From patchwork Thu Oct 27 11:37:50 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 122121 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id CC96F1007D8 for ; Thu, 27 Oct 2011 22:58:44 +1100 (EST) Received: from localhost ([::1]:46320 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RJOI5-0003VO-7D for incoming@patchwork.ozlabs.org; Thu, 27 Oct 2011 07:38:33 -0400 Received: from eggs.gnu.org ([140.186.70.92]:46225) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RJOHW-0002FV-UW for qemu-devel@nongnu.org; Thu, 27 Oct 2011 07:38:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RJOHV-0007JA-4c for qemu-devel@nongnu.org; Thu, 27 Oct 2011 07:37:58 -0400 Received: from mnementh.archaic.org.uk ([81.2.115.146]:54657) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RJOHU-0007In-Sc for qemu-devel@nongnu.org; Thu, 27 Oct 2011 07:37:57 -0400 Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.72) (envelope-from ) id 1RJOHR-0004F9-0G; Thu, 27 Oct 2011 12:37:53 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Date: Thu, 27 Oct 2011 12:37:50 +0100 Message-Id: <1319715472-16286-2-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1319715472-16286-1-git-send-email-peter.maydell@linaro.org> References: <1319715472-16286-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 81.2.115.146 Cc: Paolo Bonzini , "Dr. David Alan Gilbert" , =?UTF-8?q?Andreas=20F=C3=A4rber?= , Jan Kiszka , patches@linaro.org Subject: [Qemu-devel] [PATCH v2 1/3] qemu-tls.h: Add abstraction layer for TLS variables X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add an abstraction layer for defining and using thread-local variables. For the moment this is implemented only for Linux, which means they can only be used in restricted circumstances. The abstraction layer allows us to add POSIX and Win32 support later. Signed-off-by: Peter Maydell Signed-off-by: Paolo Bonzini Reviewed-by: Andreas Färber --- qemu-tls.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 51 insertions(+), 0 deletions(-) create mode 100644 qemu-tls.h diff --git a/qemu-tls.h b/qemu-tls.h new file mode 100644 index 0000000..d96a159 --- /dev/null +++ b/qemu-tls.h @@ -0,0 +1,51 @@ +/* + * Abstraction layer for defining and using TLS variables + * + * Copyright (c) 2011 Red Hat, Inc, Linaro Limited + * + * Authors: + * Paolo Bonzini + * Peter Maydell + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ + +#ifndef QEMU_TLS_GCC_H +#define QEMU_TLS_GCC_H + +/* Per-thread variables. Note that we only have implementations + * which are really thread-local on Linux; the dummy implementations + * define plain global variables. + * + * This means that for the moment use should be restricted to + * per-VCPU variables, which are OK because: + * - the only -user mode supporting multiple VCPU threads is linux-user + * - TCG system mode is single-threaded regarding VCPUs + * - KVM system mode is multi-threaded but limited to Linux + * + * TODO: proper implementations via Win32 .tls sections and + * POSIX pthread_getspecific. + */ +#ifdef __linux__ +#define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x) +#define DEFINE_TLS(type, x) __thread __typeof__(type) tls__##x +#define get_tls(x) tls__##x +#else +/* Dummy implementations which define plain global variables */ +#define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x) +#define DEFINE_TLS(type, x) __typeof__(type) tls__##x +#define get_tls(x) tls__##x +#endif + +#endif