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remove gc-token from WeakKeyDict #33825

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Nov 13, 2019
Merged

remove gc-token from WeakKeyDict #33825

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22 changes: 5 additions & 17 deletions base/weakkeydict.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
WeakKeyDict([itr])

`WeakKeyDict()` constructs a hash table where the keys are weak
references to objects, and thus may be garbage collected even when
references to objects which may be garbage collected even when
referenced in a hash table.

See [`Dict`](@ref) for further help. Note, unlike [`Dict`](@ref),
Expand Down Expand Up @@ -112,24 +112,12 @@ getindex(wkh::WeakKeyDict{K}, key) where {K} = lock(() -> getindex(wkh.ht, key),
isempty(wkh::WeakKeyDict) = isempty(wkh.ht)
length(t::WeakKeyDict) = length(t.ht)

function iterate(t::WeakKeyDict{K,V}) where V where K
gc_token = Ref{Bool}(false) # no keys will be deleted via finalizers until this token is gc'd
finalizer(gc_token) do r
if r[]
r[] = false
unlock(t.lock)
end
end
s = lock(t.lock)
iterate(t, (gc_token,))
end
function iterate(t::WeakKeyDict{K,V}, state) where V where K
gc_token = first(state)
y = iterate(t.ht, tail(state)...)
function iterate(t::WeakKeyDict{K,V}, state...) where {K, V}
y = lock(() -> iterate(t.ht, state...), t)
y === nothing && return nothing
wkv, i = y
wkv, newstate = y
kv = Pair{K,V}(wkv[1].value::K, wkv[2])
return (kv, (gc_token, i))
return (kv, newstate)
end

filter!(f, d::WeakKeyDict) = filter_in_one_pass!(f, d)