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t=1643721815; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=vxpLRa/wFN+8yLIR/vK2WQTowPrxzSVgDvFumXduO/o=; b=YiyIWla1iHf9nsQObaa3k1VMFBPgazjOgpdyG3PogrYFlg3A69rGtpqqHQu65R4vx1RptH KPTGo6dNAL4FKOvYZNJK6+oONBNM3G9y+QCJecW+Gj34usMttBPHlQn7Q2tAfqyuRRgQt6 nXszbLDCmtAvACdAn4DQxgdKNjNQ4lA= X-MC-Unique: X5qAQEK4OcisPTG0NzrExg-1 From: Tim Wiederhake To: libvir-list@redhat.com Subject: [libvirt PATCH v5 5/9] virobject: Introduce VIR_WITH_OBJECT_LOCK_GUARD Date: Tue, 1 Feb 2022 14:20:13 +0100 Message-Id: <20220201132017.53963-6-twiederh@redhat.com> In-Reply-To: <20220201132017.53963-1-twiederh@redhat.com> References: <20220201132017.53963-1-twiederh@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-loop: libvir-list@redhat.com Cc: Tim Wiederhake X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=libvir-list-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1643721817921100001 Content-Type: text/plain; charset="utf-8" Modeled after "WITH_QEMU_LOCK_GUARD" (see qemu's include/qemu/lockable.h). See comment for typical usage. Signed-off-by: Tim Wiederhake Reviewed-by: Daniel P. Berrang=C3=A9 --- src/util/virobject.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/src/util/virobject.h b/src/util/virobject.h index dc1ce66a4f..a1e16aee77 100644 --- a/src/util/virobject.h +++ b/src/util/virobject.h @@ -148,3 +148,25 @@ virObjectListFree(void *list); void virObjectListFreeCount(void *list, size_t count); + +#define VIR_WITH_OBJECT_LOCK_GUARD_(o, name) \ + for (g_auto(virLockGuard) name =3D virObjectLockGuard(o); name.mutex; \ + name.mutex =3D (virLockGuardUnlock(&name), NULL)) + +/** + * VIR_WITH_OBJECT_LOCK_GUARD: + * + * This macro defines a lock scope such that entering the scope takes the = lock + * and leaving the scope releases the lock. Return statements are allowed + * within the scope and release the lock. Break and continue statements le= ave + * the scope early and release the lock. + * + * virObjectLockable *lockable =3D ...; + * + * VIR_WITH_OBJECT_LOCK_GUARD(lockable) { + * // `lockable` is locked, and released automatically on scope ex= it + * ... + * } + */ +#define VIR_WITH_OBJECT_LOCK_GUARD(o) \ + VIR_WITH_OBJECT_LOCK_GUARD_(o, CONCAT(var, __COUNTER__)) --=20 2.31.1