133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/WebCryptoThreadPool.h"
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#include "mozilla/Services.h"
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#include "mozilla/StaticPtr.h"
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#include "nsComponentManagerUtils.h"
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#include "nsXPCOMCIDInternal.h"
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#include "nsXPCOMPrivate.h"
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#include "nsIObserverService.h"
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#include "nsIThreadPool.h"
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namespace mozilla {
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namespace dom {
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StaticRefPtr<WebCryptoThreadPool> gInstance;
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NS_IMPL_ISUPPORTS(WebCryptoThreadPool, nsIObserver)
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/* static */ void
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WebCryptoThreadPool::Initialize()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
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MOZ_ASSERT(!gInstance, "More than one instance!");
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gInstance = new WebCryptoThreadPool();
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NS_WARN_IF_FALSE(gInstance, "Failed create thread pool!");
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if (gInstance && NS_FAILED(gInstance->Init())) {
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NS_WARNING("Failed to initialize thread pool!");
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gInstance = nullptr;
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}
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}
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/* static */ nsresult
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WebCryptoThreadPool::Dispatch(nsIRunnable* aRunnable)
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{
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if (gInstance) {
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return gInstance->DispatchInternal(aRunnable);
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}
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// Fail if called on shutdown.
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return NS_ERROR_FAILURE;
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}
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nsresult
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WebCryptoThreadPool::Init()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
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nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
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NS_ENSURE_TRUE(obs, NS_ERROR_FAILURE);
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// Need this observer to know when to shut down the thread pool.
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return obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
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}
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nsresult
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WebCryptoThreadPool::DispatchInternal(nsIRunnable* aRunnable)
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{
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MutexAutoLock lock(mMutex);
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if (mShutdown) {
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return NS_ERROR_FAILURE;
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}
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if (!mPool) {
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nsCOMPtr<nsIThreadPool> pool(do_CreateInstance(NS_THREADPOOL_CONTRACTID));
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NS_ENSURE_TRUE(pool, NS_ERROR_FAILURE);
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nsresult rv = pool->SetName(NS_LITERAL_CSTRING("SubtleCrypto"));
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NS_ENSURE_SUCCESS(rv, rv);
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pool.swap(mPool);
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}
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return mPool->Dispatch(aRunnable, NS_DISPATCH_NORMAL);
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}
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void
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WebCryptoThreadPool::Shutdown()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
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// Limit the scope of locking to avoid deadlocking if DispatchInternal ends
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// up getting called during shutdown event processing.
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nsCOMPtr<nsIThreadPool> pool;
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{
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MutexAutoLock lock(mMutex);
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if (mShutdown) {
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return;
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}
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pool = mPool;
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mShutdown = true;
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}
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if (pool) {
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pool->Shutdown();
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}
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nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
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NS_WARN_IF_FALSE(obs, "Failed to retrieve observer service!");
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if (obs) {
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if (NS_FAILED(obs->RemoveObserver(this,
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NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID))) {
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NS_WARNING("Failed to remove shutdown observer!");
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}
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}
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}
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NS_IMETHODIMP
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WebCryptoThreadPool::Observe(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aData)
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{
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MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
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if (gInstance) {
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gInstance->Shutdown();
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gInstance = nullptr;
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}
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return NS_OK;
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}
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} // namespace dom
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} // namespace mozilla
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