Move base to DEPS

base/threading/thread_local_storage.h

-// Copyright (c) 2012 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_THREADING_THREAD_LOCAL_STORAGE_H_
-#define BASE_THREADING_THREAD_LOCAL_STORAGE_H_
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#elif defined(OS_POSIX)
-#include <pthread.h>
-#endif
-
-namespace base {
-
-namespace internal {
-
-// WARNING: You should *NOT* be using this class directly.
-// PlatformThreadLocalStorage is low-level abstraction to the OS's TLS
-// interface, you should instead be using ThreadLocalStorage::StaticSlot/Slot.
-class BASE_EXPORT PlatformThreadLocalStorage {
- public:
-
-#if defined(OS_WIN)
-  typedef unsigned long TLSKey;
-  enum { TLS_KEY_OUT_OF_INDEXES = TLS_OUT_OF_INDEXES };
-#elif defined(OS_POSIX)
-  typedef pthread_key_t TLSKey;
-  // The following is a "reserved key" which is used in our generic Chromium
-  // ThreadLocalStorage implementation.  We expect that an OS will not return
-  // such a key, but if it is returned (i.e., the OS tries to allocate it) we
-  // will just request another key.
-  enum { TLS_KEY_OUT_OF_INDEXES = 0x7FFFFFFF };
-#endif
-
-  // The following methods need to be supported on each OS platform, so that
-  // the Chromium ThreadLocalStore functionality can be constructed.
-  // Chromium will use these methods to acquire a single OS slot, and then use
-  // that to support a much larger number of Chromium slots (independent of the
-  // OS restrictions).
-  // The following returns true if it successfully is able to return an OS
-  // key in |key|.
-  static bool AllocTLS(TLSKey* key);
-  // Note: FreeTLS() doesn't have to be called, it is fine with this leak, OS
-  // might not reuse released slot, you might just reset the TLS value with
-  // SetTLSValue().
-  static void FreeTLS(TLSKey key);
-  static void SetTLSValue(TLSKey key, void* value);
-  static void* GetTLSValue(TLSKey key);
-
-  // Each platform (OS implementation) is required to call this method on each
-  // terminating thread when the thread is about to terminate.  This method
-  // will then call all registered destructors for slots in Chromium
-  // ThreadLocalStorage, until there are no slot values remaining as having
-  // been set on this thread.
-  // Destructors may end up being called multiple times on a terminating
-  // thread, as other destructors may re-set slots that were previously
-  // destroyed.
-#if defined(OS_WIN)
-  // Since Windows which doesn't support TLS destructor, the implementation
-  // should use GetTLSValue() to retrieve the value of TLS slot.
-  static void OnThreadExit();
-#elif defined(OS_POSIX)
-  // |Value| is the data stored in TLS slot, The implementation can't use
-  // GetTLSValue() to retrieve the value of slot as it has already been reset
-  // in Posix.
-  static void OnThreadExit(void* value);
-#endif
-};
-
-}  // namespace internal
-
-// Wrapper for thread local storage.  This class doesn't do much except provide
-// an API for portability.
-class BASE_EXPORT 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);
-
-  // StaticSlot uses its own struct initializer-list style static
-  // initialization, as base's LINKER_INITIALIZED requires a constructor and on
-  // some compilers (notably gcc 4.4) this still ends up needing runtime
-  // initialization.
-  #define TLS_INITIALIZER {0}
-
-  // A key representing one value stored in TLS.
-  // Initialize like
-  //   ThreadLocalStorage::StaticSlot my_slot = TLS_INITIALIZER;
-  // If you're not using a static variable, use the convenience class
-  // ThreadLocalStorage::Slot (below) instead.
-  struct BASE_EXPORT StaticSlot {
-    // 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.
-    void 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_; }
-
-    // The internals of this struct should be considered private.
-    bool initialized_;
-    int slot_;
-  };
-
-  // A convenience wrapper around StaticSlot with a constructor. Can be used
-  // as a member variable.
-  class BASE_EXPORT Slot : public StaticSlot {
-   public:
-    // Calls StaticSlot::Initialize().
-    explicit Slot(TLSDestructorFunc destructor = NULL);
-
-   private:
-    using StaticSlot::initialized_;
-    using StaticSlot::slot_;
-
-    DISALLOW_COPY_AND_ASSIGN(Slot);
-  };
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage);
-};
-
-}  // namespace base
-
-#endif  // BASE_THREADING_THREAD_LOCAL_STORAGE_H_