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comparison: ipc/glue/BackgroundParent.h
ipc/glue/BackgroundParent.h
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #ifndef mozilla_ipc_backgroundparent_h__ | |
| 6 #define mozilla_ipc_backgroundparent_h__ | |
| 7 | |
| 8 #include "base/process.h" | |
| 9 #include "mozilla/Attributes.h" | |
| 10 #include "mozilla/ipc/Transport.h" | |
| 11 | |
| 12 template <class> class already_AddRefed; | |
| 13 | |
| 14 namespace mozilla { | |
| 15 namespace dom { | |
| 16 | |
| 17 class ContentParent; | |
| 18 | |
| 19 } // namespace dom | |
| 20 | |
| 21 namespace ipc { | |
| 22 | |
| 23 class PBackgroundParent; | |
| 24 | |
| 25 // This class is not designed for public consumption beyond the few static | |
| 26 // member functions. | |
| 27 class BackgroundParent MOZ_FINAL | |
| 28 { | |
| 29 friend class mozilla::dom::ContentParent; | |
| 30 | |
| 31 typedef base::ProcessId ProcessId; | |
| 32 typedef mozilla::dom::ContentParent ContentParent; | |
| 33 typedef mozilla::ipc::Transport Transport; | |
| 34 | |
| 35 public: | |
| 36 // This function allows the caller to determine if the given parent actor | |
| 37 // corresponds to a child actor from another process or a child actor from a | |
| 38 // different thread in the same process. | |
| 39 // This function may only be called on the background thread. | |
| 40 static bool | |
| 41 IsOtherProcessActor(PBackgroundParent* aBackgroundActor); | |
| 42 | |
| 43 // This function returns the ContentParent associated with the parent actor if | |
| 44 // the parent actor corresponds to a child actor from another process. If the | |
| 45 // parent actor corresponds to a child actor from a different thread in the | |
| 46 // same process then this function returns null. | |
| 47 // This function may only be called on the background thread. However, | |
| 48 // ContentParent is not threadsafe and the returned pointer may not be used on | |
| 49 // any thread other than the main thread. Callers must take care to use (and | |
| 50 // release) the returned pointer appropriately. | |
| 51 static already_AddRefed<ContentParent> | |
| 52 GetContentParent(PBackgroundParent* aBackgroundActor); | |
| 53 | |
| 54 private: | |
| 55 // Only called by ContentParent for cross-process actors. | |
| 56 static PBackgroundParent* | |
| 57 Alloc(ContentParent* aContent, | |
| 58 Transport* aTransport, | |
| 59 ProcessId aOtherProcess); | |
| 60 }; | |
| 61 | |
| 62 // Implemented in BackgroundImpl.cpp. | |
| 63 bool | |
| 64 IsOnBackgroundThread(); | |
| 65 | |
| 66 #ifdef DEBUG | |
| 67 | |
| 68 // Implemented in BackgroundImpl.cpp. | |
| 69 void | |
| 70 AssertIsOnBackgroundThread(); | |
| 71 | |
| 72 #else | |
| 73 | |
| 74 inline void | |
| 75 AssertIsOnBackgroundThread() | |
| 76 { } | |
| 77 | |
| 78 #endif // DEBUG | |
| 79 | |
| 80 } // namespace ipc | |
| 81 } // namespace mozilla | |
| 82 | |
| 83 #endif // mozilla_ipc_backgroundparent_h__ |
