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Merge #411

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411: Add section about task_local and lock_free r=perlindgren a=AfoHT



Co-authored-by: Henrik Tjäder <henrik@tjaders.com>
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bors[bot] 2020-11-12 18:34:05 +00:00 committed by GitHub
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book/en/src/by-example/resources.md
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@ -102,3 +102,15 @@ In the example below a key (e.g. a cryptographic key) is loaded (or created) at
$ cargo run --example only-shared-access $ cargo run --example only-shared-access
{{#include ../../../../ci/expected/only-shared-access.run}} {{#include ../../../../ci/expected/only-shared-access.run}}
``` ```
## Lock-free resource access of mutable resources
There exists two other options dealing with resources
* `#[lock_free]`: there might be several tasks with the same priority
accessing the resource without critical section. Since tasks with the
same priority never can preempt another task on the same priority
this is safe.
* `#[task_local]`: there must be only one task using this resource,
similar to a `static mut` task local resource, but (optionally) set-up by init.