X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/5fc4267c1ffd642bdaa4e403ccd8e9e12c8c1616..392c35cc88157a46418467782782ea95b91ba849:/src/part15.rs?ds=inline diff --git a/src/part15.rs b/src/part15.rs index ef5e9b4..e646d34 100644 --- a/src/part15.rs +++ b/src/part15.rs @@ -116,16 +116,15 @@ pub fn main() { // `unwrap_or_else` for this job. //@ ## `RwLock` - -//@ 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 references. Hence another way of explaining `RwLock` is to say that it is like -//@ `RefCell`, but works even for concurrent access. Rather than panicking when the data is already -//@ borrowed, `RwLock` will of course block the current thread until the lock is available. -//@ In this view, `Mutex` is a stripped-down version of `RwLock` that does not distinguish readers -//@ and writers. +//@ 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 references. Hence another way of explaining `RwLock` is to say that +//@ it is like `RefCell`, but works even for concurrent access. Rather than panicking when the data +//@ is already borrowed, `RwLock` will of course block the current thread until the lock is +//@ available. In this view, `Mutex` is a stripped-down version of `RwLock` that does not +//@ distinguish readers and writers. // **Exercise 15.3**: Change the code above to use `RwLock`, such that multiple calls to `get` can // be executed at the same time.