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/system_impl_export.h" 13 #include "mojo/system/waiter_list.h" 14 15 namespace mojo { 16 namespace system { 17 18 // A base class for simple dispatchers. "Simple" means that there's a one-to-one 19 // correspondence between handles and dispatchers (see the explanatory comment 20 // in core_impl.cc). This class implements the standard waiter-signalling 21 // mechanism in that case. 22 class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher { 23 protected: 24 SimpleDispatcher(); 25 26 friend class base::RefCountedThreadSafe<SimpleDispatcher>; 27 virtual ~SimpleDispatcher(); 28 29 // To be called by subclasses when the state changes (so 30 // |SatisfiedFlagsNoLock()| and |SatisfiableFlagsNoLock()| should be checked 31 // again). Must be called under lock. 32 void StateChangedNoLock(); 33 34 // These should return the wait flags that are satisfied by the object's 35 // current state and those that may eventually be satisfied by this object's 36 // state, respectively. They should be overridden by subclasses to reflect 37 // their notion of state. They are never called after the dispatcher has been 38 // closed. They are called under |lock_|. 39 virtual MojoWaitFlags SatisfiedFlagsNoLock() const = 0; 40 virtual MojoWaitFlags SatisfiableFlagsNoLock() const = 0; 41 42 // |Dispatcher| implementation/overrides: 43 virtual void CancelAllWaitersNoLock() OVERRIDE; 44 virtual MojoResult AddWaiterImplNoLock(Waiter* waiter, 45 MojoWaitFlags flags, 46 MojoResult wake_result) OVERRIDE; 47 virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE; 48 49 private: 50 // Protected by |lock()|: 51 WaiterList waiter_list_; 52 53 DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher); 54 }; 55 56 } // namespace system 57 } // namespace mojo 58 59 #endif // MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ 60