| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ |
| #define MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ |
| |
| #include <list> |
| |
| #include "base/basictypes.h" |
| #include "mojo/system/dispatcher.h" |
| #include "mojo/system/system_impl_export.h" |
| #include "mojo/system/waiter_list.h" |
| |
| namespace mojo { |
| namespace system { |
| |
| // A base class for simple dispatchers. "Simple" means that there's a one-to-one |
| // correspondence between handles and dispatchers (see the explanatory comment |
| // in core_impl.cc). This class implements the standard waiter-signalling |
| // mechanism in that case. |
| class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher { |
| protected: |
| SimpleDispatcher(); |
| |
| friend class base::RefCountedThreadSafe<SimpleDispatcher>; |
| virtual ~SimpleDispatcher(); |
| |
| // To be called by subclasses when the state changes (so |
| // |SatisfiedFlagsNoLock()| and |SatisfiableFlagsNoLock()| should be checked |
| // again). Must be called under lock. |
| void StateChangedNoLock(); |
| |
| // These should return the wait flags that are satisfied by the object's |
| // current state and those that may eventually be satisfied by this object's |
| // state, respectively. They should be overridden by subclasses to reflect |
| // their notion of state. They are never called after the dispatcher has been |
| // closed. They are called under |lock_|. |
| virtual MojoWaitFlags SatisfiedFlagsNoLock() const = 0; |
| virtual MojoWaitFlags SatisfiableFlagsNoLock() const = 0; |
| |
| // |Dispatcher| implementation/overrides: |
| virtual void CancelAllWaitersNoLock() OVERRIDE; |
| virtual MojoResult AddWaiterImplNoLock(Waiter* waiter, |
| MojoWaitFlags flags, |
| MojoResult wake_result) OVERRIDE; |
| virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE; |
| |
| private: |
| // Protected by |lock()|: |
| WaiterList waiter_list_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher); |
| }; |
| |
| } // namespace system |
| } // namespace mojo |
| |
| #endif // MOJO_SYSTEM_SIMPLE_DISPATCHER_H_ |