system_wrappers: rename interface -> include

webrtc/system_wrappers/interface/atomic32.h

-/*
- *  Copyright (c) 2012 The WebRTC 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 in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-// Atomic, system independent 32-bit integer.  Unless you know what you're
-// doing, use locks instead! :-)
-//
-// Note: assumes 32-bit (or higher) system
-#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_
-#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_
-
-#include <stddef.h>
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/common_types.h"
-
-namespace webrtc {
-
-// 32 bit atomic variable.  Note that this class relies on the compiler to
-// align the 32 bit value correctly (on a 32 bit boundary), so as long as you're
-// not doing things like reinterpret_cast over some custom allocated memory
-// without being careful with alignment, you should be fine.
-class Atomic32 {
- public:
-  Atomic32(int32_t initial_value = 0);
-  ~Atomic32();
-
-  // Prefix operator!
-  int32_t operator++();
-  int32_t operator--();
-
-  int32_t operator+=(int32_t value);
-  int32_t operator-=(int32_t value);
-
-  // Sets the value atomically to new_value if the value equals compare value.
-  // The function returns true if the exchange happened.
-  bool CompareExchange(int32_t new_value, int32_t compare_value);
-  int32_t Value() {
-    return *this += 0;
-  }
-
- private:
-  // Disable the + and - operator since it's unclear what these operations
-  // should do.
-  Atomic32 operator+(const Atomic32& other);
-  Atomic32 operator-(const Atomic32& other);
-
-  // Checks if |_value| is 32bit aligned.
-  inline bool Is32bitAligned() const {
-    return (reinterpret_cast<ptrdiff_t>(&value_) & 3) == 0;
-  }
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(Atomic32);
-
-  int32_t value_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_