From: Johannes Sixt <j6t@kdbg.org>
Date: Fri, 01 Apr 2011 20:18:07 GMT
Subject: Re: [PATCH 5/4] run-command: implement abort_async for pthreads
Message-ID: <201104012218.07872.j6t@kdbg.org>
In-Reply-To: <AANLkTimKPD6rw1B9gG3ZN0KEOY41nk=6jE0MVcdotpkp@mail.gmail.com>

On Freitag, 1. April 2011, Erik Faye-Lund wrote:
> On Fri, Apr 1, 2011 at 9:42 PM, Johannes Sixt <j6t@kdbg.org> wrote:
> > But this does not help the case at hand in any way. How would you
> > interrupt a thread that is blocked in ReadFile()? The point of
> > pthread_cancel() is that it interrupts blocked system calls
>
> There is no mention of such a guarantee in POSIX (section 2.9.5 Thread
> Cancellation), so relying on that is undefined behavior.

In the paragraph before the bulleted list at the end of "Cancellation Points":

"...If a thread has cancelability enabled and a cancellation request is made 
with the thread as a target while the thread is suspended at a cancellation 
point, the thread shall be awakened and the cancellation request shall be 
acted upon..."

-- Hannes