1 // Copyright 2013 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 MOJO_EDK_SYSTEM_AWAKABLE_LIST_H_ 6 #define MOJO_EDK_SYSTEM_AWAKABLE_LIST_H_ 7 8 #include <stddef.h> 9 #include <stdint.h> 10 11 #include <vector> 12 13 #include "base/macros.h" 14 #include "mojo/edk/system/system_impl_export.h" 15 #include "mojo/edk/system/watcher.h" 16 #include "mojo/edk/system/watcher_set.h" 17 #include "mojo/public/c/system/types.h" 18 19 namespace mojo { 20 namespace edk { 21 22 class Awakable; 23 struct HandleSignalsState; 24 25 // |AwakableList| tracks all the |Waiter|s that are waiting on a given 26 // handle/|Dispatcher|. There should be a |AwakableList| for each handle that 27 // can be waited on (in any way). In the simple case, the |AwakableList| is 28 // owned by the |Dispatcher|, whereas in more complex cases it is owned by the 29 // secondary object (see simple_dispatcher.* and the explanatory comment in 30 // core.cc). This class is thread-unsafe (all concurrent access must be 31 // protected by some lock). 32 class MOJO_SYSTEM_IMPL_EXPORT AwakableList { 33 public: 34 AwakableList(); 35 ~AwakableList(); 36 37 void AwakeForStateChange(const HandleSignalsState& state); 38 void CancelAll(); 39 void Add(Awakable* awakable, MojoHandleSignals signals, uintptr_t context); 40 void Remove(Awakable* awakable); 41 42 // Add and remove Watchers to this AwakableList. 43 MojoResult AddWatcher(MojoHandleSignals signals, 44 const Watcher::WatchCallback& callback, 45 uintptr_t context, 46 const HandleSignalsState& current_state); 47 MojoResult RemoveWatcher(uintptr_t context); 48 49 private: 50 struct AwakeInfo { AwakeInfoAwakeInfo51 AwakeInfo(Awakable* awakable, MojoHandleSignals signals, uintptr_t context) 52 : awakable(awakable), signals(signals), context(context) {} 53 54 Awakable* awakable; 55 MojoHandleSignals signals; 56 uintptr_t context; 57 }; 58 using AwakeInfoList = std::vector<AwakeInfo>; 59 60 AwakeInfoList awakables_; 61 62 // TODO: Remove AwakableList and instead use WatcherSet directly in 63 // dispatchers. 64 WatcherSet watchers_; 65 66 DISALLOW_COPY_AND_ASSIGN(AwakableList); 67 }; 68 69 } // namespace edk 70 } // namespace mojo 71 72 #endif // MOJO_EDK_SYSTEM_AWAKABLE_LIST_H_ 73