Class PlatformThreadRef

src/butil/threading/platform_thread.h:41–65

Used for thread checking and debugging. Meant to be as fast as possible. These are produced by PlatformThread::CurrentRef(), and used to later check if we are on the same thread or not by using ==. These are safe to copy between threads, but can't be copied to another process as they have no meaning there. Also, the internal identifier can be re-used after a thread dies, so a PlatformThreadRef can

// after a thread dies, so a PlatformThreadRef cannot be reliably used
// to distinguish a new thread from an old, dead thread.
class PlatformThreadRef {
 public:
#if defined(OS_WIN)
  typedef DWORD RefType;
#elif defined(OS_POSIX)
  typedef pthread_t RefType;
#endif
  PlatformThreadRef()
      : id_(0) {
  }

  explicit PlatformThreadRef(RefType id)
      : id_(id) {
  }

  bool operator==(PlatformThreadRef other) const {
    return id_ == other.id_;
  }

  bool is_null() const {
    return id_ == 0;
  }
 private:
  RefType id_;
};

// Used to operate on threads.
class PlatformThreadHandle {