IPDLActor.h (1493B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef MOZILLA_LAYERS_IPDLACTOR_H 8 #define MOZILLA_LAYERS_IPDLACTOR_H 9 10 #include "mozilla/ipc/ProtocolUtils.h" 11 #include "mozilla/layers/CompositableForwarder.h" 12 #include "gfxPlatform.h" 13 14 namespace mozilla { 15 namespace layers { 16 17 /// A base class to facilitate the deallocation of IPDL actors. 18 /// 19 /// Implements the parent side of the simple deallocation handshake. 20 /// Override the Destroy method rather than the ActorDestroy method. 21 template <typename Protocol> 22 class ParentActor : public Protocol { 23 public: 24 ParentActor() : mDestroyed(false) {} 25 26 ~ParentActor() { MOZ_ASSERT(mDestroyed); } 27 28 bool CanSend() const { return !mDestroyed; } 29 30 // Override this rather than ActorDestroy 31 virtual void Destroy() {} 32 33 mozilla::ipc::IPCResult RecvDestroy() final { 34 DestroyIfNeeded(); 35 (void)Protocol::Send__delete__(this); 36 return IPC_OK(); 37 } 38 39 typedef ipc::IProtocol::ActorDestroyReason Why; 40 41 void ActorDestroy(Why) override { DestroyIfNeeded(); } 42 43 protected: 44 void DestroyIfNeeded() { 45 if (!mDestroyed) { 46 Destroy(); 47 mDestroyed = true; 48 } 49 } 50 51 private: 52 bool mDestroyed; 53 }; 54 55 } // namespace layers 56 } // namespace mozilla 57 58 #endif