1 files changed, 119 insertions, 0 deletions
diff --git a/dom/crypto/WebCryptoThreadPool.cpp b/dom/crypto/WebCryptoThreadPool.cpp
new file mode 100644
index 000000000..6a1e78608
--- /dev/null
+++ b/dom/crypto/WebCryptoThreadPool.cpp
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "nsComponentManagerUtils.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsXPCOMPrivate.h"
+#include "nsIObserverService.h"
+#include "nsIThreadPool.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 (!mPool) {
+    NS_ENSURE_TRUE(EnsureNSSInitializedChromeOrContent(), NS_ERROR_FAILURE);
+
+    nsCOMPtr<nsIThreadPool> pool(do_CreateInstance(NS_THREADPOOL_CONTRACTID));
+    NS_ENSURE_TRUE(pool, NS_ERROR_FAILURE);
+
+    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!");
+  MutexAutoLock lock(mMutex);
+
+  if (mPool) {
+    mPool->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