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Date: Mon, 6 Dec 1999 16:48:43 -0500
From: Chris Faylor <cgf AT cygnus DOT com>
To: Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>,
        stefan <stefan AT linux DOT f1 DOT fhtw-berlin DOT de>, cygwin AT sourceware DOT cygnus DOT com
Subject: Re: More than 64 sockets ?
Message-ID: <19991206164843.B9747@cygnus.com>
Mail-Followup-To: Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>,
	stefan <stefan AT linux DOT f1 DOT fhtw-berlin DOT de>,
	cygwin AT sourceware DOT cygnus DOT com
References: <Pine DOT LNX DOT 4 DOT 10 DOT 9912052255370 DOT 691-100000 AT bono DOT reversers DOT net> <199912061554 DOT JAA15146 AT hp2 DOT xraylith DOT wisc DOT edu> <19991206161728 DOT C2223 AT cygnus DOT com>
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In-Reply-To: <19991206161728.C2223@cygnus.com>; from cgf@cygnus.com on Mon, Dec 06, 1999 at 04:17:28PM -0500

On Mon, Dec 06, 1999 at 04:17:28PM -0500, Chris Faylor wrote:
>On Mon, Dec 06, 1999 at 09:54:39AM -0600, Mumit Khan wrote:
>>stefan <stefan AT linux DOT f1 DOT fhtw-berlin DOT de> writes:
>>> Hello,
>>> 
>>> we were porting a server software to Win9x/NT and had to notice that you
>>> cannot accept() more than 64 sockets. Why is this ? Can anyone help us ?
>>
>>The underlying OS API, WaitForMultipleObjects, has a limit of 64 handles
>>it can wait on, and that's probably the reason. There are tricks to get
>>around it, but it requires creating multiple threads. Not pretty.
>
>This isn't a problem with cygwin.  Cygwin uses the Winsock select() for
>sockets.  There probably is a limit there but it's not 64.

Just to clarify:  The "This" above refers to the WaitForMultipleObjects
limit of 64 handles.  This particular hard limit probably does not affect
cygwin.

There is a hard-coded limit in winsock.h which is probably what is coming
to play here.

cgf

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