Sizes of pthreads-win32 structs

-------------------------------

                     pthread_t    8

                ptw32_thread_t  140

               pthread_attr_t_   28

                        sem_t_   12

              pthread_mutex_t_   24

          pthread_mutexattr_t_    8

           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

-------------------------------