use std::sync::{Arc, Mutex};
use std::thread;
+use std::time::Duration;
//@ We already saw that we can use `Arc` to share memory between threads. However, `Arc` can only provide *read-only*
//@ access to memory: Since there is aliasing, Rust cannot, in general, permit mutation. To implement shared-memory
let counter1 = counter.clone();
let handle1 = thread::spawn(move || {
for _ in 0..10 {
- thread::sleep_ms(15);
+ thread::sleep(Duration::from_millis(15));
counter1.increment(2);
}
});
let counter2 = counter.clone();
let handle2 = thread::spawn(move || {
for _ in 0..10 {
- thread::sleep_ms(20);
+ thread::sleep(Duration::from_millis(20));
counter2.increment(3);
}
});
// Now we watch the threads working on the counter.
for _ in 0..50 {
- thread::sleep_ms(5);
+ thread::sleep(Duration::from_millis(5));
println!("Current value: {}", counter.get());
}
// **Exercise 15.1**: Add an operation `compare_and_inc(&self, test: usize, by: usize)` that increments the counter by
// `by` *only if* the current value is `test`.
//
-// **Exercise 15.2**: Rather than panicking in case the lock is poisoned, we can use `into_innter` on the error to recover
+// **Exercise 15.2**: Rather than panicking in case the lock is poisoned, we can use `into_inner` on the error to recover
// the data inside the lock. Change the code above to do that. Try using `unwrap_or_else` for this job.
//@ ## `RwLock`
//@ In part 13, we talked about types that are marked `Send` and thus can be moved to another thread. However, we did *not*
//@ talk about the question whether a reference is `Send`. For `&mut T`, the answer is: It is `Send` whenever `T` is send.
//@ `&mut` allows moving values back and forth, it is even possible to [`swap`](https://doc.rust-lang.org/stable/std/mem/fn.swap.html)
-//@ the contents of two mutable references. So in terms of concurrency, sending a mutable, exclusive reference is very much like
+//@ the contents of two mutable references. So in terms of concurrency, sending a mutable, unique reference is very much like
//@ sending full ownership, in the sense that it can be used to move the object to another thread.
//@
//@ But what about `&T`, a shared reference? Without interior mutability, it would always be all-right to send such values.
//@ [Rust RFC](https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md), which contains a type `RcMut` that would be `Sync` and not `Send`.
//@ You may also be interested in [this blog post](https://huonw.github.io/blog/2015/02/some-notes-on-send-and-sync/) on the topic.
-//@ [index](main.html) | [previous](part14.html) | [raw source](https://www.ralfj.de/git/rust-101.git/blob_plain/HEAD:/workspace/src/part15.rs) | [next](part16.html)
+//@ [index](main.html) | [previous](part14.html) | [raw source](workspace/src/part15.rs) | [next](part16.html)