Initial in-process implementation of some Mojo primitives.

mojo/system/waiter_list.h

+// 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 <list>
+
+#include "base/basictypes.h"
+#include "mojo/public/system/core.h"
+
+namespace mojo {
+namespace system {
+
+class Waiter;
+
+// |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_impl.cc).
+// This class is thread-unsafe (all concurrent access must be protected by some
+// lock).
+class WaiterList {
+ public:
+  WaiterList();
+  ~WaiterList();
+
+  void AwakeWaitersForStateChange(MojoWaitFlags satisfied_flags,
+                                  MojoWaitFlags satisfiable_flags);
+  void CancelAllWaiters();
+  void AddWaiter(Waiter* waiter, MojoWaitFlags flags, MojoResult wake_result);
+  void RemoveWaiter(Waiter* waiter);
+
+ private:
+  struct WaiterInfo {
+    WaiterInfo(Waiter* waiter, MojoWaitFlags flags, MojoResult wake_result)
+        : waiter(waiter), flags(flags), wake_result(wake_result) {}
+
+    Waiter* waiter;
+    MojoWaitFlags flags;
+    MojoResult wake_result;
+  };
+  typedef std::list<WaiterInfo> WaiterInfoList;
+
+  WaiterInfoList waiters_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaiterList);
+};
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_WAITER_LIST_H_