Method __try_lock_unless_stop_requested_

include/stdexec/stop_token.hpp:314–348

  }

  inline auto inplace_stop_source::__try_lock_unless_stop_requested_(bool __set_stop_requested)
    const noexcept -> bool
  {
    STDEXEC::__stok::__spin_wait __spin;
    auto                         __old_state = __state_.load(STDEXEC::__std::memory_order_relaxed);
    do
    {
      while (true)
      {
        if ((__old_state & __stop_requested_flag_) != 0)
        {
          // Stop already requested.
          return false;
        }
        else if (__old_state == 0)
        {
          break;
        }
        else
        {
          __spin.__wait();
          __old_state = __state_.load(STDEXEC::__std::memory_order_relaxed);
        }
      }
    }
    while (!__state_.compare_exchange_weak(__old_state,
                                           __set_stop_requested
                                             ? (__locked_flag_ | __stop_requested_flag_)
                                             : __locked_flag_,
                                           STDEXEC::__std::memory_order_acq_rel,
                                           STDEXEC::__std::memory_order_relaxed));

    // Lock acquired successfully
    return true;
  }

  inline auto inplace_stop_source::__try_add_callback_(STDEXEC::__stok::__inplace_stop_callback_base
                                                       * __callbk) const noexcept -> bool