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Date: Thu, 28 Nov 2002 02:20:32 +0100
From: thomas <tom AT huno DOT net>
Reply-To: thomas <cygwin AT cygwin DOT com>
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Message-ID: <5549457171.20021128022032@huno.net>
To: Christopher Faylor <cygwin AT cygwin DOT com>
Subject: Re: pipe performance problem
In-Reply-To: <20021128003443.GD21457@redhat.com>
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Christopher Faylor <cgf-cygwin AT cygwin DOT com> wrote:

> On Thu, Nov 28, 2002 at 01:20:46AM +0100, thomas wrote:
>>Christopher Faylor <cgf-noreply AT cygwin DOT com> wrote:
>>
>>> If there is no data in a pipe it can wait for 10ms waiting for it, yes.
>>> See ready_for_read/peek_pipe in select.cc.
>>
>>Yep i saw the Sleep (10) and though the same thing, but i figured that
>>can't be it when i commented it out, compiled a new cygwin1.dll and the
>>10ms delay was still there.

> It's not a Sleep 10.  It's a WaitForSingleObject in ready_for_read.

Yep you are right. It waits, here:

if (WaitForSingleObject (signal_arrived, avail ? 0 : 10) == WAIT_OBJECT_0)

now is to find out why. i will post again :)

thomas


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