зеркало из https://github.com/mozilla/gecko-dev.git
95 строки
2.9 KiB
C++
95 строки
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef AUDIOTHREADREGISTRY_H
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#define AUDIOTHREADREGISTRY_H
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#include <cstdint>
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#include <mozilla/DataMutex.h>
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#include <nsTArray.h>
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#include <thread>
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#include <GeckoProfiler.h>
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namespace mozilla {
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// This class is a singleton that tracks all audio callback threads and makes
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// sure they are registered or unregistered to the profiler safely and
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// consistently.
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//
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// Register and Unregister are fairly expensive and shouldn't be used in a hot
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// path.
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class AudioThreadRegistry final {
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public:
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AudioThreadRegistry() : mThreadIds("AudioThreadId") {}
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~AudioThreadRegistry() {
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// It would be nice to be able to assert that all threads have be
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// unregistered, but we can't: it's legal to suspend an audio stream, so
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// that the callback isn't called, and then immediately destroy it.
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}
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// This is intended to be called when an object starts an audio callback
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// thread.
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void Register(ProfilerThreadId aThreadId) {
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if (!aThreadId.IsSpecified()) {
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// profiler_current_thread_id is unspecified on unsupported platforms.
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return;
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}
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auto threadIds = mThreadIds.Lock();
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for (uint32_t i = 0; i < threadIds->Length(); i++) {
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if ((*threadIds)[i].mId == aThreadId) {
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(*threadIds)[i].mUserCount++;
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return;
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}
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}
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ThreadUserCount tuc;
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tuc.mId = aThreadId;
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tuc.mUserCount = 1;
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threadIds->AppendElement(tuc);
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PROFILER_REGISTER_THREAD("NativeAudioCallback");
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}
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// This is intended to be called when an object stops an audio callback thread
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void Unregister(ProfilerThreadId aThreadId) {
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if (!aThreadId.IsSpecified()) {
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// profiler_current_thread_id is unspedified on unsupported platforms.
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return;
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}
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auto threadIds = mThreadIds.Lock();
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for (uint32_t i = 0; i < threadIds->Length(); i++) {
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if ((*threadIds)[i].mId == aThreadId) {
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MOZ_ASSERT((*threadIds)[i].mUserCount > 0);
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(*threadIds)[i].mUserCount--;
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if ((*threadIds)[i].mUserCount == 0) {
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PROFILER_UNREGISTER_THREAD();
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threadIds->RemoveElementAt(i);
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}
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return;
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}
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}
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MOZ_ASSERT(false);
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}
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private:
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AudioThreadRegistry(const AudioThreadRegistry&) = delete;
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AudioThreadRegistry& operator=(const AudioThreadRegistry&) = delete;
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AudioThreadRegistry(AudioThreadRegistry&&) = delete;
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AudioThreadRegistry& operator=(AudioThreadRegistry&&) = delete;
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struct ThreadUserCount {
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ProfilerThreadId mId; // from profiler_current_thread_id
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int mUserCount;
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};
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DataMutex<nsTArray<ThreadUserCount>> mThreadIds;
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};
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} // namespace mozilla
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#endif // AUDIOTHREADREGISTRY_H
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