64                 let init = |slot: *mut UnsafeCell<libc::pthread_mutex_t>| {  in new()
66                     let slot: *mut libc::pthread_mutex_t = slot.cast();  in new()
67                     let mut attr = MaybeUninit::uninit();  in new()
68                     let attr = attr.as_mut_ptr();  in new()
70                     let ret = unsafe { libc::pthread_mutexattr_init(attr) };  in new()
75                     let ret = unsafe {  in new()
86                     let ret = unsafe { libc::pthread_mutex_init(slot, attr) };  in new()
149         let mtx: Pin<Arc<PThreadMutex<usize>>> = Arc::try_pin_init(PThreadMutex::new(0)).unwrap();  in main()
150         let mut handles = vec![];  in main()
151         let thread_count = 20;  in main()
152         let workload = 1_000_000;  in main()
154             let mtx = mtx.clone();  in main()