1 files changed, 75 insertions, 0 deletions
diff --git a/ipc/glue/IdleSchedulerChild.h b/ipc/glue/IdleSchedulerChild.h
new file mode 100644
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+++ b/ipc/glue/IdleSchedulerChild.h
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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__