realtime_audio_worklet_thread.cc | Explore in Territory

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/webaudio/realtime_audio_worklet_thread.h"

#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/renderer/core/workers/global_scope_creation_params.h"
#include "third_party/blink/renderer/modules/webaudio/audio_worklet_global_scope.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"

namespace blink {

namespace {

// The realtime AudioWorklet thread is managed by a pool system. The system
// can contain up to 4 concurrent real-time threads and it is based on “first
// come first served” policy.
// - The 1st ~ 3rd threads are a “dedicated” thread. The first 3 AudioWorklets
//   will have their own dedicated backing thread.
// - The 4th thread is a “shared” thread: Starting from the 4th AudioWorklet,
//   all subsequent contexts will share the same thread for the AudioWorklet
//   operation.
static constexpr int kMaxDedicatedBackingThreadCount = …;

// Used for counting dedicated backing threads. Incremented by the constructor
// and decremented by destructor.
int dedicated_backing_thread_count = …;

// Used for ref-counting of all backing thread in the current renderer process.
// Incremented by the constructor and decremented by destructor.
int shared_backing_thread_ref_count = …;

// For UMA logging: Represents the maximum number of dedicated backing worklet
// threads throughout the lifetime of the document/frame. Can't exceed
// `kMaxDedicatedBackingThreadCount`.
int peak_dedicated_backing_thread_count = …;

// For UMA logging: Represents the maximum number of ref counts using the
// shared backing thread throughout the lifetime of the document/frame.
int peak_shared_backing_thread_ref_count = …;

}  // namespace

template class WorkletThreadHolder<RealtimeAudioWorkletThread>;

RealtimeAudioWorkletThread::RealtimeAudioWorkletThread(
    WorkerReportingProxy& worker_reporting_proxy,
    base::TimeDelta realtime_buffer_duration)
    : … { … }

RealtimeAudioWorkletThread::~RealtimeAudioWorkletThread() { … }

WorkerBackingThread& RealtimeAudioWorkletThread::GetWorkerBackingThread() { … }

WorkerOrWorkletGlobalScope* RealtimeAudioWorkletThread::CreateWorkerGlobalScope(
    std::unique_ptr<GlobalScopeCreationParams> creation_params) { … }

}  // namespace blink
chromium/third_party/blink/renderer/modules/webaudio/realtime_audio_worklet_thread.cc
