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extern crate cortex_m_rtfm as rtfm;
use rtfm::{C16, C2, P1, P16, P2, P3, Resource};
static R1: Resource<i32, C2> = Resource::new(0);
// You CAN'T lock a resource with ceiling C from a task with priority P if P > C
fn j1(prio: P3) {
let ceil = prio.as_ceiling();
rtfm::raise_to(ceil, &R1, |ceil| {
//~^ error
});
}
// DON'T lock a resource with ceiling equal to the task priority.
// Instead use `borrow`
fn j2(prio: P2) {
let ceil = prio.as_ceiling();
rtfm::raise_to(ceil, &R1, |_| {});
//~^ error
// OK
let r1 = R1.borrow(&prio, ceil);
}
// You CAN lock a resource with ceiling C from a task with priority P if C > P
fn j3(prio: P1) {
let ceil = prio.as_ceiling();
// OK
rtfm::raise_to(ceil, &R1, |ceil| {
let r1 = R1.borrow(&prio, ceil);
})
}
static R2: Resource<i32, C16> = Resource::new(0);
// Tasks with priority less than P16 can't lock a resource with ceiling C16
fn j4(prio: P1) {
let ceil = prio.as_ceiling();
rtfm::raise_to(ceil, &R2, |ceil| {
//~^ error
});
}
// Only tasks with priority P16 can claim a resource with ceiling C16
fn j5(prio: P16) {
// OK
let r2 = R2.borrow(&prio, prio.as_ceiling());
}
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