text: // Copyright 2011 the V8 project 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 V8_PROFILER_CIRCULAR_QUEUE_INL_H_
  #define V8_PROFILER_CIRCULAR_QUEUE_INL_H_
  
  #include "src/profiler/circular-queue.h"
  
  namespace v8 {
  namespace internal {
  
  template<typename T, unsigned L>
  SamplingCircularQueue<T, L>::SamplingCircularQueue()
      : enqueue_pos_(buffer_),
        dequeue_pos_(buffer_) {
  }
  
  
  template<typename T, unsigned L>
  SamplingCircularQueue<T, L>::~SamplingCircularQueue() {
  }
  
  
  template<typename T, unsigned L>
  T* SamplingCircularQueue<T, L>::Peek() {
    base::MemoryBarrier();
    if (base::Acquire_Load(&dequeue_pos_->marker) == kFull) {
      return &dequeue_pos_->record;
    }
    return NULL;
  }
  
  
  template<typename T, unsigned L>
  void SamplingCircularQueue<T, L>::Remove() {
    base::Release_Store(&dequeue_pos_->marker, kEmpty);
    dequeue_pos_ = Next(dequeue_pos_);
  }
  
  
  template<typename T, unsigned L>
  T* SamplingCircularQueue<T, L>::StartEnqueue() {
    base::MemoryBarrier();
    if (base::Acquire_Load(&enqueue_pos_->marker) == kEmpty) {
      return &enqueue_pos_->record;
    }
    return NULL;
  }
  
  
  template<typename T, unsigned L>
  void SamplingCircularQueue<T, L>::FinishEnqueue() {
    base::Release_Store(&enqueue_pos_->marker, kFull);
    enqueue_pos_ = Next(enqueue_pos_);
  }
  
  
  template<typename T, unsigned L>
  typename SamplingCircularQueue<T, L>::Entry* SamplingCircularQueue<T, L>::Next(
      Entry* entry) {
    Entry* next = entry + 1;
    if (next == &buffer_[L]) return buffer_;
    return next;
  }
  
  } }  // namespace v8::internal
  
  #endif  // V8_PROFILER_CIRCULAR_QUEUE_INL_H_
  