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Simplify ARM run_enqueue

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Dániel Buga 2024-12-17 17:14:59 +01:00
parent c6ca46c825
commit 889b419fc4
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1 changed files with 3 additions and 18 deletions
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21
embassy-executor/src/raw/state_atomics_arm.rs
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@ -1,4 +1,3 @@
use core::arch::asm;
use core::sync::atomic::{compiler_fence, AtomicBool, AtomicU32, Ordering};
#[derive(Clone, Copy)]
@ -67,24 +66,10 @@ impl State {
/// function if the task was successfully marked.
#[inline(always)]
pub fn run_enqueue(&self, f: impl FnOnce(Token)) {
unsafe {
loop {
let state: u32;
asm!("ldrex {}, [{}]", out(reg) state, in(reg) self, options(nostack));
let old = self.run_queued.swap(true, Ordering::AcqRel);
if state & STATE_RUN_QUEUED != 0 {
asm!("clrex", options(nomem, nostack));
return;
}
let outcome: usize;
let new_state = state | STATE_RUN_QUEUED;
asm!("strex {}, {}, [{}]", out(reg) outcome, in(reg) new_state, in(reg) self, options(nostack));
if outcome == 0 {
locked(f);
return;
}
}
if !old {
locked(f);
}
}