michaelkuc6/blog_os
1
0
Fork 0
mirror of https://github.com/phil-opp/blog_os.git synced 2025-12-16 22:37:49 +00:00
Code Issues Projects Releases Wiki Activity

Fix links that pointed to a redirection page (#447)

Browse Source
This commit is contained in:
Erlend
2018-07-01 18:58:00 +02:00
committed by Philipp Oppermann
parent 3365a4f9ff
commit 3e570a8cfb
4 changed files with 9 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
blog/content/first-edition/posts/04-printing-to-screen/index.md
View File

@@ -312,7 +312,7 @@ struct Buffer {
```
Instead of a `ScreenChar`, we're now using a `Volatile<ScreenChar>`. (The `Volatile` type is [generic] and can wrap (almost) any type). This ensures that we can't accidentally write to it through a “normal” write. Instead, we have to use the `write` method now.
[generic]: https://doc.rust-lang.org/book/generics.html
[generic]: https://doc.rust-lang.org/book/second-edition/ch10-00-generics.html
This means that we have to update our `Writer::write_byte` method:
@@ -442,7 +442,7 @@ But we can't use it to print anything! You can try it yourself in the `print_som
To resolve it, we could use a [mutable static]. But then every read and write to it would be unsafe since it could easily introduce data races and other bad things. Using `static mut` is highly discouraged, there are even proposals to [remove it][remove static mut].
[mutable static]: https://doc.rust-lang.org/book/const-and-static.html#mutability
[mutable static]: https://doc.rust-lang.org/book/second-edition/ch19-01-unsafe-rust.html#accessing-or-modifying-a-mutable-static-variable
[remove static mut]: https://internals.rust-lang.org/t/pre-rfc-remove-static-mut/1437
But what are the alternatives? We could try to use a cell type like [RefCell] or even [UnsafeCell] to provide [interior mutability]. But these types aren't [Sync] \(with good reason), so we can't use them in statics.
@@ -505,7 +505,7 @@ Note that we need to import the `Write` trait if we want to use its functions.
## A println macro
Rust's [macro syntax] is a bit strange, so we won't try to write a macro from scratch. Instead we look at the source of the [`println!` macro] in the standard library:
[macro syntax]: https://doc.rust-lang.org/nightly/book/macros.html
[macro syntax]: https://doc.rust-lang.org/nightly/book/second-edition/appendix-04-macros.html
[`println!` macro]: https://doc.rust-lang.org/nightly/std/macro.println!.html
```rust