From 6373a87315191325e67ee9e49af6d965de02df66 Mon Sep 17 00:00:00 2001 From: Tim Wiederhake Date: Mon, 23 Aug 2021 14:47:25 +0200 Subject: [PATCH] virobject: Introduce VIR_WITH_OBJECT_LOCK_GUARD MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Martin Kletzander Reviewed-by: Daniel P. Berrangé --- 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 = virObjectLockGuard(o); name.mutex; \ + name.mutex = (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 leave + * the scope early and release the lock. + * + * virObjectLockable *lockable = ...; + * + * VIR_WITH_OBJECT_LOCK_GUARD(lockable) { + * // `lockable` is locked, and released automatically on scope exit + * ... + * } + */ +#define VIR_WITH_OBJECT_LOCK_GUARD(o) \ + VIR_WITH_OBJECT_LOCK_GUARD_(o, CONCAT(var, __COUNTER__))