Module blocking 

proxima_primitives::sync::blocking — canonical tier-resolved BLOCKING mutex.

Folded from the former proxima-lock crate (Workstream F, RISC-dedup: proxima-lock had zero workspace consumers — an adoption gap, not dead code). One Mutex<T> API, backend chosen by tier:

• std (default): re-exports parking_lot::{Mutex, MutexGuard} unchanged — a genuine passthrough, no behavior change for std consumers.
• no_std + blocking: lock_api::Mutex over a futex raw mutex (futex::RawFutexMutex) backed by atomic-wait (Linux futex, macOS __ulock, Windows WaitOnAddress).

There is deliberately no spin fallback: a blocking lock needs an OS wait primitive, so no_std with neither std nor blocking exposes no Mutex at all rather than silently degrading to a spinlock.

This module’s Mutex PARKS a real OS thread — the lock-of-last-resort outside async contexts per the workspace hot-path discipline. It is deliberately namespaced away from crate::sync::Mutex (the crate-root ASYNC mutex, futures::lock::Mutex-backed, which yields the task instead of parking a thread) so the two never collide under one name.

Structs

Condvar

A Condition Variable

Type Aliases

Mutex

A mutual exclusion primitive useful for protecting shared data

MutexGuard

An RAII implementation of a “scoped lock” of a mutex. When this structure is dropped (falls out of scope), the lock will be unlocked.