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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_WAIT_SET_DISPATCHER_H_ | |
6 #define THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_WAIT_SET_DISPATCHER_H_ | |
7 | |
8 #include <deque> | |
9 #include <map> | |
10 #include <utility> | |
11 | |
12 #include "base/memory/scoped_ptr.h" | |
13 #include "mojo/public/cpp/system/macros.h" | |
14 #include "third_party/mojo/src/mojo/edk/system/awakable_list.h" | |
15 #include "third_party/mojo/src/mojo/edk/system/dispatcher.h" | |
16 #include "third_party/mojo/src/mojo/edk/system/mutex.h" | |
17 #include "third_party/mojo/src/mojo/edk/system/system_impl_export.h" | |
18 | |
19 namespace mojo { | |
20 namespace system { | |
21 | |
22 class MOJO_SYSTEM_IMPL_EXPORT WaitSetDispatcher : public Dispatcher { | |
23 public: | |
24 WaitSetDispatcher(); | |
25 ~WaitSetDispatcher() override; | |
26 | |
27 // |Dispatcher| public methods: | |
28 Type GetType() const override; | |
29 | |
30 private: | |
31 // Internal implementation of Awakable. | |
32 class Waiter; | |
33 | |
34 struct WaitState { | |
35 scoped_refptr<Dispatcher> dispatcher; | |
36 MojoHandleSignals signals; | |
37 uintptr_t context; | |
38 }; | |
39 | |
40 // |Dispatcher| protected methods: | |
41 void CloseImplNoLock() override; | |
42 void CancelAllAwakablesNoLock() override; | |
43 MojoResult AddAwakableImplNoLock(Awakable* awakable, | |
44 MojoHandleSignals signals, | |
45 uintptr_t context, | |
46 HandleSignalsState* signals_state) override; | |
47 void RemoveAwakableImplNoLock(Awakable* awakable, | |
48 HandleSignalsState* signals_state) override; | |
49 MojoResult AddWaitingDispatcherImplNoLock( | |
50 const scoped_refptr<Dispatcher>& dispatcher, | |
51 MojoHandleSignals signals, | |
52 uintptr_t context) override; | |
53 MojoResult RemoveWaitingDispatcherImplNoLock( | |
54 const scoped_refptr<Dispatcher>& dispatcher) override; | |
55 MojoResult GetReadyDispatchersImplNoLock( | |
56 UserPointer<uint32_t> count, | |
57 DispatcherVector* dispatchers, | |
58 UserPointer<MojoResult> results, | |
59 UserPointer<uintptr_t> contexts) override; | |
60 HandleSignalsState GetHandleSignalsStateImplNoLock() const override; | |
61 scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock() | |
62 override; | |
63 | |
64 // Signal that the dispatcher indexed by |context| has been woken up with | |
65 // |result| and is now ready. | |
66 void WakeDispatcher(MojoResult result, uintptr_t context); | |
67 | |
68 // Map of dispatchers being waited on. Key is a Dispatcher* casted to a | |
69 // uintptr_t, and should be treated as an opaque value and not casted back. | |
70 std::map<uintptr_t, WaitState> waiting_dispatchers_ MOJO_GUARDED_BY(mutex()); | |
71 | |
72 // Separate mutex that can be locked without locking |mutex()|. | |
73 mutable Mutex awoken_mutex_ MOJO_ACQUIRED_AFTER(mutex()); | |
74 // List of dispatchers that have been woken up. Any dispatcher in this queue | |
75 // will NOT currently be waited on. | |
76 std::deque<std::pair<uintptr_t, MojoResult>> awoken_queue_ | |
77 MOJO_GUARDED_BY(awoken_mutex_); | |
78 // List of dispatchers that have been woken up and retrieved on the last call | |
79 // to |GetReadyDispatchers()|. | |
80 std::deque<uintptr_t> processed_dispatchers_ MOJO_GUARDED_BY(awoken_mutex_); | |
81 | |
82 // Separate mutex that can be locked without locking |mutex()|. | |
83 Mutex awakable_mutex_ MOJO_ACQUIRED_AFTER(mutex()); | |
84 // List of dispatchers being waited on. | |
85 AwakableList awakable_list_ MOJO_GUARDED_BY(awakable_mutex_); | |
86 | |
87 // Waiter used to wait on dispatchers. | |
88 scoped_ptr<Waiter> waiter_; | |
89 }; | |
90 | |
91 } // namespace system | |
92 } // namespace mojo | |
93 | |
94 #endif // THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_WAIT_SET_DISPATCHER_H_ | |
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