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131 lines
4.5 KiB
C++
131 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_EventQueue_h
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#define mozilla_EventQueue_h
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#include "mozilla/Mutex.h"
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#include "mozilla/Queue.h"
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#include "mozilla/TimeStamp.h"
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#include "nsCOMPtr.h"
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class nsIRunnable;
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namespace mozilla {
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enum class EventQueuePriority {
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Idle,
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DeferredTimers,
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InputLow,
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Normal,
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MediumHigh,
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InputHigh,
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Vsync,
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InputHighest,
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Control,
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Count
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};
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class IdlePeriodState;
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namespace detail {
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// EventQueue is our unsynchronized event queue implementation. It is a queue
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// of runnables used for non-main thread, as well as optionally providing
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// forwarding to TaskController.
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//
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// Since EventQueue is unsynchronized, it should be wrapped in an outer
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// SynchronizedEventQueue implementation (like ThreadEventQueue).
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template <size_t ItemsPerPage>
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class EventQueueInternal {
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public:
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explicit EventQueueInternal(bool aForwardToTC) : mForwardToTC(aForwardToTC) {}
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// Add an event to the end of the queue. Implementors are free to use
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// aPriority however they wish. If the runnable supports
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// nsIRunnablePriority and the implementing class supports
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// prioritization, aPriority represents the result of calling
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// nsIRunnablePriority::GetPriority(). *aDelay is time the event has
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// already been delayed (used when moving an event from one queue to
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// another)
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void PutEvent(already_AddRefed<nsIRunnable>&& aEvent,
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EventQueuePriority aPriority, const MutexAutoLock& aProofOfLock,
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mozilla::TimeDuration* aDelay = nullptr);
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// Get an event from the front of the queue. This should return null if the
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// queue is non-empty but the event in front is not ready to run.
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// *aLastEventDelay is the time the event spent in queues before being
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// retrieved.
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already_AddRefed<nsIRunnable> GetEvent(
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const MutexAutoLock& aProofOfLock,
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mozilla::TimeDuration* aLastEventDelay = nullptr);
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// Returns true if the queue is empty. Implies !HasReadyEvent().
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bool IsEmpty(const MutexAutoLock& aProofOfLock);
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// Returns true if the queue is non-empty and if the event in front is ready
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// to run. Implies !IsEmpty(). This should return true iff GetEvent returns a
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// non-null value.
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bool HasReadyEvent(const MutexAutoLock& aProofOfLock);
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// Returns the number of events in the queue.
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size_t Count(const MutexAutoLock& aProofOfLock) const;
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// For some reason, if we put this in the .cpp file the linker can't find it
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already_AddRefed<nsIRunnable> PeekEvent(const MutexAutoLock& aProofOfLock) {
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if (mQueue.IsEmpty()) {
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return nullptr;
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}
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nsCOMPtr<nsIRunnable> result = mQueue.FirstElement();
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return result.forget();
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}
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void EnableInputEventPrioritization(const MutexAutoLock& aProofOfLock) {}
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void FlushInputEventPrioritization(const MutexAutoLock& aProofOfLock) {}
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void SuspendInputEventPrioritization(const MutexAutoLock& aProofOfLock) {}
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void ResumeInputEventPrioritization(const MutexAutoLock& aProofOfLock) {}
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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size_t size = mQueue.ShallowSizeOfExcludingThis(aMallocSizeOf);
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size += mDispatchTimes.ShallowSizeOfExcludingThis(aMallocSizeOf);
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return size;
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}
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private:
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mozilla::Queue<nsCOMPtr<nsIRunnable>, ItemsPerPage> mQueue;
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// This queue is only populated when the profiler is turned on.
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mozilla::Queue<mozilla::TimeStamp, ItemsPerPage> mDispatchTimes;
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TimeDuration mLastEventDelay;
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// This indicates PutEvent forwards runnables to the TaskController. This
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// should be true for the top level event queue on the main thread.
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bool mForwardToTC;
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};
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} // namespace detail
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class EventQueue final : public mozilla::detail::EventQueueInternal<16> {
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public:
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explicit EventQueue(bool aForwardToTC = false)
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: mozilla::detail::EventQueueInternal<16>(aForwardToTC) {}
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};
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template <size_t ItemsPerPage = 16>
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class EventQueueSized final
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: public mozilla::detail::EventQueueInternal<ItemsPerPage> {
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public:
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explicit EventQueueSized(bool aForwardToTC = false)
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: mozilla::detail::EventQueueInternal<ItemsPerPage>(aForwardToTC) {}
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};
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} // namespace mozilla
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#endif // mozilla_EventQueue_h
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