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diff --git a/dom/locks/LockRequestChild.h b/dom/locks/LockRequestChild.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_LOCKREQUESTCHILD_H_
+#define DOM_LOCKS_LOCKREQUESTCHILD_H_
+
+#include "LockManagerChild.h"
+#include "mozilla/dom/locks/PLockRequestChild.h"
+#include "mozilla/dom/Lock.h"
+#include "mozilla/dom/WorkerRef.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla::dom::locks {
+
+struct LockRequest {
+ nsString mName;
+ RefPtr<Promise> mPromise;
+ RefPtr<LockGrantedCallback> mCallback;
+};
+
+class LockRequestChild final : public PLockRequestChild,
+ public AbortFollower,
+ public SupportsWeakPtr {
+ using IPCResult = mozilla::ipc::IPCResult;
+
+ NS_DECL_ISUPPORTS
+
+ public:
+ explicit LockRequestChild(
+ const LockRequest& aRequest,
+ const Optional<OwningNonNull<AbortSignal>>& aSignal);
+
+ void MaybeSetWorkerRef();
+
+ // TODO: Use MOZ_CAN_RUN_SCRIPT when it gains IPDL support (bug 1539864)
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY IPCResult RecvResolve(const LockMode& aLockMode,
+ bool aIsAvailable);
+ IPCResult Recv__delete__(bool aAborted);
+
+ void ActorDestroy(ActorDestroyReason aReason) final;
+
+ void RunAbortAlgorithm() final;
+
+ private:
+ ~LockRequestChild() = default;
+
+ LockManagerChild* CastedManager() const;
+
+ const LockRequest mRequest;
+
+ // This prevents the worker from being GC'ed when the caller is waiting to
+ // acquire the lock and when the lock is held.
+ //
+ // The StrongWorkerRef is dropped immediately in the shutdown notification
+ // callback, and thus does not ensure any cleanup before the worker advances
+ // to the Killing state. That is ensured instead by
+ // LockManagerChild::mWorkerRef, see also the details there.
+ RefPtr<StrongWorkerRef> mWorkerRef;
+};
+
+} // namespace mozilla::dom::locks
+
+#endif // DOM_LOCKS_LOCKREQUESTCHILD_H_