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+/* -*- Mode: C++; tab-width: 8; 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 mozilla_ipc_IdleSchedulerChild_h__
+#define mozilla_ipc_IdleSchedulerChild_h__
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ipc/PIdleSchedulerChild.h"
+
+class nsIIdlePeriod;
+
+namespace mozilla {
+class IdlePeriodState;
+
+namespace ipc {
+
+class BackgroundChildImpl;
+
+class IdleSchedulerChild final : public PIdleSchedulerChild {
+ public:
+ IdleSchedulerChild() = default;
+
+ NS_INLINE_DECL_REFCOUNTING(IdleSchedulerChild)
+
+ IPCResult RecvIdleTime(uint64_t aId, TimeDuration aBudget);
+
+ void Init(IdlePeriodState* aIdlePeriodState);
+
+ void Disconnect() { mIdlePeriodState = nullptr; }
+
+ // See similar methods on PrioritizedEventQueue.
+ void SetActive();
+ // Returns true if activity state dropped below cpu count.
+ bool SetPaused();
+
+ typedef MozPromise<bool, ResponseRejectReason, true> MayGCPromise;
+
+ // Returns null if a GC or GC request is already in progress.
+ RefPtr<MayGCPromise> MayGCNow();
+
+ // Regardless of how a GC is started we get informed via these.
+ void StartedGC();
+ void DoneGC();
+
+ // Returns nullptr if this is the parent process or the IdleSchedulerChild has
+ // already been destroyed, eg if IPC is shutting down.
+ static IdleSchedulerChild* GetMainThreadIdleScheduler();
+
+ private:
+ ~IdleSchedulerChild();
+
+ friend class BackgroundChildImpl;
+
+ // See IdleScheduleParent::sActiveChildCounter
+ base::SharedMemory mActiveCounter;
+
+ IdlePeriodState* mIdlePeriodState = nullptr;
+
+ uint32_t mChildId = 0;
+
+ // These fields replicate those in IdleSchedulerParent. Tracking them here
+ // ensures we don't send confusing information to the parent, while
+ // nsJSEnvironment is free to tell us about any GCs.
+ bool mIsRequestingGC = false;
+ bool mIsDoingGC = false;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif // mozilla_ipc_IdleSchedulerChild_h__