Struct Atomic CpuId &nbsp; Copy item path

impl AtomicCpuId

pub const NONE: u32 = u32::MAX

The null value of CPUID.

An AtomicCpuId with AtomicCpuId::NONE as its inner value is empty.

pub exec fn set_if_is_none(&self, cpu_id: CpuId) -> ret : Result<(), CpuId>

with

Tracked(perm): Tracked<&mut PermissionU32>,

requires

old(perm).view().patomic == self.patomic_id(),

Self::inv_value(old(perm).view().value),

ensures

self.patomic_id() == final(perm).view().patomic,

ret is Ok ==> final(perm).view().value == cpu_id.as_usize() as u32,

ret matches Err(
    prev,
) ==> prev@ == old(perm).view().value
    && final(perm).view().value == old(perm).view().value,

Self::inv_value(final(perm).view().value),

Sets the inner value of an AtomicCpuId if it’s empty.

The return value is a result indicating whether the new value was written and containing the previous value. If the previous value is empty, it returns Ok(()). Otherwise, it returns Err(previous_value) which the previous value is a valid CPU ID.

pub exec fn set_anyway(&self, cpu_id: CpuId)

with

Tracked(perm): Tracked<&mut PermissionU32>,

requires

old(perm).view().patomic == self.patomic_id(),

ensures

self.patomic_id() == final(perm).view().patomic,

final(perm).view().value == cpu_id.as_usize() as u32,

Self::inv_value(final(perm).view().value),

Sets the inner value of an AtomicCpuId anyway.

pub exec fn set_to_none(&self)

with

Tracked(perm): Tracked<&mut PermissionU32>,

requires

old(perm).view().patomic == self.patomic_id(),

ensures

self.patomic_id() == final(perm).view().patomic,

final(perm).view().value == Self::NONE,

Self::inv_value(final(perm).view().value),

Sets the inner value of an AtomicCpuId to AtomicCpuId::NONE, i.e. makes an AtomicCpuId empty.

pub exec fn get(&self) -> ret : Option<CpuId>

with

Tracked(perm): Tracked<&PermissionU32>,

requires

perm.view().patomic == self.patomic_id(),

Self::inv_value(perm.view().value),

ensures

ret is None == (perm.view().value == Self::NONE),

ret matches Some(id) ==> id@ == perm.view().value,

Gets the inner value of an AtomicCpuId.

pub closed spec fn patomic_id(&self) -> int

The identity of the inner atomic cell, for tying permissions to self. A closed helper, since a pub contract cannot use the private field.

pub open spec fn inv_value(v: u32) -> bool

{ v == Self::NONE || 0 <= v < cpu_count() }

The trace invariant of the CPUID cell: the stored word is the null constant NONE or encodes a valid CPU ID (below the CPU count).

Trait Implementations§

impl Default for AtomicCpuId

fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

impl UnwindSafe for AtomicCpuId

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