Move heap and CPU profilers into a dedicated directory.

src/circular-queue.h

-// Copyright 2010 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_CIRCULAR_QUEUE_H_
-#define V8_CIRCULAR_QUEUE_H_
-
-#include "src/base/atomicops.h"
-#include "src/globals.h"
-
-namespace v8 {
-namespace internal {
-
-
-// Lock-free cache-friendly sampling circular queue for large
-// records. Intended for fast transfer of large records between a
-// single producer and a single consumer. If the queue is full,
-// StartEnqueue will return NULL. The queue is designed with
-// a goal in mind to evade cache lines thrashing by preventing
-// simultaneous reads and writes to adjanced memory locations.
-template<typename T, unsigned Length>
-class SamplingCircularQueue {
- public:
-  // Executed on the application thread.
-  SamplingCircularQueue();
-  ~SamplingCircularQueue();
-
-  // StartEnqueue returns a pointer to a memory location for storing the next
-  // record or NULL if all entries are full at the moment.
-  T* StartEnqueue();
-  // Notifies the queue that the producer has complete writing data into the
-  // memory returned by StartEnqueue and it can be passed to the consumer.
-  void FinishEnqueue();
-
-  // Executed on the consumer (analyzer) thread.
-  // Retrieves, but does not remove, the head of this queue, returning NULL
-  // if this queue is empty. After the record had been read by a consumer,
-  // Remove must be called.
-  T* Peek();
-  void Remove();
-
- private:
-  // Reserved values for the entry marker.
-  enum {
-    kEmpty,  // Marks clean (processed) entries.
-    kFull    // Marks entries already filled by the producer but not yet
-             // completely processed by the consumer.
-  };
-
-  struct V8_ALIGNED(PROCESSOR_CACHE_LINE_SIZE) Entry {
-    Entry() : marker(kEmpty) {}
-    T record;
-    base::Atomic32 marker;
-  };
-
-  Entry* Next(Entry* entry);
-
-  Entry buffer_[Length];
-  V8_ALIGNED(PROCESSOR_CACHE_LINE_SIZE) Entry* enqueue_pos_;
-  V8_ALIGNED(PROCESSOR_CACHE_LINE_SIZE) Entry* dequeue_pos_;
-
-  DISALLOW_COPY_AND_ASSIGN(SamplingCircularQueue);
-};
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_CIRCULAR_QUEUE_H_