From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36393) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUdTo-00089W-K8 for qemu-devel@nongnu.org; Tue, 02 Aug 2016 13:27:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bUdTk-0002QD-DB for qemu-devel@nongnu.org; Tue, 02 Aug 2016 13:27:47 -0400 Received: from mail-wm0-x22a.google.com ([2a00:1450:400c:c09::22a]:38884) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUdTj-0002Pm-VN for qemu-devel@nongnu.org; Tue, 02 Aug 2016 13:27:44 -0400 Received: by mail-wm0-x22a.google.com with SMTP id o80so300740569wme.1 for ; Tue, 02 Aug 2016 10:27:43 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Tue, 2 Aug 2016 18:27:32 +0100 Message-Id: <1470158864-17651-2-git-send-email-alex.bennee@linaro.org> In-Reply-To: <1470158864-17651-1-git-send-email-alex.bennee@linaro.org> References: <1470158864-17651-1-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 v5 01/13] atomic: introduce atomic_dec_fetch. 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 Cc: mark.burton@greensocs.com, pbonzini@redhat.com, jan.kiszka@siemens.com, rth@twiddle.net, peter.maydell@linaro.org, claudio.fontana@huawei.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Sergey Fedorov Useful for counting down. Signed-off-by: Alex Bennée Signed-off-by: Sergey Fedorov --- include/qemu/atomic.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index 7e13fca..560b1af 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -160,6 +160,8 @@ #define atomic_fetch_and(ptr, n) __atomic_fetch_and(ptr, n, __ATOMIC_SEQ_CST) #define atomic_fetch_or(ptr, n) __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST) +#define atomic_dec_fetch(ptr) __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST) + /* And even shorter names that return void. */ #define atomic_inc(ptr) ((void) __atomic_fetch_add(ptr, 1, __ATOMIC_SEQ_CST)) #define atomic_dec(ptr) ((void) __atomic_fetch_sub(ptr, 1, __ATOMIC_SEQ_CST)) @@ -355,6 +357,8 @@ #define atomic_fetch_or __sync_fetch_and_or #define atomic_cmpxchg __sync_val_compare_and_swap +#define atomic_dec_fetch(ptr) __sync_sub_and_fetch(ptr, 1) + /* And even shorter names that return void. */ #define atomic_inc(ptr) ((void) __sync_fetch_and_add(ptr, 1)) #define atomic_dec(ptr) ((void) __sync_fetch_and_add(ptr, -1)) -- 2.7.4