From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56611) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKT3F-00079g-VQ for qemu-devel@nongnu.org; Tue, 05 Jul 2016 12:18:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bKT3D-0001xa-VG for qemu-devel@nongnu.org; Tue, 05 Jul 2016 12:18:20 -0400 Received: from mail-wm0-x233.google.com ([2a00:1450:400c:c09::233]:37656) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKT3D-0001xM-O3 for qemu-devel@nongnu.org; Tue, 05 Jul 2016 12:18:19 -0400 Received: by mail-wm0-x233.google.com with SMTP id a66so159713475wme.0 for ; Tue, 05 Jul 2016 09:18:19 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Tue, 5 Jul 2016 17:18:15 +0100 Message-Id: <1467735496-16256-6-git-send-email-alex.bennee@linaro.org> In-Reply-To: <1467735496-16256-1-git-send-email-alex.bennee@linaro.org> References: <1467735496-16256-1-git-send-email-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v2 5/6] tcg: introduce tb_lock_recursive() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: mttcg@listserver.greensocs.com, qemu-devel@nongnu.org, fred.konrad@greensocs.com, a.rigo@virtualopensystems.com, serge.fdrv@gmail.com, cota@braap.org, bobby.prani@gmail.com, rth@twiddle.net Cc: mark.burton@greensocs.com, pbonzini@redhat.com, jan.kiszka@siemens.com, peter.maydell@linaro.org, claudio.fontana@huawei.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Peter Crosthwaite In some cases it is useful to have a recursive lock that can be safely taken when nested in other critical regions. Rather than make all tb_locks() recursive having a separate function serves to notify the reader that it explicitly a possibility in this case. Signed-off-by: Alex Bennée --- tcg/tcg.h | 1 + translate-all.c | 11 +++++++++++ 2 files changed, 12 insertions(+) diff --git a/tcg/tcg.h b/tcg/tcg.h index 66d7fc0..62e4ced 100644 --- a/tcg/tcg.h +++ b/tcg/tcg.h @@ -647,6 +647,7 @@ void tcg_pool_reset(TCGContext *s); void tcg_pool_delete(TCGContext *s); void tb_lock(void); +bool tb_lock_recursive(void); void tb_unlock(void); void tb_lock_reset(void); diff --git a/translate-all.c b/translate-all.c index 97e834a..414bc7e 100644 --- a/translate-all.c +++ b/translate-all.c @@ -134,6 +134,17 @@ void tb_lock(void) #endif } +bool tb_lock_recursive(void) +{ +#ifdef CONFIG_USER_ONLY + if (have_tb_lock) { + return false; + } + tb_lock(); +#endif + return true; +} + void tb_unlock(void) { #ifdef CONFIG_USER_ONLY -- 2.7.4