1    :  // Copyright 2014 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #ifndef SYZYGY_KASKO_WAITABLE_TIMER_IMPL_H_
  16    :  #define SYZYGY_KASKO_WAITABLE_TIMER_IMPL_H_
  17    :  
  18    :  #include <windows.h>
  19    :  
  20    :  #include <memory>
  21    :  
  22    :  #include "base/macros.h"
  23    :  #include "base/win/scoped_handle.h"
  24    :  #include "syzygy/kasko/waitable_timer.h"
  25    :  
  26  m :  namespace base {
  27  m :  class TimeDelta;
  28  m :  }  // namespace base
  29    :  
  30  m :  namespace kasko {
  31    :  
  32    :  // Implements WaitableTimer using a fixed timer interval.
  33  m :  class WaitableTimerImpl : public WaitableTimer {
  34  m :   public:
  35    :    // Creates an instance with a fixed timer interval. Each time the timer is
  36    :    // started, it will become signaled after the given interval elapses.
  37    :    // @param interval The fixed timer interval.
  38    :    // @returns a WaitableTimer instance, or NULL in case of an error.
  39  m :    static std::unique_ptr<WaitableTimer> Create(const base::TimeDelta& interval);
  40    :  
  41  m :    ~WaitableTimerImpl() override;
  42    :  
  43    :    // WaitableTimer implementation.
  44  m :    void Start() override;
  45  m :    HANDLE GetHANDLE() override;
  46    :  
  47  m :   private:
  48    :    // Instantiates an instance using the pre-created waitable timer handle and a
  49    :    // fixed interval.
  50    :    // @param handle A waitable timer HANDLE.
  51    :    // @param interval The fixed timer interval.
  52  m :    explicit WaitableTimerImpl(base::win::ScopedHandle handle,
  53  m :                               const base::TimeDelta& interval);
  54    :  
  55    :    // A waitable timer HANDLE.
  56  m :    base::win::ScopedHandle handle_;
  57    :    // The fixed timer interval, in a format suitable for SetWaitableTimer.
  58  m :    LARGE_INTEGER interval_;
  59    :  
  60  m :    DISALLOW_COPY_AND_ASSIGN(WaitableTimerImpl);
  61  m :  };
  62    :  
  63  m :  }  // namespace kasko
  64    :  
  65    :  #endif  // SYZYGY_KASKO_WAITABLE_TIMER_IMPL_H_