linux-kernel - Re: [patch 05/11] syslets: core code

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Date:	Wed, 14 Feb 2007 13:43:33 +0100
From:	Guillaume Chazarain <guichaz@...oo.fr>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 05/11] syslets: core code

Ingo Molnar a écrit :
> +	if (unlikely(signal_pending(t) || need_resched()))
> +		goto stop;
>   

So, this is how you'll prevent me from running an infinite loop ;-)
The attached patch adds a cond_resched() instead, to allow infinite
loops without DoS. I dropped the unlikely() as it's already in the
definition of signal_pending().

> +asmlinkage long sys_async_wait(unsigned long min_wait_events)
>   

Here I would expect:

    sys_async_wait_for_all(struct syslet_atom *atoms, long nr_atoms)

and

    sys_async_wait_for_any(struct syslet_atom *atoms, long nr_atoms).

This way syslets can be used by different parts of a program without
having them waiting for each other.

Thanks.

-- 
Guillaume


View attachment "cond_resched.diff" of type "text/x-patch" (322 bytes)