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_SIMPLE_DISPATCHER_H_ 6 #define MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ 7 8 #include <list> 9 10 #include "base/basictypes.h" 11 #include "mojo/system/dispatcher.h" 12 #include "mojo/system/handle_signals_state.h" 13 #include "mojo/system/system_impl_export.h" 14 #include "mojo/system/waiter_list.h" 15 16 namespace mojo { 17 namespace system { 18 19 // A base class for simple dispatchers. "Simple" means that there's a one-to-one 20 // correspondence between handles and dispatchers (see the explanatory comment 21 // in core.cc). This class implements the standard waiter-signalling mechanism 22 // in that case. 23 class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher { 24 protected: 25 SimpleDispatcher(); 26 virtual ~SimpleDispatcher(); 27 28 // To be called by subclasses when the state changes (so 29 // |GetHandleSignalsStateNoLock()| should be checked again). Must be called 30 // under lock. 31 void HandleSignalsStateChangedNoLock(); 32 33 // Never called after the dispatcher has been closed; called under |lock_|. 34 virtual HandleSignalsState GetHandleSignalsStateNoLock() const = 0; 35 36 // |Dispatcher| protected methods: 37 virtual void CancelAllWaitersNoLock() OVERRIDE; 38 virtual MojoResult AddWaiterImplNoLock(Waiter* waiter, 39 MojoHandleSignals signals, 40 uint32_t context) OVERRIDE; 41 virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE; 42 43 private: 44 // Protected by |lock()|: 45 WaiterList waiter_list_; 46 47 DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher); 48 }; 49 50 } // namespace system 51 } // namespace mojo 52 53 #endif // MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ 54