[libvirt PATCH v5 5/9] virobject: Introduce VIR_WITH_OBJECT_LOCK_GUARD
Modeled after "WITH_QEMU_LOCK_GUARD" (see qemu's include/qemu/lockable.h).
See comment for typical usage.
Signed-off-by: Tim Wiederhake <twiederh(a)redhat.com>
---
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__))
--
2.31.1