Move base to DEPS

base/atomic_ref_count.h

-// Copyright (c) 2011 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.
-
-// This is a low level implementation of atomic semantics for reference
-// counting.  Please use base/memory/ref_counted.h directly instead.
-
-#ifndef BASE_ATOMIC_REF_COUNT_H_
-#define BASE_ATOMIC_REF_COUNT_H_
-
-#include "base/atomicops.h"
-
-namespace base {
-
-typedef subtle::Atomic32 AtomicRefCount;
-
-// Increment a reference count by "increment", which must exceed 0.
-inline void AtomicRefCountIncN(volatile AtomicRefCount *ptr,
-                               AtomicRefCount increment) {
-  subtle::NoBarrier_AtomicIncrement(ptr, increment);
-}
-
-// Decrement a reference count by "decrement", which must exceed 0,
-// and return whether the result is non-zero.
-// Insert barriers to ensure that state written before the reference count
-// became zero will be visible to a thread that has just made the count zero.
-inline bool AtomicRefCountDecN(volatile AtomicRefCount *ptr,
-                               AtomicRefCount decrement) {
-  bool res = (subtle::Barrier_AtomicIncrement(ptr, -decrement) != 0);
-  return res;
-}
-
-// Increment a reference count by 1.
-inline void AtomicRefCountInc(volatile AtomicRefCount *ptr) {
-  base::AtomicRefCountIncN(ptr, 1);
-}
-
-// Decrement a reference count by 1 and return whether the result is non-zero.
-// Insert barriers to ensure that state written before the reference count
-// became zero will be visible to a thread that has just made the count zero.
-inline bool AtomicRefCountDec(volatile AtomicRefCount *ptr) {
-  return base::AtomicRefCountDecN(ptr, 1);
-}
-
-// Return whether the reference count is one.  If the reference count is used
-// in the conventional way, a refrerence count of 1 implies that the current
-// thread owns the reference and no other thread shares it.  This call performs
-// the test for a reference count of one, and performs the memory barrier
-// needed for the owning thread to act on the object, knowing that it has
-// exclusive access to the object.
-inline bool AtomicRefCountIsOne(volatile AtomicRefCount *ptr) {
-  bool res = (subtle::Acquire_Load(ptr) == 1);
-  return res;
-}
-
-// Return whether the reference count is zero.  With conventional object
-// referencing counting, the object will be destroyed, so the reference count
-// should never be zero.  Hence this is generally used for a debug check.
-inline bool AtomicRefCountIsZero(volatile AtomicRefCount *ptr) {
-  bool res = (subtle::Acquire_Load(ptr) == 0);
-  return res;
-}
-
-}  // namespace base
-
-#endif  // BASE_ATOMIC_REF_COUNT_H_