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Do not iterate over hash which might conflict with new pair addition #884

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Sep 21, 2020
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Do not iterate over hash which might conflict with new pair addition #884

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5 changes: 4 additions & 1 deletion lib/concurrent-ruby/concurrent/atomic/ruby_thread_local_var.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,10 @@ def self.thread_local_finalizer(index)
# The cost of GC'ing a TLV is linear in the number of threads using TLVs
# But that is natural! More threads means more storage is used per TLV
# So naturally more CPU time is required to free more storage
THREAD_LOCAL_ARRAYS.each_value { |array| array[index] = nil }
#
# DO NOT use each_value which might conflict with new pair assignment
# into the hash in #value= method
THREAD_LOCAL_ARRAYS.values.each { |array| array[index] = nil }
# free index has to be published after the arrays are cleared
FREE.push(index)
end
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