gt;stated whether resizing would be necessary.<br>
</div>Resizing in my case is not necessary. Many fragments may be mapped in=
to<br>
one or more huge strings which are not changed from Ruby environment<br>
(they are just preallocated).<br>
<div>&gt;and apparently also without proper synchronization.<br>
</div>That is totally wrong. If it is syncronized for the particular situat=
ion<br>
then one can call it &quot;right&quot;, and the language concepts would be<=
br>
irrelevant. The actual syncronization is the only thing that matters.<br></=
blockquote></div><br>Well, Ruby&#39;s String certainly has no synchronizati=
ons built in with the library you want to integrate so how will you ensure =
that there is proper synchronization? =A0So far I have only seen that you w=
ant to share the memory of a Ruby string&#39;s byte array with some third p=
arty library which will then write to the memory from threads not controlle=
d by Ruby. =A0You said you need &quot;<span style=3D"font-family:arial,sans=
-serif;font-size:13px">only one blocking syncronization call from Ruby to s=
tart working=A0</span><span style=3D"font-size:13px;font-family:arial,sans-=
serif">with the string</span>&quot; - but what do you do afterwards, i.e. w=
hile the processing is under way and &quot;<span style=3D"font-family:arial=
,sans-serif;font-size:13px">the string changes should be immediately=A0</sp=
an><span style=3D"font-size:13px;font-family:arial,sans-serif">visible in R=
uby</span>&quot;?</div>

<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Cheers</div=
><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">robert<br =
clear=3D"all"><div><br></div>-- <br>remember.guy do |as, often| as.you_can =
- without end<br>

<a href=3D"http://blog.rubybestpractices.com/" target=3D"_blank">http://blo=
g.rubybestpractices.com/</a>
</div></div>

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