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[78.12.184.244]) by smtp.gmail.com with ESMTPSA id v6-v6sm2608955wmc.43.2018.08.21.10.03.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Aug 2018 10:03:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id:in-reply-to:references; bh=l0P8/+Ftl94kQbsmsYfEnhMeyEaW7zmUBZ3s37Urs14=; b=gRhFQ2VX0qXs2srnnmuR5zXyn/DLtpvBYMmjkCE2R97PilAZQgloseM2xrM6AK4VgJ KvHcsw+0RkgTvjPEmG/RWU5V6nokkI4iISVfoswPYi977bEWUhqIPCYKR5K3UMJoaDmJ BJuli9tgd4uee2bPiB3CXjhiPMrEKoUpqCzwCPapaU1dHovOqcV8VnpGQmsxAC8gtfFr I/g2Pi8PEbTRdcVOTA05pOzE7to0qoyrrb5z4ITDOIs+iU93hJSkwG99MHB4EuEdskv+ IKDXXALXEvIBrF83FC79TLKE3CNa/Gl/E/UXK/t5epl3wgVHwhWqZb+IGikXWKn58Olj fEoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id :in-reply-to:references; bh=l0P8/+Ftl94kQbsmsYfEnhMeyEaW7zmUBZ3s37Urs14=; b=Ol2+vWbTLQe25xvowWUy0siuvSba8RPTygQRPChb8TzJ3i7R38Rf6agSuwUvSbgyiM wzFxDfPVJxDiuCco9BO1f06hl/vDPJi8ezm1mkenbLykRifRKN9pklV2Xc7PRwowDJgO Jybx41t3UUBWyj+FnCUgvHvlCIOzGaPSztWtGgYdIUroYC6/S1ykD35wyNIMj6uAlvoW UiJaMi63RiHqHSypZEnP6jsGrMjwrgnW63hNuBoCiCtN60jUsnGXC2Bp6IEs8emIwDxM Y9W4OBWkK9YlM04x3MISiHBmmK4KX6qIQYqGBfvox2H1huPcUI9NbnfaK9dZYdGLDmOI KAbw== X-Gm-Message-State: APzg51CEsN9PgQidwPxk7Z79+Q4XvZG1nZBHH5NAoC1s0L2rTl9acqRM S2fWu3uiYYBZxk6B7Ft9/6nb0NYl X-Google-Smtp-Source: ANB0VdY0fJGAalDN2s7rTKoits9zl/OsuSctvAms/YqdIcQ8DWVZ83Oss2yYqGlDxuEICssllDO7zw== X-Received: by 2002:a1c:8893:: with SMTP id k141-v6mr164868wmd.36.1534871038169; Tue, 21 Aug 2018 10:03:58 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Tue, 21 Aug 2018 19:02:23 +0200 Message-Id: <1534870966-9287-52-git-send-email-pbonzini@redhat.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1534870966-9287-1-git-send-email-pbonzini@redhat.com> References: <1534870966-9287-1-git-send-email-pbonzini@redhat.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:400c:c09::241 Subject: [Qemu-devel] [PULL 51/74] seqlock: add QemuLockable support 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" A shortcut when the seqlock write is protected by a spinlock or any mutex other than the BQL. Signed-off-by: Paolo Bonzini --- include/qemu/seqlock.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/qemu/seqlock.h b/include/qemu/seqlock.h index c367516..fd408b7 100644 --- a/include/qemu/seqlock.h +++ b/include/qemu/seqlock.h @@ -16,6 +16,7 @@ =20 #include "qemu/atomic.h" #include "qemu/thread.h" +#include "qemu/lockable.h" =20 typedef struct QemuSeqLock QemuSeqLock; =20 @@ -45,6 +46,25 @@ static inline void seqlock_write_end(QemuSeqLock *sl) atomic_set(&sl->sequence, sl->sequence + 1); } =20 +/* Lock out other writers and update the count. */ +static inline void seqlock_write_lock_impl(QemuSeqLock *sl, QemuLockable *= lock) +{ + qemu_lockable_lock(lock); + seqlock_write_begin(sl); +} +#define seqlock_write_lock(sl, lock) \ + seqlock_write_lock_impl(sl, QEMU_MAKE_LOCKABLE(lock)) + +/* Lock out other writers and update the count. */ +static inline void seqlock_write_unlock_impl(QemuSeqLock *sl, QemuLockable= *lock) +{ + qemu_lockable_unlock(lock); + seqlock_write_begin(sl); +} +#define seqlock_write_unlock(sl, lock) \ + seqlock_write_unlock_impl(sl, QEMU_MAKE_LOCKABLE(lock)) + + static inline unsigned seqlock_read_begin(const QemuSeqLock *sl) { /* Always fail if a write is in progress. */ --=20 1.8.3.1