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 16namespace mojo { 17namespace system { 18 19class Waiter; 20struct 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). 29class 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