Module sync 

Modules

atomic

Atomic abstractions for single and multi-core systems.

once

spinlock

Synchronization primitives.

waiter

Single-consumer park/wake primitive: at most one thread parks per ParkedWaiter at a time. Producers call wake from IRQ context (lock-free); consumers call park / park_current, or drive arming and parking themselves with arm / disarm. A second concurrent consumer is rejected with EBUSY.