Revert of Straightens outs DEPS in mojo/common

mojo/common/message_pump_mojo.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_COMMON_MESSAGE_PUMP_MOJO_H_
+#define MOJO_COMMON_MESSAGE_PUMP_MOJO_H_
+
+#include <map>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_pump.h"
+#include "base/observer_list.h"
+#include "base/synchronization/lock.h"
+#include "base/time/time.h"
+#include "mojo/common/mojo_common_export.h"
+#include "third_party/mojo/src/mojo/public/cpp/system/core.h"
+
+namespace mojo {
+namespace common {
+
+class MessagePumpMojoHandler;
+
+// Mojo implementation of MessagePump.
+class MOJO_COMMON_EXPORT MessagePumpMojo : public base::MessagePump {
+ public:
+  class Observer {
+   public:
+    Observer() {}
+
+    virtual void WillSignalHandler() = 0;
+    virtual void DidSignalHandler() = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  MessagePumpMojo();
+  ~MessagePumpMojo() override;
+
+  // Static factory function (for using with |base::Thread::Options|, wrapped
+  // using |base::Bind()|).
+  static scoped_ptr<base::MessagePump> Create();
+
+  // Returns the MessagePumpMojo instance of the current thread, if it exists.
+  static MessagePumpMojo* current();
+
+  static bool IsCurrent() { return !!current(); }
+
+  // Registers a MessagePumpMojoHandler for the specified handle. Only one
+  // handler can be registered for a specified handle.
+  // NOTE: a value of 0 for |deadline| indicates an indefinite timeout.
+  void AddHandler(MessagePumpMojoHandler* handler,
+                  const Handle& handle,
+                  MojoHandleSignals wait_signals,
+                  base::TimeTicks deadline);
+
+  void RemoveHandler(const Handle& handle);
+
+  void AddObserver(Observer*);
+  void RemoveObserver(Observer*);
+
+  // MessagePump:
+  void Run(Delegate* delegate) override;
+  void Quit() override;
+  void ScheduleWork() override;
+  void ScheduleDelayedWork(const base::TimeTicks& delayed_work_time) override;
+
+ private:
+  struct RunState;
+  struct WaitState;
+
+  // Contains the data needed to track a request to AddHandler().
+  struct Handler {
+    Handler() : handler(NULL), wait_signals(MOJO_HANDLE_SIGNAL_NONE), id(0) {}
+
+    MessagePumpMojoHandler* handler;
+    MojoHandleSignals wait_signals;
+    base::TimeTicks deadline;
+    // See description of |MessagePumpMojo::next_handler_id_| for details.
+    int id;
+  };
+
+  typedef std::map<Handle, Handler> HandleToHandler;
+
+  // Implementation of Run().
+  void DoRunLoop(RunState* run_state, Delegate* delegate);
+
+  // Services the set of handles ready. If |block| is true this waits for a
+  // handle to become ready, otherwise this does not block. Returns |true| if a
+  // handle has become ready, |false| otherwise.
+  bool DoInternalWork(const RunState& run_state, bool block);
+
+  // Removes the given invalid handle. This is called if MojoWaitMany finds an
+  // invalid handle.
+  void RemoveInvalidHandle(const WaitState& wait_state,
+                           MojoResult result,
+                           uint32_t result_index);
+
+  void SignalControlPipe(const RunState& run_state);
+
+  WaitState GetWaitState(const RunState& run_state) const;
+
+  // Returns the deadline for the call to MojoWaitMany().
+  MojoDeadline GetDeadlineForWait(const RunState& run_state) const;
+
+  void WillSignalHandler();
+  void DidSignalHandler();
+
+  // If non-NULL we're running (inside Run()). Member is reference to value on
+  // stack.
+  RunState* run_state_;
+
+  // Lock for accessing |run_state_|. In general the only method that we have to
+  // worry about is ScheduleWork(). All other methods are invoked on the same
+  // thread.
+  base::Lock run_state_lock_;
+
+  HandleToHandler handlers_;
+
+  // An ever increasing value assigned to each Handler::id. Used to detect
+  // uniqueness while notifying. That is, while notifying expired timers we copy
+  // |handlers_| and only notify handlers whose id match. If the id does not
+  // match it means the handler was removed then added so that we shouldn't
+  // notify it.
+  int next_handler_id_;
+
+  base::ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(MessagePumpMojo);
+};
+
+}  // namespace common
+}  // namespace mojo
+
+#endif  // MOJO_COMMON_MESSAGE_PUMP_MOJO_H_