From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 057BBC433F5 for ; Wed, 20 Apr 2022 14:38:50 +0000 (UTC) Received: from localhost ([::1]:59776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nhBTe-0000hM-RZ for qemu-devel@archiver.kernel.org; Wed, 20 Apr 2022 10:38:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49576) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nhB4f-0008LN-OC for qemu-devel@nongnu.org; Wed, 20 Apr 2022 10:12:54 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:25470) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nhB4c-00040v-MH for qemu-devel@nongnu.org; Wed, 20 Apr 2022 10:12:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1650463969; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=g4W/mipN+iRihErlszffqLbt0UZTVysHKaszWYNTArE=; b=gmfLhwziofEzKnQLxalg4R2RjnXjo4ZwG8Ly5etcaqJAwh/fwiVwx090qG4a+J3vK18dZ1 usg11ivCiwzD9DsbCcqExfo3gTJ96wmDzCd/AI+GwSRptZkGF0lw3ioF4Nh0oqq6WxSMxm aFZwko+sSYIw+BwxM75CLXizUb+a6tg= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-128-OnF6pU9sNaqEoniyTliCEg-1; Wed, 20 Apr 2022 10:12:47 -0400 X-MC-Unique: OnF6pU9sNaqEoniyTliCEg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E2D943C025C2; Wed, 20 Apr 2022 14:12:46 +0000 (UTC) Received: from localhost (unknown [10.39.194.99]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8EBEF4087D7F; Wed, 20 Apr 2022 14:12:46 +0000 (UTC) Date: Wed, 20 Apr 2022 16:12:45 +0200 From: Stefan Hajnoczi To: Florian Weimer Subject: Re: Portable inline asm to get address of TLS variable Message-ID: References: <87leyaznm6.fsf@oldenburg.str.redhat.com> <877d9uzgsd.fsf@oldenburg.str.redhat.com> <8735k1q452.fsf@oldenburg.str.redhat.com> <87lew12tr9.fsf@oldenburg.str.redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="+y36pZtpxs5zPAnO" Content-Disposition: inline In-Reply-To: <87lew12tr9.fsf@oldenburg.str.redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Rodgers , Stefan Hajnoczi , Richard Henderson , qemu-devel , Serge Guelton Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --+y36pZtpxs5zPAnO Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 19, 2022 at 01:32:42PM +0200, Florian Weimer wrote: > * Stefan Hajnoczi: >=20 > > On Tue, Mar 01, 2022 at 12:54:49PM +0100, Florian Weimer wrote: > >> > I took a quick look at C++20 coroutines since they are available in > >> > compilers but the primitives look hard to use even from C++, let alo= ne > >> > from C. > >>=20 > >> Could you go into details what makes them hard to use? Is it because > >> coroutines are infectious across the call stack? > > > > Here is the simplest tutorial on C++20 coroutines I found: > > https://itnext.io/c-20-coroutines-complete-guide-7c3fc08db89d > > > > The amount of boilerplate for trivial coroutine functions is ridiculous. >=20 > Would an execution agent library reduce that usage overhead? Paolo Bonzini wrote a proof-of-concept using C++20 coroutines: https://lore.kernel.org/all/20220314093203.1420404-1-pbonzini@redhat.com/ Stefan --+y36pZtpxs5zPAnO Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmJgFN0ACgkQnKSrs4Gr c8iU6wgAw9zzUXB9bN8XnM+NiaCU+clZEWdohFmR25R4FErxkvCkSXtz9ySrtj/R oN7nPB/Ieu+g5AdhCTQwU6L/XXzzUJbYGYirZZh6zamUvC5cDDiVGvRgb/8B4f/0 i50BhueT2lspz1Z/FX1caD2HFWUSQf9bLhQOdOwnTf+mI2WH2qTC5gFP6U5h1Ug1 2sKylpW4qSsJI1BY02/epfCOcJ7c/l+eDZRf/CiMK13OqX8hFerDN81YwhT4zyJJ WogMmSZDXonwthtAyuOADT5Yi2HqVEzHKrLqcCkepjMisR4zP36HxNiIvRSYl1GN yL2UZnqY+myvdyzcnQKGpDhSHCfrrQ== =ZT++ -----END PGP SIGNATURE----- --+y36pZtpxs5zPAnO--