Move base to DEPS

base/lazy_instance.cc

-// 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.
-
-#include "base/lazy_instance.h"
-
-#include "base/at_exit.h"
-#include "base/atomicops.h"
-#include "base/basictypes.h"
-#include "base/threading/platform_thread.h"
-
-namespace base {
-namespace internal {
-
-// TODO(joth): This function could be shared with Singleton, in place of its
-// WaitForInstance() call.
-bool NeedsLazyInstance(subtle::AtomicWord* state) {
-  // Try to create the instance, if we're the first, will go from 0 to
-  // kLazyInstanceStateCreating, otherwise we've already been beaten here.
-  // The memory access has no memory ordering as state 0 and
-  // kLazyInstanceStateCreating have no associated data (memory barriers are
-  // all about ordering of memory accesses to *associated* data).
-  if (subtle::NoBarrier_CompareAndSwap(state, 0,
-                                       kLazyInstanceStateCreating) == 0)
-    // Caller must create instance
-    return true;
-
-  // It's either in the process of being created, or already created. Spin.
-  // The load has acquire memory ordering as a thread which sees
-  // state_ == STATE_CREATED needs to acquire visibility over
-  // the associated data (buf_). Pairing Release_Store is in
-  // CompleteLazyInstance().
-  while (subtle::Acquire_Load(state) == kLazyInstanceStateCreating) {
-    PlatformThread::YieldCurrentThread();
-  }
-  // Someone else created the instance.
-  return false;
-}
-
-void CompleteLazyInstance(subtle::AtomicWord* state,
-                          subtle::AtomicWord new_instance,
-                          void* lazy_instance,
-                          void (*dtor)(void*)) {
-  // Instance is created, go from CREATING to CREATED.
-  // Releases visibility over private_buf_ to readers. Pairing Acquire_Load's
-  // are in NeedsInstance() and Pointer().
-  subtle::Release_Store(state, new_instance);
-
-  // Make sure that the lazily instantiated object will get destroyed at exit.
-  if (dtor)
-    AtExitManager::RegisterCallback(dtor, lazy_instance);
-}
-
-}  // namespace internal
-}  // namespace base