google base庫之simplethread

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// This is the base SimpleThread.  You can derive from it and implement the// virtual Run method, or you can use the DelegateSimpleThread interface.class BASE_EXPORT SimpleThread : public PlatformThread::Delegate { public:  class BASE_EXPORT Options {   public:    Options() : stack_size_(0) { }    ~Options() { }    // We use the standard compiler-supplied copy constructor.    // A custom stack size, or 0 for the system default.    void set_stack_size(size_t size) { stack_size_ = size; }    size_t stack_size() const { return stack_size_; }   private:    size_t stack_size_;  };  // Create a SimpleThread.  |options| should be used to manage any specific  // configuration involving the thread creation and management.  // Every thread has a name, in the form of |name_prefix|/TID, for example  // "my_thread/321".  The thread will not be created until Start() is called.  explicit SimpleThread(const std::string& name_prefix);  SimpleThread(const std::string& name_prefix, const Options& options);  virtual ~SimpleThread();  virtual void Start();  virtual void Join();  // Subclasses should override the Run method.  virtual void Run() = 0;  // Return the thread name prefix, or "unnamed" if none was supplied.  std::string name_prefix() { return name_prefix_; }  // Return the completed name including TID, only valid after Start().  std::string name() { return name_; }  // Return the thread id, only valid after Start().  PlatformThreadId tid() { return tid_; }  // Return True if Start() has ever been called.  bool HasBeenStarted();  // Return True if Join() has evern been called.  bool HasBeenJoined() { return joined_; }  // Overridden from PlatformThread::Delegate:  virtual void ThreadMain() OVERRIDE;  // Only set priorities with a careful understanding of the consequences.  // This is meant for very limited use cases.  void SetThreadPriority(ThreadPriority priority) {    PlatformThread::SetThreadPriority(thread_, priority);  } private:  const std::string name_prefix_;  std::string name_;  const Options options_;  PlatformThreadHandle thread_;  // PlatformThread handle, invalid after Join!  WaitableEvent event_;          // Signaled if Start() was ever called.  PlatformThreadId tid_;         // The backing thread‘s id.  bool joined_;                  // True if Join has been called.};

　　特別說明，由於需要快速學習，所以，我的文章中有些關於記憶的東西。

　　這個類相對還是比較簡單，就是對線程的簡單封裝，相比boost的thread簡直不知簡單到哪裡去，不過無所謂，簡單能辦事就可以。

　　重寫run函數實現自己的邏輯

  // Subclasses should override the Run method.  virtual void Run() = 0;

　　值得注意的就是下面這個資料成員

  WaitableEvent event_;          // Signaled if Start() was ever called.

　　到是註解中就說得很明白了，必需要start調用了這個event才置信。這個類先不管它吧，後面還在好戲，google的這個架構應當還是挺好用的，必竟是將thread的windows的訊息迴圈接合得比較緊密，後續文章再一一解開。

google base庫之simplethread