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[46.188.120.37]) by smtp.gmail.com with ESMTPSA id l79sm4420028lfi.40.2016.07.06.14.15.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 06 Jul 2016 14:15:09 -0700 (PDT) From: Sergey Fedorov To: qemu-devel@nongnu.org Date: Thu, 7 Jul 2016 00:14:53 +0300 Message-Id: <1467839703-11733-2-git-send-email-sergey.fedorov@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1467839703-11733-1-git-send-email-sergey.fedorov@linaro.org> References: <1467839703-11733-1-git-send-email-sergey.fedorov@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a00:1450:4010:c07::230 Subject: [Qemu-devel] [RFC v2 01/11] atomic: introduce atomic_dec_fetch. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: MTTCG Devel , Peter Maydell , Sergey Fedorov , Alvise Rigo , "Emilio G. Cota" , Paolo Bonzini , Richard Henderson , =?UTF-8?Q?Alex_Benn=c3=a9e?= , =?UTF-8?B?S09OUkFEIEZyw6lkw6lyaWM=?= Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Alex Bennée 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 7a590969b59f..8ac9ca7f457a 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -162,6 +162,8 @@ #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)) @@ -357,6 +359,8 @@ #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))