From owner-freebsd-questions@freebsd.org Tue Jul 13 03:55:38 2021 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 62848650FEC for ; Tue, 13 Jul 2021 03:55:38 +0000 (UTC) (envelope-from kh@panix.com) Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4GP6HF4pvZz3vsX for ; Tue, 13 Jul 2021 03:55:37 +0000 (UTC) (envelope-from kh@panix.com) Received: from rain.home (pool-96-230-243-2.bstnma.fios.verizon.net [96.230.243.2]) by mailbackend.panix.com (Postfix) with ESMTPSA id 4GP6HD6TYHz4LXG for ; Mon, 12 Jul 2021 23:55:36 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=panix.com; s=panix; t=1626148536; bh=lceJxu1zYt0jzzwtiFX/OBGfsjgIXuWjf+8lFypISfs=; h=Subject:To:References:From:Date:In-Reply-To; b=GWMi/5ZCCRNYeMg0WKOGpaIfbsCg+AgrLUaE1ctHm14ODW1Fnjp/x6x2bSHYEZZN8 h0OvMOGOs/RZR3JU9JsdrG/I6l15GVdsznMv8iqeIiwP8NYgvaC45s/U049WVtCw3L NLcBmcPsX1/C1BmxWennRawpLEjtRkt+MiIsWQJ8= Subject: Re: sys/timerfd.h missing To: freebsd-questions@freebsd.org References: <15b672e6-8f3b-4c6c-a42c-e955216f630b@wavecable.com> From: Kurt Hackenberg Message-ID: <3fefcffc-ad61-8336-f012-854b4c02a840@panix.com> Date: Mon, 12 Jul 2021 23:55:33 -0400 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4GP6HF4pvZz3vsX X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=panix.com header.s=panix header.b=GWMi/5ZC; dmarc=none; spf=pass (mx1.freebsd.org: domain of kh@panix.com designates 166.84.1.89 as permitted sender) smtp.mailfrom=kh@panix.com X-Spamd-Result: default: False [-3.16 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; RWL_MAILSPIKE_GOOD(0.00)[166.84.1.89:from]; R_SPF_ALLOW(-0.20)[+ip4:166.84.0.0/16]; TO_DN_NONE(0.00)[]; RCVD_DKIM_ARC_DNSWL_MED(-0.50)[]; RCVD_IN_DNSWL_MED(-0.20)[166.84.1.89:from]; DKIM_TRACE(0.00)[panix.com:+]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:2033, ipnet:166.84.0.0/16, country:US]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_PBL(0.00)[96.230.243.2:received]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.95)[-0.955]; R_DKIM_ALLOW(-0.20)[panix.com:s=panix]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; DMARC_NA(0.00)[panix.com]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_LOW(-1.00)[panix.com:dkim]; NEURAL_SPAM_SHORT(1.00)[0.997]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-questions] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Jul 2021 03:55:38 -0000 On 2021/07/12 22:23, Thomas D. Dean wrote: > I want to: > > start timer  /* >> loop execution time */ > do something > while(1) >   wait timer >   start timer   /* >> loop execution time */ >   do something >   do something else How about the C library function sleep()? Or for less than a second, usleep(3), nanosleep(2), or clock_nanosleep(2). You might also have a use for clock_gettime(2). All of those except usleep() are Posix.