Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751109AbVJFPn0 (ORCPT ); Thu, 6 Oct 2005 11:43:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751100AbVJFPn0 (ORCPT ); Thu, 6 Oct 2005 11:43:26 -0400 Received: from ns.firmix.at ([62.141.48.66]:22686 "EHLO ns.firmix.at") by vger.kernel.org with ESMTP id S1751111AbVJFPnY (ORCPT ); Thu, 6 Oct 2005 11:43:24 -0400 Subject: Re: select(0,NULL,NULL,NULL,&t1) used for delay From: Bernd Petrovitsch To: Christopher Friesen Cc: Alex Riesen , linux-kernel@vger.kernel.org In-Reply-To: <43454238.4040907@nortel.com> References: <1128606546.14385.26.camel@penguin.madhu> <81b0412b0510060727h35c0fd78i260037ca89f253f9@mail.gmail.com> <43454238.4040907@nortel.com> Content-Type: text/plain Organization: Firmix Software GmbH Date: Thu, 06 Oct 2005 17:42:50 +0200 Message-Id: <1128613370.6630.5.camel@tara.firmix.at> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1340 Lines: 36 On Thu, 2005-10-06 at 09:26 -0600, Christopher Friesen wrote: > Alex Riesen wrote: > > > Why don't you just use nanosleep(2) (or usleep)? > > I can think of one main reason...existing code. Also, nanosleep() And it's cooler to hack the kernel than to create and use a portable_sleep() function and use it. > rounds up excessively in many kernel versions, so that a request to > sleep for less than 1 tick ends up sleeping for 2 ticks. ^^^^^^^ > The select() man page explicitly mentions this usage; > > "Some code calls select with all three sets empty, n zero, and a > non-null timeout as a fairly portable way to sleep with subsecond ^^^^^^^^^ > precision." ^^^^^^^^^ You do realize that "subsecond precision" is probably meant as improvement to sleep(3) and surely not to nanosleep(2)? Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/