Merge pull request #2 from wheals/master

[rust-101.git] / src / part15.rs

diff --git a/src/part15.rs b/src/part15.rs
index 9ae5aaf93dd62c9508bc5119a33381490a7c3d19..3b598255c0705f58d01c808700e31a5d670b3c01 100644 (file)
--- a/src/part15.rs
+++ b/src/part15.rs
@@ -10,7 +10,8 @@ use std::thread;
 //@ there are no data races. In Rust, shared-memory concurrency is obtained through *interior mutability*,
 //@ which we already discussed in a single-threaded context in part 12.
 //@ 
 //@ there are no data races. In Rust, shared-memory concurrency is obtained through *interior mutability*,
 //@ which we already discussed in a single-threaded context in part 12.
 //@ 

-//@ The most basic type for interior mutability that supports concurrency is [`Mutex<T>`](http://doc.rust-lang.org/stable/std/sync/struct.Mutex.html).
+//@ ## `Mutex`
+//@ The most basic type for interior mutability that supports concurrency is [`Mutex<T>`](https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html).

 //@ This type implements *critical sections* (or *locks*), but in a data-driven way: One has to specify
 //@ the type of the data that's protected by the mutex, and Rust ensures that the data is *only* accessed
 //@ through the mutex. In other words, "lock data, not code" is actually enforced by the type system, which
 //@ This type implements *critical sections* (or *locks*), but in a data-driven way: One has to specify
 //@ the type of the data that's protected by the mutex, and Rust ensures that the data is *only* accessed
 //@ through the mutex. In other words, "lock data, not code" is actually enforced by the type system, which


@@ -102,7 +103,7 @@ pub fn main() {
 // the data inside the lock. Change the code above to do that. Try using `unwrap_or_else` for this job.
 
 //@ ## `RwLock`
 // the data inside the lock. Change the code above to do that. Try using `unwrap_or_else` for this job.
 
 //@ ## `RwLock`

-//@ Besides `Mutex`, there's also [`RwLock`](http://doc.rust-lang.org/stable/std/sync/struct.RwLock.html), which
+//@ Besides `Mutex`, there's also [`RwLock`](https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html), which

 //@ provides two ways of locking: One that grants only read-only access, to any number of concurrent readers, and another one
 //@ for exclusive write access. Notice that this is the same pattern we already saw with shared vs. mutable borrows. Hence
 //@ another way of explaining `RwLock` is to say that it is like `RefCell`, but works even for concurrent access. Rather than
 //@ provides two ways of locking: One that grants only read-only access, to any number of concurrent readers, and another one
 //@ for exclusive write access. Notice that this is the same pattern we already saw with shared vs. mutable borrows. Hence
 //@ another way of explaining `RwLock` is to say that it is like `RefCell`, but works even for concurrent access. Rather than


@@ -111,14 +112,14 @@ pub fn main() {
 
 // **Exercise 15.3**:  Change the code above to use `RwLock`, such that multiple calls to `get` can be executed at the same time.
 
 
 // **Exercise 15.3**:  Change the code above to use `RwLock`, such that multiple calls to `get` can be executed at the same time.
 

-//@ ## Sync
+//@ ## `Sync`

 //@ Clearly, if we had used `RefCell` rather than `Mutex`, the code above could not work: `RefCell` is not prepared for
 //@ multiple threads trying to access the data at the same time. How does Rust make sure that we don't accidentally use
 //@ `RefCell` across multiple threads?
 //@ 
 //@ 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 borrow is `Send`. For `&mut T`, the answer is: It is `Send` whenever `T` is send.
 //@ Clearly, if we had used `RefCell` rather than `Mutex`, the code above could not work: `RefCell` is not prepared for
 //@ multiple threads trying to access the data at the same time. How does Rust make sure that we don't accidentally use
 //@ `RefCell` across multiple threads?
 //@ 
 //@ 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 borrow 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`](http://doc.rust-lang.org/beta/std/mem/fn.swap.html)
+//@ `&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 mutably borrowed values. So in terms of concurrency, sending a mutable borrow is very much like
 //@ sending full ownership, in the sense that it can be used to move the object to another thread.
 //@ 
 //@ the contents of two mutably borrowed values. So in terms of concurrency, sending a mutable borrow is very much like
 //@ sending full ownership, in the sense that it can be used to move the object to another thread.
 //@ 


@@ -143,4 +144,4 @@ 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.
 
 //@ [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) | [next](main.html)
+//@ [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)