dom/serviceworkers/ServiceWorkerChild.cpp
author Nika Layzell <nika@thelayzells.com>
Thu, 06 Aug 2020 14:04:13 +0000
changeset 544125 ee09cb88af177571304759bc05c760e3d82fd1ed
parent 482561 7b84345b472574f780fcb890bdf718785b3396df
permissions -rw-r--r--
Bug 1656854 - Part 2: Add a BrowsingContextGroup keepalive to BrowserParent shutdown, r=farre In bug 1652085, I added BrowsingContextGroup keepalives while waiting for replies to the discard message, however that message isn't actually sent to the current owner process. Instead, the BrowsingContext is discarded by the PBrowser being destroyed. This should help ensure we also keep the group alive during normal BrowserParent destruction. Differential Revision: https://phabricator.services.mozilla.com/D85897

/* -*- 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/. */

#include "ServiceWorkerChild.h"
#include "mozilla/dom/WorkerRef.h"

namespace mozilla {
namespace dom {

void ServiceWorkerChild::ActorDestroy(ActorDestroyReason aReason) {
  mIPCWorkerRef = nullptr;

  if (mOwner) {
    mOwner->RevokeActor(this);
    MOZ_DIAGNOSTIC_ASSERT(!mOwner);
  }
}

// static
ServiceWorkerChild* ServiceWorkerChild::Create() {
  ServiceWorkerChild* actor = new ServiceWorkerChild();

  if (!NS_IsMainThread()) {
    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
    MOZ_DIAGNOSTIC_ASSERT(workerPrivate);

    RefPtr<IPCWorkerRefHelper<ServiceWorkerChild>> helper =
        new IPCWorkerRefHelper<ServiceWorkerChild>(actor);

    actor->mIPCWorkerRef = IPCWorkerRef::Create(
        workerPrivate, "ServiceWorkerChild",
        [helper] { helper->Actor()->MaybeStartTeardown(); });

    if (NS_WARN_IF(!actor->mIPCWorkerRef)) {
      delete actor;
      return nullptr;
    }
  }

  return actor;
}

ServiceWorkerChild::ServiceWorkerChild()
    : mOwner(nullptr), mTeardownStarted(false) {}

void ServiceWorkerChild::SetOwner(RemoteServiceWorkerImpl* aOwner) {
  MOZ_DIAGNOSTIC_ASSERT(!mOwner);
  MOZ_DIAGNOSTIC_ASSERT(aOwner);
  mOwner = aOwner;
}

void ServiceWorkerChild::RevokeOwner(RemoteServiceWorkerImpl* aOwner) {
  MOZ_DIAGNOSTIC_ASSERT(mOwner);
  MOZ_DIAGNOSTIC_ASSERT(aOwner == mOwner);
  mOwner = nullptr;
}

void ServiceWorkerChild::MaybeStartTeardown() {
  if (mTeardownStarted) {
    return;
  }
  mTeardownStarted = true;
  Unused << SendTeardown();
}

}  // namespace dom
}  // namespace mozilla