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Date: Tue, 6 Sep 2011 10:36:46 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Aleksey's Status Report #17
Aleksey,
On Tue, Sep 06, 2011 at 10:19:50AM +0400, Solar Designer wrote:
> Isn't QFileSystemWatcher implemented with a timer too? Or does it
> start a separate thread, which blocks on read from the file?
Sorry, this last guess is nonsense - read(2) doesn't block on EOF on a
regular file, it merely returns 0. Even "tail -f" simply polls for more
data after sleeping for a while (typically for 1 second) for that reason.
So it is fairly clear that QFileSystemWatcher has to be timer-based.
> On recent Linux there's inotify, but it's not portable, so I doubt that
> Qt uses it. And even if it did, there would be a fallback to something
> else on other systems, which we need to consider.
Alexander
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