chromium之ThreadLocalStorage

看看头文件怎么用

// 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:

    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();

ThreadLocalStorage::Slot slot = new ThreadLocalStorage::Slot(..)

slot->Initialize

slot->Set

slot->Get

有个测试用例，蛮看一看

TEST(ThreadLocalStorageTest, Basics) {

  ThreadLocalStorage::Slot slot;

  slot.Set(reinterpret_cast<void*>());

  int value = reinterpret_cast<intptr_t>(slot.Get());

  EXPECT_EQ(value, );

}