43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
use std::sync::atomic::{AtomicUsize, Ordering};
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use std::thread;
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static FLAG: AtomicUsize = AtomicUsize::new(0);
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fn spin() {
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let j = thread::spawn(|| {
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while FLAG.load(Ordering::Acquire) == 0 {
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// We do *not* yield, and yet this should terminate eventually.
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}
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});
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thread::yield_now(); // schedule the other thread
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FLAG.store(1, Ordering::Release);
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j.join().unwrap();
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}
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fn two_player_ping_pong() {
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static FLAG: AtomicUsize = AtomicUsize::new(0);
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let waiter1 = thread::spawn(|| {
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while FLAG.load(Ordering::Acquire) == 0 {
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// We do *not* yield, and yet this should terminate eventually.
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}
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});
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let waiter2 = thread::spawn(|| {
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while FLAG.load(Ordering::Acquire) == 0 {
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// We do *not* yield, and yet this should terminate eventually.
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}
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});
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let progress = thread::spawn(|| {
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FLAG.store(1, Ordering::Release);
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});
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// The first `join` blocks the main thread and thus takes it out of the equation.
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waiter1.join().unwrap();
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waiter2.join().unwrap();
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progress.join().unwrap();
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}
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fn main() {
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spin();
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two_player_ping_pong();
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}
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