pub const SafetyLock = struct {
    state: State = if (runtime_safety) .unlocked else .unknown,

    pub const State = if (runtime_safety) enum { unlocked, locked } else enum { unknown };

    pub fn lock(l: *SafetyLock) void {
        if (!runtime_safety) return;
        assert(l.state == .unlocked);
        l.state = .locked;
    }

    pub fn unlock(l: *SafetyLock) void {
        if (!runtime_safety) return;
        assert(l.state == .locked);
        l.state = .unlocked;
    }

    pub fn assertUnlocked(l: SafetyLock) void {
        if (!runtime_safety) return;
        assert(l.state == .unlocked);
    }

    pub fn assertLocked(l: SafetyLock) void {
        if (!runtime_safety) return;
        assert(l.state == .locked);
    }
}