Alexander Terekhov wrote:
[...]
>  Err.      m_retry_event.wait(), m_retry_event.set();

I mean

  void lock() throw() {
    if (int lock_status = m_lock_status.cas(0, 1, msync::ddacq)) {
      do if (lock_status < 0 || m_lock_status.cas(1,-1, msync::ddacq))
        m_retry_event.wait();
      while (lock_status = m_lock_status.cas(0, 1, msync::ddacq));
      m_retry_event.set();
    }
  } 

  bool trylock() throw() {
    return !m_lock_status.cas(0, 1, msync::ddacq);
  }

  void unlock() throw() {
    if (m_lock_status.swap(0, msync::rel) < 0) 
      m_retry_event.set();
  } 

Can't currently think of something better than that.

regards,
alexander.

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