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From: schwering <schwering@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Blocking syscalls in Tasks
Date: Sat, 27 Sep 2008 13:02:34 -0700 (PDT)
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Date: 2008-09-27T13:02:34-07:00
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On 27 Sep., 20:58, Hibou57 (Yannick Duch=EAne)
<yannick_duch...@yahoo.fr> wrote:

> I've tryed to check for a reliable references, and found something
> which may help you to make some assertion. It seems that it is thread/
> task blocking rather than process blocking. This is based on mail
> exchanged by developpers of the Linux kernel. It is dated Sun, 12 Aug
> 2007, so do not make assertion using this about too much old kernels
> (you did not say what kernel version you use, neither if it is a
> vanilla one or not)
>
> Here is the link to the mail at the LKML mail archives :http://lkml.org/l=
kml/2007/8/12/102


Hi,

I think this only refers to the Linux kernel's threads. As far as I
know (I'm far from being an expert in threads..), in kernelspace
threads, a syscall does not block the entire process but only the
calling thread. In fact, this is the main advantage over userspace
threads.

I don't know whether Ada tasks necessarily are threads and whether it
is specified whether they are kernel- or userspace threads or some
hybrid stuff.

Chris