Index: components/timers/rtc_alarm.h |
diff --git a/components/timers/rtc_alarm.h b/components/timers/rtc_alarm.h |
deleted file mode 100644 |
index 8cc06bd49a570b612a6dc5b6de6527b409e3c4f3..0000000000000000000000000000000000000000 |
--- a/components/timers/rtc_alarm.h |
+++ /dev/null |
@@ -1,95 +0,0 @@ |
-// Copyright 2014 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 COMPONENTS_TIMER_RTC_ALARM_H_ |
-#define COMPONENTS_TIMER_RTC_ALARM_H_ |
- |
-#include "base/macros.h" |
-#include "base/memory/ref_counted.h" |
-#include "base/memory/scoped_ptr.h" |
-#include "base/memory/weak_ptr.h" |
-#include "base/message_loop/message_loop.h" |
-#include "base/time/time.h" |
-#include "components/timers/alarm_timer.h" |
- |
-namespace base { |
-class MessageLoopProxy; |
-} |
- |
-namespace timers { |
-// This class manages a Real Time Clock (RTC) alarm, a feature that is available |
-// from linux version 3.11 onwards. It creates a file descriptor for the RTC |
-// alarm timer and then watches that file descriptor to see when it can be read |
-// without blocking, indicating that the timer has fired. |
-// |
-// A major problem for this class is that watching file descriptors is only |
-// available on a MessageLoopForIO but there is no guarantee the timer is going |
-// to be created on one. To get around this, the timer has a dedicated thread |
-// with a MessageLoopForIO that posts tasks back to the thread that started the |
-// timer. |
-// |
-// This class is designed to work together with the AlarmTimer class and is |
-// tested through the AlarmTimer unit tests. DO NOT TRY TO USE THIS CLASS |
-// DIRECTLY. Or use it anyway, I'm a comment not a cop. |
-class RtcAlarm : public AlarmTimer::Delegate, |
- public base::MessageLoopForIO::Watcher { |
- public: |
- RtcAlarm(); |
- |
- // AlarmTimer::Delegate overrides. |
- bool Init(base::WeakPtr<AlarmTimer> timer) override; |
- void Stop() override; |
- void Reset(base::TimeDelta delay) override; |
- |
- // base::MessageLoopForIO::Watcher overrides. |
- void OnFileCanReadWithoutBlocking(int fd) override; |
- void OnFileCanWriteWithoutBlocking(int fd) override; |
- |
- protected: |
- // Needs to be protected because AlarmTimer::Delegate is a refcounted class. |
- ~RtcAlarm() override; |
- |
- private: |
- // Actually performs the system calls to set up the timer. This must be |
- // called on a MessageLoopForIO. |
- void ResetImpl(base::TimeDelta delay, int event_id); |
- |
- // Callback that is run when the timer fires. Must be run on |
- // |origin_message_loop_|. |
- void OnTimerFired(int event_id); |
- |
- // File descriptor associated with the alarm timer. |
- int alarm_fd_; |
- |
- // Message loop which initially started the timer. |
- scoped_refptr<base::MessageLoopProxy> origin_message_loop_; |
- |
- // The parent timer that should be informed when the timer fires. We may end |
- // up outliving the parent so we need to ensure the reference is valid before |
- // we try to call it. |
- base::WeakPtr<AlarmTimer> parent_; |
- |
- // Manages watching file descriptors. |
- scoped_ptr<base::MessageLoopForIO::FileDescriptorWatcher> fd_watcher_; |
- |
- // These two variables are used for coordinating between the thread that |
- // started the timer and the IO thread being used to watch the timer file |
- // descriptor. When Reset() is called, the original thread increments |
- // |origin_event_id_| and binds its value to ResetImpl(), which gets posted to |
- // the IO thread. When the IO thread runs, it saves this value in |
- // |io_event_id_|. Later, when the timer fires, the IO thread binds the value |
- // of |io_event_id_| to OnTimerFired() and posts it to the original thread. |
- // When the original thread runs OnTimerFired(), it calls |
- // parent_->OnTimerFired() only if |origin_event_id_| matches the event id |
- // that was passed in to it. This is used to get around a race condition |
- // where the user resets the timer on the original thread, while the event is |
- // being fired on the IO thread at the same time. |
- int origin_event_id_; |
- int io_event_id_; |
- |
- DISALLOW_COPY_AND_ASSIGN(RtcAlarm); |
-}; |
- |
-} // namespace timers |
-#endif // COMPONENTS_TIMER_RTC_ALARM_H_ |