ProcInfoParent.h - mozsearch

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/* 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_ProcInfoParent_h

#define mozilla_ProcInfoParent_h

#include "mozilla/PProcInfoParent.h"

#include "mozilla/ProcInfo.h"

#include "nsITimer.h"

#include "nsTArray.h"

namespace mozilla {

// Parent process side of PProcInfo. Lives on the main thread.

class ProcInfoParent final : public PProcInfoParent {

 public:

  NS_INLINE_DECL_REFCOUNTING(ProcInfoParent, override)

  using RemoteProcInfoPromise = MozPromise<RemoteProcInfo, nsresult, true>;

  // Binds a new actor to aEndpoint. The actor is kept alive until the channel

  // is closed.

  static already_AddRefed<ProcInfoParent> Create(

      ipc::Endpoint<PProcInfoParent>&& aEndpoint);

  // Returns the actor connected to the process with the given GeckoChildID, if

  // any.

  static ProcInfoParent* Get(GeckoChildID aChildID);

  void Shutdown();

  // Requests the child's system info (memory, CPU time and threads). Note that

  // as this information is self-reported from the child process it cannot be

  // trusted, and must be used accordingly.

  RefPtr<RemoteProcInfoPromise> GetProcInfo();

 private:

  explicit ProcInfoParent(GeckoChildID aChildID) : mChildID(aChildID) {}

  ~ProcInfoParent() = default;

  void ActorDestroy(ActorDestroyReason aWhy) override;

  const GeckoChildID mChildID;

  struct PendingRequest {

    RefPtr<RemoteProcInfoPromise::Private> mPromise;

    nsCOMPtr<nsITimer> mTimer;

};

  // Pending calls to GetProcInfo() awaiting a response. When the child next

  // replies these will all be resolved with the result, if they have not yet

  // timed out.

  nsTArray<PendingRequest> mPendingRequests;

  // Whether we are awaiting a reply from the child. Used to avoid repeatedly

  // sending messages to a non-responsive child.

  bool mAwaitingReply = false;

};

}  // namespace mozilla

#endif