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_WAITER_LIST_H_
6#define MOJO_SYSTEM_WAITER_LIST_H_
7
8#include <stdint.h>
9
10#include <list>
11
12#include "base/macros.h"
13#include "mojo/public/c/system/types.h"
14#include "mojo/system/system_impl_export.h"
15
16namespace mojo {
17namespace system {
18
19class Waiter;
20struct HandleSignalsState;
21
22// |WaiterList| tracks all the |Waiter|s that are waiting on a given
23// handle/|Dispatcher|. There should be a |WaiterList| for each handle that can
24// be waited on (in any way). In the simple case, the |WaiterList| is owned by
25// the |Dispatcher|, whereas in more complex cases it is owned by the secondary
26// object (see simple_dispatcher.* and the explanatory comment in core.cc). This
27// class is thread-unsafe (all concurrent access must be protected by some
28// lock).
29class MOJO_SYSTEM_IMPL_EXPORT WaiterList {
30 public:
31  WaiterList();
32  ~WaiterList();
33
34  void AwakeWaitersForStateChange(const HandleSignalsState& state);
35  void CancelAllWaiters();
36  void AddWaiter(Waiter* waiter, MojoHandleSignals signals, uint32_t context);
37  void RemoveWaiter(Waiter* waiter);
38
39 private:
40  struct WaiterInfo {
41    WaiterInfo(Waiter* waiter, MojoHandleSignals signals, uint32_t context)
42        : waiter(waiter), signals(signals), context(context) {}
43
44    Waiter* waiter;
45    MojoHandleSignals signals;
46    uint32_t context;
47  };
48  typedef std::list<WaiterInfo> WaiterInfoList;
49
50  WaiterInfoList waiters_;
51
52  DISALLOW_COPY_AND_ASSIGN(WaiterList);
53};
54
55}  // namespace system
56}  // namespace mojo
57
58#endif  // MOJO_SYSTEM_WAITER_LIST_H_
59