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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef CALLBACKTHREADREGISTRY_H
#define CALLBACKTHREADREGISTRY_H
#include <cstdint>
#include <mozilla/DataMutex.h>
#include <nsTArray.h>
#include <thread>
#include <GeckoProfiler.h>
namespace mozilla {
// This class is a singleton that tracks various callback threads and makes
// sure they are registered or unregistered to the profiler safely and
// consistently.
//
// Register and Unregister are fairly expensive and shouldn't be used in a hot
// path.
class CallbackThreadRegistry final {
public:
CallbackThreadRegistry();
~CallbackThreadRegistry() {
// It would be nice to be able to assert that all threads have been
// unregistered, but we can't: it's legal to suspend an audio stream, so
// that the callback isn't called, and then immediately destroy it.
}
CallbackThreadRegistry(const CallbackThreadRegistry&) = delete;
CallbackThreadRegistry& operator=(const CallbackThreadRegistry&) = delete;
CallbackThreadRegistry(CallbackThreadRegistry&&) = delete;
CallbackThreadRegistry& operator=(CallbackThreadRegistry&&) = delete;
// Returns the global instance of CallbackThreadRegistry. Safe from all
// threads.
static CallbackThreadRegistry* Get();
// This is intended to be called in the first callback of a callback
// thread.
void Register(ProfilerThreadId aThreadId, const char* aName);
// This is intended to be called when an object stops an audio callback thread
void Unregister(ProfilerThreadId aThreadId);
private:
struct ThreadUserCount {
ProfilerThreadId mId; // from profiler_current_thread_id
int mUserCount = 0;
};
DataMutex<nsTArray<ThreadUserCount>> mThreadIds;
};
} // namespace mozilla
#endif // CALLBACKTHREADREGISTRY_H
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