Module sync 

Simple synchronization primitives (SpinLock, Once) for no_std environments. Minimal synchronization primitives for no_std kernels.

These primitives are intentionally simple and are meant as building blocks. They are not a full-featured synchronization library.

Important caveats

• No fairness guarantees: spin locks may starve.
• Not preemption-safe by themselves: if your kernel is preemptive or can be interrupted, you may need to disable interrupts or otherwise ensure lock-holding sections are safe.
• Single-core vs multi-core: on SMP systems, these use atomics and are safe provided your platform’s memory model matches Rust’s atomic semantics.

Structs

Once

A minimal, spin-based Once initializer.

SpinLock

A simple spin lock.

SpinLockGuard

RAII guard returned by SpinLock::lock.