linux-kernel - Re: [PATCH] signals: real-time signals delivery order

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Message-ID:  <loom.20070711T092936-151@post.gmane.org>
Date:	Wed, 11 Jul 2007 07:34:14 +0000 (UTC)
From:	Matthieu CASTET <matthieu.castet@...rot.com>
To:	linux-kernel@...r.kernel.org
Subject:  Re: [PATCH] signals: real-time signals delivery order

Anton Salikhmetov <salikhmetov <at> gmail.com> writes:

> 
> From: Anton Salikhmetov <salikhmetov <at> gmail.com>
> 
> According to the POSIX standard, multiple real-time signals
> pending to a process should be delivered in a strict order.
> Specifically, the lowest-numbered signal should be delivered
> first and multiple occurrences of signals with the same number
> should be delivered in FIFO order.
> 
> Current Linux kernel delivers the highest-numbered signals
> pending to a process first, not the lowest-numbered ones. This
> contradicts to the requirement explained above. The problem can
> be demonstrated by the following test program:
I believe you should check that you mask or signal in your signal handler.
If you don't the high-prio handler will be prempted by low-prio, and they will
be executed in the reverse order.


Matthieu 

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