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Subject: Re: light weight user level semaphores
To: alonz@nolaviz.org (Alon Ziv)
Date: Sun, 22 Apr 2001 13:44:46 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <041c01c0cb21$1dd520c0$910201c0@zapper> from "Alon Ziv" at Apr 22, 2001 01:41:04 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> All of this FD allocation stuff is truly distrurbing.
> This appears to be the one place where Win32 got it (almost) right---
> quite about every kernel object looks to userland just like an opaque
> handle, and the same operations apply to all of them.

Unix got this right, then AT&T broke it in System III. One very good reason
for pipe based semaphore stuff is precisely that it works in poll/select/SIGIO

Alan

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