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Re: Portabilty of poll trick

From: Bastien ROUCARIES
Subject: Re: Portabilty of poll trick
Date: Tue, 27 Apr 2021 22:46:31 +0000

Le mar. 27 avr. 2021 à 22:40, Bruno Haible <bruno@clisp.org> a écrit :
> Hi Bastien,
> > I want to assess the safety and portability of the following trick,
> I would want to help you with this, but I can't. You have not stated:
>   - What is this code supposed to do?
I want to shutdown (2) a pipe, in a multithread application, in order
to get out a poll(2) wait state
>   - Why is it a "trick"? What advantages does it have compared to the code
>     a naïve developer would write?
The naive delevopper will:
- close the end of the pipe, but it does not break poll(2), and
moreover in multithread context
it is not safe due to fd reuse
-use timeout but in this case why use poll...

The goal is also to shutdown an eventfd but without kernel support, I
suppose it is not possible...

> > for getting outside poll.
> I don't understand what you mean here.
> Bruno

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