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Subject: Re: Quick testfeedback...
From: Robert Collins <robert DOT collins AT itdomain DOT com DOT au>
To: cygwin-developers AT cygwin DOT com
In-Reply-To: <20010912132302.A18631@redhat.com>
References: <1000209619 DOT 7293 DOT 196 DOT camel AT lifelesswks>
	<20010912184031 DOT X1285 AT cygbert DOT vinschen DOT de>
	<20010912184812 DOT Z1285 AT cygbert DOT vinschen DOT de>
	<20010912125641 DOT A18358 AT redhat DOT com>
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	<20010912132302 DOT A18631 AT redhat DOT com>
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Date: 13 Sep 2001 08:46:41 +1000
Message-Id: <1000334802.31743.37.camel@lifelesswks>
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X-OriginalArrivalTime: 12 Sep 2001 22:33:31.0531 (UTC) FILETIME=[F36275B0:01C13BDA]

On Thu, 2001-09-13 at 03:23, Christopher Faylor wrote:
> On Wed, Sep 12, 2001 at 07:21:04PM +0200, Corinna Vinschen wrote:
> >On Wed, Sep 12, 2001 at 12:56:41PM -0400, Christopher Faylor wrote:
> >> On Wed, Sep 12, 2001 at 06:48:12PM +0200, Corinna Vinschen wrote:
> >> >On Wed, Sep 12, 2001 at 06:40:31PM +0200, Corinna Vinschen wrote:
> >> >> On Tue, Sep 11, 2001 at 10:00:11PM +1000, Robert Collins wrote:
> >> >> > +  if (iswinnt)
> >> >> > +    InitializeCriticalSection (&criticalsection);
> >> >> > +  else
> >> >> > +    {
> >> >> > +      this->win32_obj_id =::CreateMutex (&sec_none_nih, false, NULL);
> >> >> > +      if (!win32_obj_id)
> >> >> > +        magic = 0;
> >> >> > +    }
> >> >> 
> >> >> Could somebody give me a short hint why we're using critical
> >> >> sections on NT only?  I need some three word only description...
> >> >> something memorable...
> >> >
> >> >Whoops, is the fact that TryEnterCriticalSection() is only
> >> >available since NT4 the reason, perhaps???
> >> 
> >> Apparently.
> >> 
> >> Cygwin's muto class actually does a sort of critical section and has
> >> TryEnterCriticalSection capabilities.
> >> 
> >> I don't think that mutos are necessarily general purpose enough for
> >> this but maybe we could do something similar.  Or we could probably
> >> roll our own version of TryEnterCriticalSection.
> >
> >Don't worry.  I'm just asking to know how to name the new wincap
> >flag for that stuff. :-)
> 
> I *am* concerned about YA performance hit on Windows 9x, though.  I'd like
> to avoid that if possible.

No hit, its been like it is now since day 1. (Well actually there was
the process wide mutex serialisation when I first started hacking at it,
but thats long gone).

I just had the opportunity to make NT *faster*.

Rob