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61 lines
2.0 KiB
C++
61 lines
2.0 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 CALLBACKTHREADREGISTRY_H
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#define CALLBACKTHREADREGISTRY_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 various 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 CallbackThreadRegistry final {
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public:
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CallbackThreadRegistry();
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~CallbackThreadRegistry() {
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// It would be nice to be able to assert that all threads have been
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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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CallbackThreadRegistry(const CallbackThreadRegistry&) = delete;
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CallbackThreadRegistry& operator=(const CallbackThreadRegistry&) = delete;
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CallbackThreadRegistry(CallbackThreadRegistry&&) = delete;
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CallbackThreadRegistry& operator=(CallbackThreadRegistry&&) = delete;
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// Returns the global instance of CallbackThreadRegistry. Safe from all
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// threads.
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static CallbackThreadRegistry* Get();
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// This is intended to be called in the first callback of a callback
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// thread.
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void Register(ProfilerThreadId aThreadId, const char* aName);
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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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private:
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struct ThreadUserCount {
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ProfilerThreadId mId; // from profiler_current_thread_id
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int mUserCount = 0;
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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 // CALLBACKTHREADREGISTRY_H
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