Function pollCallback

src/posix/libevent/libevent_poll.cpp:35–53

void pollCallback(evutil_socket_t, short what, void* arg)
{
  Poll* poll = reinterpret_cast<Poll*>(arg);

  if (poll->promise.future().hasDiscard()) {
    poll->promise.discard();
  } else {
    // Convert libevent specific EV_READ / EV_WRITE to io::* specific
    // values of these enumerations.
    short events =
      ((what & EV_READ) ? io::READ : 0) | ((what & EV_WRITE) ? io::WRITE : 0);

    poll->promise.set(events);
  }

  // Deleting the `poll` also destructs `ev` and hence triggers `event_free`,
  // which makes the event non-pending.
  delete poll;
}


void pollDiscard(const std::weak_ptr<event>& ev, short events)