blob: 39ac7b0010063da32b1d9975a6d16235f81da4f7 [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.
#ifndef MOJO_SYSTEM_WAITER_LIST_H_
#define MOJO_SYSTEM_WAITER_LIST_H_
#include <stdint.h>
#include <list>
#include "base/macros.h"
#include "mojo/public/c/system/types.h"
#include "mojo/system/system_impl_export.h"
namespace mojo {
namespace system {
class Waiter;
struct HandleSignalsState;
// |WaiterList| tracks all the |Waiter|s that are waiting on a given
// handle/|Dispatcher|. There should be a |WaiterList| for each handle that can
// be waited on (in any way). In the simple case, the |WaiterList| is owned by
// the |Dispatcher|, whereas in more complex cases it is owned by the secondary
// object (see simple_dispatcher.* and the explanatory comment in core.cc). This
// class is thread-unsafe (all concurrent access must be protected by some
// lock).
class MOJO_SYSTEM_IMPL_EXPORT WaiterList {
public:
WaiterList();
~WaiterList();
void AwakeWaitersForStateChange(const HandleSignalsState& state);
void CancelAllWaiters();
void AddWaiter(Waiter* waiter, MojoHandleSignals signals, uint32_t context);
void RemoveWaiter(Waiter* waiter);
private:
struct WaiterInfo {
WaiterInfo(Waiter* waiter, MojoHandleSignals signals, uint32_t context)
: waiter(waiter), signals(signals), context(context) {}
Waiter* waiter;
MojoHandleSignals signals;
uint32_t context;
};
typedef std::list<WaiterInfo> WaiterInfoList;
WaiterInfoList waiters_;
DISALLOW_COPY_AND_ASSIGN(WaiterList);
};
} // namespace system
} // namespace mojo
#endif // MOJO_SYSTEM_WAITER_LIST_H_