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_