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263 lines
11 KiB
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11 KiB
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<main>
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<h1 id="message-passing--capacity"><a class="header" href="#message-passing--capacity">Message passing & capacity</a></h1>
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<p>Software tasks support message passing, this means that software tasks can be spawned
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with an argument: <code>foo::spawn(1)</code> which will run the task <code>foo</code> with the argument <code>1</code>.</p>
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<p>Capacity sets the size of the spawn queue for the task, if not specified capacity defaults to 1.</p>
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<p>In the example below, the capacity of task <code>foo</code> is <code>3</code>, allowing three simultaneous
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pending spawns of <code>foo</code>. Exceeding this capacity is an <code>Error</code>.</p>
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<p>The number of arguments to a task is not limited:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>//! examples/message_passing.rs
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#![deny(unsafe_code)]
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#![deny(warnings)]
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#![deny(missing_docs)]
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#![no_main]
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#![no_std]
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use panic_semihosting as _;
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#[rtic::app(device = lm3s6965, dispatchers = [SSI0])]
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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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#[local]
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struct Local {}
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#[init]
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fn init(_: init::Context) -> (Shared, Local, init::Monotonics) {
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foo::spawn(1, 1).unwrap();
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foo::spawn(1, 2).unwrap();
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foo::spawn(2, 3).unwrap();
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assert!(foo::spawn(1, 4).is_err()); // The capacity of `foo` is reached
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(Shared {}, Local {}, init::Monotonics())
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}
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#[task(capacity = 3)]
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fn foo(_c: foo::Context, x: i32, y: u32) {
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hprintln!("foo {}, {}", x, y);
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if x == 2 {
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debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
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}
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}
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}
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<span class="boring">}</span></code></pre></pre>
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<pre><code class="language-console">$ cargo run --target thumbv7m-none-eabi --example message_passing
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foo 1, 1
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foo 1, 2
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foo 2, 3
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</code></pre>
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