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use exponential backoff in lock_contended

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joboet 2023-04-18 19:01:37 +02:00
parent 61ce691522
commit 8db64b5e2d
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1 changed files with 4 additions and 2 deletions
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6
library/std/src/sys/pal/unix/locks/queue_rwlock.rs
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@ -114,7 +114,7 @@ use crate::sync::atomic::{
use crate::sys_common::thread_info;
use crate::thread::Thread;
const SPIN_COUNT: usize = 100;
const SPIN_COUNT: usize = 6;
type State = *mut ();
type AtomicState = AtomicPtr<()>;
@ -328,7 +328,9 @@ impl RwLock {
} else if state.addr() & QUEUED == 0 && count < SPIN_COUNT {
// If the lock is not available but no threads are queued, spin
// for a while.
spin_loop();
for _ in 0..(1 << count) {
spin_loop();
}
state = self.state.load(Relaxed);
count += 1;
} else {