Struct chalk_integration::query::OrphanCheckQuery
source · pub struct OrphanCheckQuery;
Implementations§
source§impl OrphanCheckQuery
impl OrphanCheckQuery
sourcepub fn in_db(self, db: &dyn LoweringDatabase) -> QueryTable<'_, Self>
pub fn in_db(self, db: &dyn LoweringDatabase) -> QueryTable<'_, Self>
Get access to extra methods pertaining to this query. For
example, you can use this to run the GC (sweep
) across a
single input. You can also use it to invoke this query, though
it’s more common to use the trait method on the database
itself.
source§impl OrphanCheckQuery
impl OrphanCheckQuery
sourcepub fn in_db_mut(self, db: &mut dyn LoweringDatabase) -> QueryTableMut<'_, Self>
pub fn in_db_mut(self, db: &mut dyn LoweringDatabase) -> QueryTableMut<'_, Self>
Like in_db
, but gives access to methods for setting the
value of an input. Not applicable to derived queries.
§Threads, cancellation, and blocking
Mutating the value of a query cannot be done while there are
still other queries executing. If you are using your database
within a single thread, this is not a problem: you only have
&self
access to the database, but this method requires &mut self
.
However, if you have used snapshot
to create other threads,
then attempts to set
will block the current thread until
those snapshots are dropped (usually when those threads
complete). This also implies that if you create a snapshot but
do not send it to another thread, then invoking set
will
deadlock.
Before blocking, the thread that is attempting to set
will
also set a cancellation flag. In the threads operating on
snapshots, you can use the is_current_revision_canceled
method to check for this flag and bring those operations to a
close, thus allowing the set
to succeed. Ignoring this flag
may lead to “starvation”, meaning that the thread attempting
to set
has to wait a long, long time. =)
Trait Implementations§
source§impl Debug for OrphanCheckQuery
impl Debug for OrphanCheckQuery
source§impl Default for OrphanCheckQuery
impl Default for OrphanCheckQuery
source§fn default() -> OrphanCheckQuery
fn default() -> OrphanCheckQuery
source§impl Query for OrphanCheckQuery
impl Query for OrphanCheckQuery
§type Key = ()
type Key = ()
§type Value = Result<(), ChalkError>
type Value = Result<(), ChalkError>
§type Storage = DerivedStorage<OrphanCheckQuery, AlwaysMemoizeValue>
type Storage = DerivedStorage<OrphanCheckQuery, AlwaysMemoizeValue>
source§const QUERY_INDEX: u16 = 4u16
const QUERY_INDEX: u16 = 4u16
source§const QUERY_NAME: &'static str = "orphan_check"
const QUERY_NAME: &'static str = "orphan_check"
foo
)source§fn query_storage<'a>(
group_storage: &'a <Self as QueryDb<'_>>::GroupStorage,
) -> &'a Arc<Self::Storage>
fn query_storage<'a>( group_storage: &'a <Self as QueryDb<'_>>::GroupStorage, ) -> &'a Arc<Self::Storage>
source§impl<'d> QueryDb<'d> for OrphanCheckQuery
impl<'d> QueryDb<'d> for OrphanCheckQuery
§type DynDb = dyn LoweringDatabase + 'd
type DynDb = dyn LoweringDatabase + 'd
§type GroupStorage = LoweringDatabaseGroupStorage__
type GroupStorage = LoweringDatabaseGroupStorage__
Auto Trait Implementations§
impl Freeze for OrphanCheckQuery
impl RefUnwindSafe for OrphanCheckQuery
impl Send for OrphanCheckQuery
impl Sync for OrphanCheckQuery
impl Unpin for OrphanCheckQuery
impl UnwindSafe for OrphanCheckQuery
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> Cast for T
impl<T> Cast for T
source§fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
U
using CastTo
.