Thread-safety for hashes in Ruby

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0

I'm curious about thread safety for hashes in Ruby. Running the following from the console (Ruby 2.0.0-p247):

h = {}
10.times { Thread.start { 100000.times {h[0] ||= 0; h[0] += 1;} } }

returns

{0=>1000000}

which is the correct expected value.

Why does it work? Can I rely on hashes being thread-safe with this version of Ruby?

asked 1 min ago

Nicolas M.

172