Move thread local stuff from base to base/threading and consistently use the...

base/thread_local_storage.h

-// Copyright (c) 2006-2008 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.
-
-#ifndef BASE_THREAD_LOCAL_STORAGE_H_
-#define BASE_THREAD_LOCAL_STORAGE_H_
-#pragma once
-
-#include "base/basictypes.h"
-
-#if defined(OS_POSIX)
-#include <pthread.h>
-#endif
-
-// Wrapper for thread local storage.  This class doesn't do much except provide
-// an API for portability.
-class ThreadLocalStorage {
- public:
-
-  // Prototype for the TLS destructor function, which can be optionally used to
-  // cleanup thread local storage on thread exit.  'value' is the data that is
-  // stored in thread local storage.
-  typedef void (*TLSDestructorFunc)(void* value);
-
-  // A key representing one value stored in TLS.
-  class Slot {
-   public:
-    explicit Slot(TLSDestructorFunc destructor = NULL);
-
-    // This constructor should be used for statics.
-    // It returns an uninitialized Slot.
-    explicit Slot(base::LinkerInitialized x) {}
-
-    // Set up the TLS slot.  Called by the constructor.
-    // 'destructor' is a pointer to a function to perform per-thread cleanup of
-    // this object.  If set to NULL, no cleanup is done for this TLS slot.
-    // Returns false on error.
-    bool Initialize(TLSDestructorFunc destructor);
-
-    // Free a previously allocated TLS 'slot'.
-    // If a destructor was set for this slot, removes
-    // the destructor so that remaining threads exiting
-    // will not free data.
-    void Free();
-
-    // Get the thread-local value stored in slot 'slot'.
-    // Values are guaranteed to initially be zero.
-    void* Get() const;
-
-    // Set the thread-local value stored in slot 'slot' to
-    // value 'value'.
-    void Set(void* value);
-
-    bool initialized() const { return initialized_; }
-
-   private:
-    // The internals of this struct should be considered private.
-    bool initialized_;
-#if defined(OS_WIN)
-    int slot_;
-#elif defined(OS_POSIX)
-    pthread_key_t key_;
-#endif
-
-    DISALLOW_COPY_AND_ASSIGN(Slot);
-  };
-
-#if defined(OS_WIN)
-  // Function called when on thread exit to call TLS
-  // destructor functions.  This function is used internally.
-  static void ThreadExit();
-
- private:
-  // Function to lazily initialize our thread local storage.
-  static void **Initialize();
-
- private:
-  // The maximum number of 'slots' in our thread local storage stack.
-  // For now, this is fixed.  We could either increase statically, or
-  // we could make it dynamic in the future.
-  static const int kThreadLocalStorageSize = 64;
-
-  static long tls_key_;
-  static long tls_max_;
-  static TLSDestructorFunc tls_destructors_[kThreadLocalStorageSize];
-#endif  // OS_WIN
-
-  DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage);
-};
-
-// Temporary backwards-compatible name.
-// TODO(evanm): replace all usage of TLSSlot.
-typedef ThreadLocalStorage::Slot TLSSlot;
-
-#endif  // BASE_THREAD_LOCAL_STORAGE_H_