68                 let init = |slot: *mut UnsafeCell<libc::pthread_mutex_t>| {  in new()
70                     let slot: *mut libc::pthread_mutex_t = slot.cast();  in new()
71                     let mut attr = MaybeUninit::uninit();  in new()
72                     let attr = attr.as_mut_ptr();  in new()
74                     let ret = unsafe { libc::pthread_mutexattr_init(attr) };  in new()
79                     let ret = unsafe {  in new()
90                     let ret = unsafe { libc::pthread_mutex_init(slot, attr) };  in new()
155         let mtx: Pin<Arc<PThreadMutex<usize>>> = Arc::try_pin_init(PThreadMutex::new(0)).unwrap();  in main()
156         let mut handles = vec![];  in main()
157         let thread_count = 20;  in main()
158         let workload = 1_000_000;  in main()
160             let mtx = mtx.clone();  in main()