1 files changed, 66 insertions, 0 deletions
diff --git a/dom/locks/LockRequestChild.h b/dom/locks/LockRequestChild.h
new file mode 100644
index 0000000000..8ea3b5f6e5
--- /dev/null
+++ b/dom/locks/LockRequestChild.h
@@ -0,0 +1,66 @@
+/* -*- 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_