1 files changed, 65 insertions, 0 deletions
diff --git a/dom/locks/LockManagerChild.h b/dom/locks/LockManagerChild.h
new file mode 100644
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--- /dev/null
+++ b/dom/locks/LockManagerChild.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_LOCKS_LOCKMANAGERCHILD_H_
+#define DOM_LOCKS_LOCKMANAGERCHILD_H_
+
+#include "mozilla/dom/locks/PLockManagerChild.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/WorkerRef.h"
+#include "nsIUUIDGenerator.h"
+
+namespace mozilla::dom::locks {
+
+struct LockRequest;
+
+class LockManagerChild final : public PLockManagerChild {
+ public:
+  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(LockManagerChild)
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(LockManagerChild)
+
+  static void NotifyBFCacheOnMainThread(nsPIDOMWindowInner* aInner,
+                                        bool aCreated);
+
+  explicit LockManagerChild(nsIGlobalObject* aOwner);
+
+  nsIGlobalObject* GetParentObject() const { return mOwner; };
+
+  void RequestLock(const LockRequest& aRequest, const LockOptions& aOptions);
+
+  void NotifyRequestDestroy() const;
+
+  void NotifyToWindow(bool aCreated) const;
+
+ private:
+  ~LockManagerChild() = default;
+
+  nsCOMPtr<nsIGlobalObject> mOwner;
+
+  // This WorkerRef is deleted by destructor.
+  //
+  // Here we want to make sure the IPC layer deletes the actor before allowing
+  // WorkerPrivate deletion, since managed LockRequestChild holds a reference to
+  // global object (currently via mRequest member variable) and thus deleting
+  // the worker first causes an assertion failure. Having this ensures that all
+  // LockRequestChild instances must first have been deleted.
+  //
+  // (Because each LockRequestChild's ActorLifecycleProxy will hold
+  // a strong reference to its manager LockManagerChild's ActorLifecycleProxy,
+  // which means that the LockManagerChild will only be destroyed once all
+  // LockRequestChild instances have been destroyed. At that point, all
+  // references to the global should have been dropped, and then the
+  // LockManagerChild IPCWorkerRef will be dropped and the worker will be able
+  // to transition to the Killing state.)
+  //
+  // ActorDestroy can't release this since it does not guarantee to destruct and
+  // GC the managees (LockRequestChild) immediately.
+  RefPtr<IPCWorkerRef> mWorkerRef;
+};
+
+}  // namespace mozilla::dom::locks
+
+#endif  // DOM_LOCKS_LOCKMANAGERCHILD_H_