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502: book/resources: highlight that `#[lock_free]` includes a compile-time check r=AfoHT a=japaric

for the "same priority requirement"; this prevents data races

Co-authored-by: Jorge Aparicio <jorge.aparicio@ferrous-systems.com>
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bors[bot] 2021-07-22 10:51:16 +00:00 committed by GitHub
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book/en/src/by-example/resources.md
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@ -100,6 +100,7 @@ $ cargo run --example only-shared-access
A critical section is *not* required to access a `#[shared]` resource that's only accessed by tasks running at the *same* priority.
In this case, you can opt out of the `lock` API by adding the `#[lock_free]` field-level attribute to the resource declaration (see example below).
Note that this is merely a convenience: if you do use the `lock` API, at runtime the framework will *not* produce a critical section.
Also worth noting: using `#[lock_free]` on resources shared by tasks running at different priorities will result in a *compile-time* error -- not using the `lock` API would be a data race in that case.
``` rust
{{#include ../../../../examples/lock-free.rs}}