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# File 'lib/better_auth/async.rb', line 7
def map_concurrent(items, concurrency:, &mapper)
list = items.to_a
return [] if list.empty?
width = normalized_concurrency(concurrency, list.length)
results = Array.new(list.length)
next_index = 0
first_error = nil
mutex = Mutex.new
status = Queue.new
workers = Array.new(width) do
Thread.new do
loop do
index = mutex.synchronize do
break if first_error || next_index >= list.length
current = next_index
next_index += 1
current
end
break unless index
begin
results[index] = mapper.call(list[index], index)
rescue => error
mutex.synchronize { first_error ||= error }
status << [:error, error]
break
end
end
ensure
status << [:done, nil]
end
end
done = 0
while done < workers.length
type, error = status.pop
if type == :error
workers.each { |worker| worker.kill if worker.alive? }
workers.each(&:join)
raise error
end
done += 1
end
raise first_error if first_error
results
end
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