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12 KiB
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<div id="content" class="content">
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<main>
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<h1 id="resource-de-structure-ing"><a class="header" href="#resource-de-structure-ing">Resource de-structure-ing</a></h1>
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<p>Destructuring task resources might help readability if a task takes multiple
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resources. Here are two examples on how to split up the resource struct:</p>
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<pre><code class="language-rust noplayground">//! examples/destructure.rs
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#![no_main]
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#![no_std]
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#![deny(warnings)]
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#![deny(unsafe_code)]
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#![deny(missing_docs)]
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use panic_semihosting as _;
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#[rtic::app(device = lm3s6965, dispatchers = [UART0])]
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mod app {
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use cortex_m_semihosting::{debug, hprintln};
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#[shared]
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struct Shared {
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a: u32,
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b: u32,
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c: u32,
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}
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#[local]
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struct Local {}
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#[init]
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fn init(_: init::Context) -> (Shared, Local) {
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foo::spawn().unwrap();
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bar::spawn().unwrap();
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(Shared { a: 0, b: 1, c: 2 }, Local {})
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}
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#[idle]
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fn idle(_: idle::Context) -> ! {
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debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
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loop {}
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}
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// Direct destructure
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#[task(shared = [&a, &b, &c], priority = 1)]
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async fn foo(cx: foo::Context) {
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let a = cx.shared.a;
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let b = cx.shared.b;
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let c = cx.shared.c;
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hprintln!("foo: a = {}, b = {}, c = {}", a, b, c);
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}
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// De-structure-ing syntax
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#[task(shared = [&a, &b, &c], priority = 1)]
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async fn bar(cx: bar::Context) {
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let bar::SharedResources { a, b, c, .. } = cx.shared;
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hprintln!("bar: a = {}, b = {}, c = {}", a, b, c);
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}
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}</code></pre>
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<pre><code class="language-console">$ cargo xtask qemu --verbose --example destructure
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</code></pre>
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<pre><code class="language-console">bar: a = 0, b = 1, c = 2
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foo: a = 0, b = 1, c = 2
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</code></pre>
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