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_SYSTEM_WAITER_LIST_H_ 6 #define MOJO_SYSTEM_WAITER_LIST_H_ 7 8 #include <stdint.h> 9 10 #include <list> 11 12 #include "base/macros.h" 13 #include "mojo/public/c/system/types.h" 14 #include "mojo/system/system_impl_export.h" 15 16 namespace mojo { 17 namespace system { 18 19 class Waiter; 20 struct HandleSignalsState; 21 22 // |WaiterList| tracks all the |Waiter|s that are waiting on a given 23 // handle/|Dispatcher|. There should be a |WaiterList| for each handle that can 24 // be waited on (in any way). In the simple case, the |WaiterList| is owned by 25 // the |Dispatcher|, whereas in more complex cases it is owned by the secondary 26 // object (see simple_dispatcher.* and the explanatory comment in core.cc). This 27 // class is thread-unsafe (all concurrent access must be protected by some 28 // lock). 29 class MOJO_SYSTEM_IMPL_EXPORT WaiterList { 30 public: 31 WaiterList(); 32 ~WaiterList(); 33 34 void AwakeWaitersForStateChange(const HandleSignalsState& state); 35 void CancelAllWaiters(); 36 void AddWaiter(Waiter* waiter, MojoHandleSignals signals, uint32_t context); 37 void RemoveWaiter(Waiter* waiter); 38 39 private: 40 struct WaiterInfo { 41 WaiterInfo(Waiter* waiter, MojoHandleSignals signals, uint32_t context) 42 : waiter(waiter), signals(signals), context(context) {} 43 44 Waiter* waiter; 45 MojoHandleSignals signals; 46 uint32_t context; 47 }; 48 typedef std::list<WaiterInfo> WaiterInfoList; 49 50 WaiterInfoList waiters_; 51 52 DISALLOW_COPY_AND_ASSIGN(WaiterList); 53 }; 54 55 } // namespace system 56 } // namespace mojo 57 58 #endif // MOJO_SYSTEM_WAITER_LIST_H_ 59
