The Tor Browser: comparison content/media/webaudio/blink/HRTFDatabaseLoader.cpp

--1:000000000000
+:98342e524614
+/*
+* Copyright (C) 2010 Google Inc. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* 1.  Redistributions of source code must retain the above copyright
+*     notice, this list of conditions and the following disclaimer.
+* 2.  Redistributions in binary form must reproduce the above copyright
+*     notice, this list of conditions and the following disclaimer in the
+*     documentation and/or other materials provided with the distribution.
+* 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+*     its contributors may be used to endorse or promote products derived
+*     from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#include "HRTFDatabaseLoader.h"
+#include "HRTFDatabase.h"
+using namespace mozilla;
+namespace WebCore {
+// Singleton
+nsTHashtable<HRTFDatabaseLoader::LoaderByRateEntry>*
+HRTFDatabaseLoader::s_loaderMap = nullptr;
+TemporaryRef<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
+{
+MOZ_ASSERT(NS_IsMainThread());
+RefPtr<HRTFDatabaseLoader> loader;
+if (!s_loaderMap) {
+s_loaderMap = new nsTHashtable<LoaderByRateEntry>();
+}
+LoaderByRateEntry* entry = s_loaderMap->PutEntry(sampleRate);
+loader = entry->mLoader;
+if (loader) { // existing entry
+MOZ_ASSERT(sampleRate == loader->databaseSampleRate());
+return loader;
+}
+loader = new HRTFDatabaseLoader(sampleRate);
+entry->mLoader = loader;
+loader->loadAsynchronously();
+return loader;
+}
+HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
+: m_refCnt(0)
+, m_threadLock("HRTFDatabaseLoader")
+, m_databaseLoaderThread(nullptr)
+, m_databaseSampleRate(sampleRate)
+{
+MOZ_ASSERT(NS_IsMainThread());
+}
+HRTFDatabaseLoader::~HRTFDatabaseLoader()
+{
+MOZ_ASSERT(NS_IsMainThread());
+waitForLoaderThreadCompletion();
+m_hrtfDatabase.reset();
+if (s_loaderMap) {
+// Remove ourself from the map.
+s_loaderMap->RemoveEntry(m_databaseSampleRate);
+if (s_loaderMap->Count() == 0) {
+delete s_loaderMap;
+s_loaderMap = nullptr;
+}
+}
+}
+size_t HRTFDatabaseLoader::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+size_t amount = aMallocSizeOf(this);
+// NB: Need to make sure we're not competing with the loader thread.
+const_cast<HRTFDatabaseLoader*>(this)->waitForLoaderThreadCompletion();
+if (m_hrtfDatabase) {
+amount += m_hrtfDatabase->sizeOfIncludingThis(aMallocSizeOf);
+}
+return amount;
+}
+class HRTFDatabaseLoader::ProxyReleaseEvent MOZ_FINAL : public nsRunnable {
+public:
+explicit ProxyReleaseEvent(HRTFDatabaseLoader* loader) : mLoader(loader) {}
+NS_IMETHOD Run() MOZ_OVERRIDE
+{
+mLoader->MainThreadRelease();
+return NS_OK;
+}
+private:
+HRTFDatabaseLoader* mLoader;
+};
+void HRTFDatabaseLoader::ProxyRelease()
+{
+nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
+if (MOZ_LIKELY(mainThread)) {
+nsRefPtr<ProxyReleaseEvent> event = new ProxyReleaseEvent(this);
+DebugOnly<nsresult> rv =
+mainThread->Dispatch(event, NS_DISPATCH_NORMAL);
+MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to dispatch release event");
+} else {
+// Should be in XPCOM shutdown.
+MOZ_ASSERT(NS_IsMainThread(),
+"Main thread is not available for dispatch.");
+MainThreadRelease();
+}
+}
+void HRTFDatabaseLoader::MainThreadRelease()
+{
+MOZ_ASSERT(NS_IsMainThread());
+int count = --m_refCnt;
+MOZ_ASSERT(count >= 0, "extra release");
+NS_LOG_RELEASE(this, count, "HRTFDatabaseLoader");
+if (count == 0) {
+// It is safe to delete here as the first reference can only be added
+// on this (main) thread.
+delete this;
+}
+}
+// Asynchronously load the database in this thread.
+static void databaseLoaderEntry(void* threadData)
+{
+PR_SetCurrentThreadName("HRTFDatabaseLdr");
+HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData);
+MOZ_ASSERT(loader);
+loader->load();
+}
+void HRTFDatabaseLoader::load()
+{
+MOZ_ASSERT(!NS_IsMainThread());
+MOZ_ASSERT(!m_hrtfDatabase.get(), "Called twice");
+// Load the default HRTF database.
+m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
+// Notifies the main thread of completion.  See loadAsynchronously().
+Release();
+}
+void HRTFDatabaseLoader::loadAsynchronously()
+{
+MOZ_ASSERT(NS_IsMainThread());
+MOZ_ASSERT(m_refCnt, "Must not be called before a reference is added");
+// Add a reference so that the destructor won't run and wait for the
+// loader thread, until load() has completed.
+AddRef();
+MutexAutoLock locker(m_threadLock);
+MOZ_ASSERT(!m_hrtfDatabase.get() && !m_databaseLoaderThread,
+"Called twice");
+// Start the asynchronous database loading process.
+m_databaseLoaderThread =
+PR_CreateThread(PR_USER_THREAD, databaseLoaderEntry, this,
+PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
+PR_JOINABLE_THREAD, 0);
+}
+bool HRTFDatabaseLoader::isLoaded() const
+{
+return m_hrtfDatabase.get();
+}
+void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
+{
+MutexAutoLock locker(m_threadLock);
+// waitForThreadCompletion() should not be called twice for the same thread.
+if (m_databaseLoaderThread) {
+DebugOnly<PRStatus> status = PR_JoinThread(m_databaseLoaderThread);
+MOZ_ASSERT(status == PR_SUCCESS, "PR_JoinThread failed");
+}
+m_databaseLoaderThread = nullptr;
+}
+PLDHashOperator
+HRTFDatabaseLoader::shutdownEnumFunc(LoaderByRateEntry *entry, void* unused)
+{
+// Ensure the loader thread's reference is removed for leak analysis.
+entry->mLoader->waitForLoaderThreadCompletion();
+return PLDHashOperator::PL_DHASH_NEXT;
+}
+void HRTFDatabaseLoader::shutdown()
+{
+MOZ_ASSERT(NS_IsMainThread());
+if (s_loaderMap) {
+// Set s_loaderMap to nullptr so that the hashtable is not modified on
+// reference release during enumeration.
+nsTHashtable<LoaderByRateEntry>* loaderMap = s_loaderMap;
+s_loaderMap = nullptr;
+loaderMap->EnumerateEntries(shutdownEnumFunc, nullptr);
+delete loaderMap;
+}
+}
+} // namespace WebCore

The Tor Browser / file comparison

comparison: content/media/webaudio/blink/HRTFDatabaseLoader.cpp

content/media/webaudio/blink/HRTFDatabaseLoader.cpp