Enum FutexLockMode 

pub enum FutexLockMode {
    Pi,
    Plain,
}

Whether WorkType::PriorityInversion uses a PI-aware mutex or a plain futex.

Pi exercises FUTEX_LOCK_PI and the rt_mutex priority-boost chain (kernel/futex/pi.c). When the low-priority lock holder is preempted by a medium-priority worker, the kernel boosts the holder to the high-priority waiter’s priority for the duration of the hold — both unblocking high and pinning medium from preempting it. Plain uses a non-PI futex so the inversion is left unrepaired and the scheduler must surface the stall.

Carried as a typed wrapper rather than a bool to avoid positional-argument confusion at call sites and so the failure-dump diagnostic names the choice explicitly (“pi_mode = Pi” vs “pi_mode = Plain”) instead of a bare boolean.

Variants

Pi

FUTEX_LOCK_PI with rt_mutex PI chain.

Plain

Plain futex (no PI boost). The default — exercises the uncorrected inversion the workload exists to surface.

Trait Implementations

impl Clone for FutexLockMode

fn clone(&self) -> FutexLockMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FutexLockMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FutexLockMode

fn default() -> FutexLockMode

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for FutexLockMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for FutexLockMode

fn eq(&self, other: &FutexLockMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for FutexLockMode

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for FutexLockMode

impl Eq for FutexLockMode

impl StructuralPartialEq for FutexLockMode