Enum ProcessPriority 

#[non_exhaustive]
pub enum ProcessPriority {
    Normal,
    BelowNormal,
    Idle,
    Efficient,
}

Scheduling priority requested for the child. Normal (the default) means “inherit”: it leaves the spawn exactly as it was before this option existed, so the child keeps the parent’s priority class (Windows) or nice value (Unix). It does not reset a lowered parent back to normal. The other values only lower priority, which needs no privilege and never raises a value the child already inherits above a lower one.

Windows: BelowNormal adds BELOW_NORMAL_PRIORITY_CLASS and Idle adds IDLE_PRIORITY_CLASS to the creation flags. Unix: the child’s nice value is raised to at least 10 (BelowNormal) or 19 (Idle) between fork and exec.

Efficient is BelowNormal plus the platform’s energy-efficiency class, for background work that should not wake the fast cores. Windows: BELOW_NORMAL_PRIORITY_CLASS plus EcoQoS (PROCESS_POWER_THROTTLING_EXECUTION_SPEED through SetProcessInformation, set while the child is still suspended; a Windows without EcoQoS ignores it, best effort). macOS: nice 10 and the QOS_CLASS_UTILITY quality of service on the child’s initial thread (set between fork and exec; advisory). Other Unix: nice 10.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Normal

BelowNormal

Idle

Efficient

Trait Implementations

impl Clone for ProcessPriority

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ProcessPriority

impl Debug for ProcessPriority

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

Formats the value using the given formatter.

impl Default for ProcessPriority

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ProcessPriority

impl PartialEq for ProcessPriority

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ProcessPriority