From: Andi Kleen <ak@suse.de>
To: David Feuer <David_Feuer@brown.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Select
Date: Sun, 5 Nov 2000 10:48:52 +0100 [thread overview]
Message-ID: <20001105104852.A25402@gruyere.muc.suse.de> (raw)
In-Reply-To: <4.3.2.7.2.20001105014402.00adee30@postoffice.brown.edu>
In-Reply-To: <4.3.2.7.2.20001105014402.00adee30@postoffice.brown.edu>; from David_Feuer@brown.edu on Sun, Nov 05, 2000 at 01:46:19AM -0500
On Sun, Nov 05, 2000 at 01:46:19AM -0500, David Feuer wrote:
> In the discussion on "select bug", some people noted that select does not
> wake up a process until the buffer is half full (or all full, or
> whatever). Does this mean that if a small amount is written to the
> device/pipe the process may never be woken? Or is there a time limit that
> wakes up the process after a certain amount of time if there are _any_
> bytes in the pipe/dev?
This only applies to POLLOUT. Yes, if an send buffer stays 90%
full forever you may be never woken up.
In case of a TCP socket you would be at worst waken up after considerable
time with a ETIMEDOUT.
Pipes do not signal writable until the pipe is empty.
-Andi
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next prev parent reply other threads:[~2000-11-05 9:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-05 6:46 Select David Feuer
2000-11-05 9:48 ` Andi Kleen [this message]
2000-11-05 12:19 ` Select Alan Cox
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