Method ThreadLocalProxy

scripts/perf-counters/src/thread-local.h:706–708

* Constructor that has to be called from a thread-neutral place. */

   * Constructor that has to be called from a thread-neutral place.
   */
  ThreadLocalProxy() : m_key(0) {
    ThreadLocalCreateKey(&m_key, nullptr);
  }

  T *get() const {
    T *obj = (T*)pthread_getspecific(m_key);