blob: 4ef37d1d10427be7c92216d33b94477a9c0919b2 [file] [log] [blame]
// 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.
#include <list>
#include "base/basictypes.h"
#include "mojo/public/system/system_export.h"
#include "mojo/system/dispatcher.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 This class implements the standard waiter-signalling
// mechanism in that case.
class MOJO_SYSTEM_EXPORT SimpleDispatcher : public Dispatcher {
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;
// Protected by |lock()|:
WaiterList waiter_list_;
} // namespace system
} // namespace mojo