From owner-freebsd-hackers Sat Jun 3 09:22:26 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id JAA01151 for hackers-outgoing; Sat, 3 Jun 1995 09:22:26 -0700 Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id JAA01145 for ; Sat, 3 Jun 1995 09:22:23 -0700 Received: from sax.sax.de by irz301.inf.tu-dresden.de with SMTP (5.67b+/DEC-Ultrix/4.3) id AA08771; Sat, 3 Jun 1995 17:53:14 +0200 Received: by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id RAA22707 for freebsd-hackers@freebsd.org; Sat, 3 Jun 1995 17:53:12 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.6.11/8.6.9) id QAA19306 for freebsd-hackers@freebsd.org; Sat, 3 Jun 1995 16:58:34 +0200 From: J Wunsch Message-Id: <199506031458.QAA19306@uriah.heep.sax.de> Subject: Re: SYSVSHM & X11 To: freebsd-hackers@freebsd.org (FreeBSD hackers) Date: Sat, 3 Jun 1995 16:58:32 +0200 (MET DST) Reply-To: freebsd-hackers@freebsd.org (FreeBSD hackers) In-Reply-To: <199505172105.XAA00243@yedi.iaf.nl> from "Wilko Bulte" at May 17, 95 11:05:48 pm Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) X-Phone: +49-351-2012 669 X-Mailer: ELM [version 2.4 PL23] Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Content-Length: 734 Sender: hackers-owner@freebsd.org Precedence: bulk As Wilko Bulte wrote: > > This might be a stupid question.. > > Xfree uses SYSVSHM when available to speedup things. This is a wrong conclusion. All the MITSHM extension does is to provide a second interface for transferring images between the client and the server, i.e. there's a second set of functions for XGetImage()/XPutImage() using the MITSHM extension. This is to say you: o the client must be aware of the MITSHM extension in order to use it o don't confuse this with a shm-based local transport protocol some commercial vendors have implemented into their servers -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ Never trust an operating system you don't have sources for. ;-)