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/*
* 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;
size_t HRTFDatabaseLoader::sizeOfLoaders(mozilla::MallocSizeOf aMallocSizeOf)
{
return s_loaderMap ? s_loaderMap->SizeOfIncludingThis(aMallocSizeOf) : 0;
}
already_AddRefed<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.forget();
}
loader = new HRTFDatabaseLoader(sampleRate);
entry->mLoader = loader;
loader->loadAsynchronously();
return loader.forget();
}
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 final : public Runnable {
public:
explicit ProxyReleaseEvent(HRTFDatabaseLoader* loader) : mLoader(loader) {}
NS_IMETHOD Run() override
{
mLoader->MainThreadRelease();
return NS_OK;
}
private:
HRTFDatabaseLoader* mLoader;
};
void HRTFDatabaseLoader::ProxyRelease()
{
nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
if (MOZ_LIKELY(mainThread)) {
RefPtr<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;
}
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;
for (auto iter = loaderMap->Iter(); !iter.Done(); iter.Next()) {
iter.Get()->mLoader->waitForLoaderThreadCompletion();
}
delete loaderMap;
}
}
} // namespace WebCore
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