X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/63b7a79069a399c32d575bb71832fcad134117c9..d9f72d6ad261b7b8fe97fb80423780e8361abb86:/src/part15.rs diff --git a/src/part15.rs b/src/part15.rs index 47952d6..b1cab06 100644 --- a/src/part15.rs +++ b/src/part15.rs @@ -3,6 +3,7 @@ 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 @@ -70,7 +71,7 @@ pub fn main() { 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); } }); @@ -79,14 +80,14 @@ pub fn main() { 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()); } @@ -99,7 +100,7 @@ pub fn main() { // **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` @@ -120,7 +121,7 @@ pub fn main() { //@ 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. @@ -144,4 +145,4 @@ pub fn main() { //@ [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)