dom/crypto/WebCryptoThreadPool.cpp
author L10n Bumper Bot <release+l10nbumper@mozilla.com>
Thu, 08 Nov 2018 03:00:11 -0800
changeset 501100 1cd4f2d571554c4dc89cf1be1d98683c0d14f797
parent 495114 7b3509f26e05c171d0de8ee829545f86f84acb2e
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
no bug - Bumping Fennec l10n changesets r=release a=l10n-bump DONTBUILD an -> 336e061995b9 ar -> f6834a7d7374 as -> d2c76e616a66 ast -> fcb8f3455237 az -> c4caf3b07cf2 be -> 697eb1022498 bg -> 7bf1f448f743 bn-BD -> 5f7a87adee06 bn-IN -> 49ce3195c4c2 br -> 41cf35b7c5b5 bs -> 4a14aee27904 ca -> 9373e8ce86d4 cak -> a40d767541ba cs -> 4b99defb0525 cy -> 4c948fed2584 de -> 017a7e7a267a dsb -> aadebeccf5ba el -> 2d28a78dcef5 en-CA -> 55ad9171a9f0 en-GB -> 296422b495e9 en-ZA -> c1b5d2128914 eo -> c68e87667d9f es-AR -> bff0a788c711 es-CL -> 1d3efd2532ea es-ES -> 4d1feb70b0e2 es-MX -> fceda607d0f4 et -> 58a8262a0cc7 eu -> 7cebfd46208b fa -> cbc040d58476 ff -> 46f5aec275ea fi -> 235ab13d261e fr -> 8ee417b64f99

/* -*- 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 "mozilla/dom/WebCryptoThreadPool.h"

#include "MainThreadUtils.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "nsComponentManagerUtils.h"
#include "nsNSSComponent.h"
#include "nsXPCOMCIDInternal.h"
#include "nsXPCOMPrivate.h"
#include "nsIObserverService.h"
#include "nsThreadPool.h"

namespace mozilla {
namespace dom {

StaticRefPtr<WebCryptoThreadPool> gInstance;

NS_IMPL_ISUPPORTS(WebCryptoThreadPool, nsIObserver)

/* static */ void
WebCryptoThreadPool::Initialize()
{
  MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
  MOZ_ASSERT(!gInstance, "More than one instance!");

  gInstance = new WebCryptoThreadPool();
  NS_WARNING_ASSERTION(gInstance, "Failed create thread pool!");

  if (gInstance && NS_FAILED(gInstance->Init())) {
    NS_WARNING("Failed to initialize thread pool!");
    gInstance = nullptr;
  }
}

/* static */ nsresult
WebCryptoThreadPool::Dispatch(nsIRunnable* aRunnable)
{
  if (gInstance) {
    return gInstance->DispatchInternal(aRunnable);
  }

  // Fail if called on shutdown.
  return NS_ERROR_FAILURE;
}

nsresult
WebCryptoThreadPool::Init()
{
  MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  NS_ENSURE_TRUE(obs, NS_ERROR_FAILURE);

  // Need this observer to know when to shut down the thread pool.
  return obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
}

nsresult
WebCryptoThreadPool::DispatchInternal(nsIRunnable* aRunnable)
{
  MutexAutoLock lock(mMutex);

  if (mShutdown) {
    return NS_ERROR_FAILURE;
  }

  if (!mPool) {
    NS_ENSURE_TRUE(EnsureNSSInitializedChromeOrContent(), NS_ERROR_FAILURE);

    nsCOMPtr<nsIThreadPool> pool(new nsThreadPool());

    nsresult rv = pool->SetName(NS_LITERAL_CSTRING("SubtleCrypto"));
    NS_ENSURE_SUCCESS(rv, rv);

    pool.swap(mPool);
  }

  return mPool->Dispatch(aRunnable, NS_DISPATCH_NORMAL);
}

void
WebCryptoThreadPool::Shutdown()
{
  MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");

  // Limit the scope of locking to avoid deadlocking if DispatchInternal ends
  // up getting called during shutdown event processing.
  nsCOMPtr<nsIThreadPool> pool;
  {
    MutexAutoLock lock(mMutex);
    if (mShutdown) {
      return;
    }
    pool = mPool;
    mShutdown = true;
  }

  if (pool) {
    pool->Shutdown();
  }

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  NS_WARNING_ASSERTION(obs, "Failed to retrieve observer service!");

  if (obs) {
    if (NS_FAILED(obs->RemoveObserver(this,
                                      NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID))) {
      NS_WARNING("Failed to remove shutdown observer!");
    }
  }
}

NS_IMETHODIMP
WebCryptoThreadPool::Observe(nsISupports* aSubject,
                             const char* aTopic,
                             const char16_t* aData)
{
  MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");

  if (gInstance) {
    gInstance->Shutdown();
    gInstance = nullptr;
  }

  return NS_OK;
}

} // namespace dom
} // namespace mozilla