From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60407) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8ZKO-0005vL-Nl for qemu-devel@nongnu.org; Thu, 02 Jun 2016 16:34:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b8ZKI-0001ar-NT for qemu-devel@nongnu.org; Thu, 02 Jun 2016 16:34:51 -0400 Received: from mail-lf0-x242.google.com ([2a00:1450:4010:c07::242]:33997) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8ZKI-0001aQ-FA for qemu-devel@nongnu.org; Thu, 02 Jun 2016 16:34:46 -0400 Received: by mail-lf0-x242.google.com with SMTP id 65so6196697lfq.1 for ; Thu, 02 Jun 2016 13:34:46 -0700 (PDT) References: <1460730231-1184-1-git-send-email-alex.bennee@linaro.org> <1460730231-1184-6-git-send-email-alex.bennee@linaro.org> From: Sergey Fedorov Message-ID: <57509863.4010704@gmail.com> Date: Thu, 2 Jun 2016 23:34:43 +0300 MIME-Version: 1.0 In-Reply-To: <1460730231-1184-6-git-send-email-alex.bennee@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] [RFC v1 04/12] atomic: introduce atomic_dec_fetch. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , mttcg@listserver.greensocs.com, fred.konrad@greensocs.com, a.rigo@virtualopensystems.com, cota@braap.org Cc: qemu-devel@nongnu.org, mark.burton@greensocs.com, pbonzini@redhat.com, jan.kiszka@siemens.com, rth@twiddle.net, peter.maydell@linaro.org, claudio.fontana@huawei.com On 15/04/16 17:23, Alex Bennée wrote: > Useful for counting down. > > Signed-off-by: Alex Bennée Reviewed-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 8f1d8d9..5dba7db 100644 > --- a/include/qemu/atomic.h > +++ b/include/qemu/atomic.h > @@ -131,6 +131,8 @@ > #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)) > @@ -326,6 +328,8 @@ > #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))