text: Sizes of pthreads-win32 structs
  -------------------------------
                       pthread_t    8
                  ptw32_thread_t   96
                 pthread_attr_t_   28
                          sem_t_   12
                pthread_mutex_t_   28
            pthread_mutexattr_t_   12
             pthread_spinlock_t_    8
              pthread_barrier_t_   36
          pthread_barrierattr_t_    4
                  pthread_key_t_   16
                 pthread_cond_t_   32
             pthread_condattr_t_    4
               pthread_rwlock_t_   28
           pthread_rwlockattr_t_    4
                 pthread_once_t_   16
                 ptw32_cleanup_t   12
               ptw32_mcs_node_t_   16
                     sched_param    4
  -------------------------------
  