Shared tds.hash gives sigsegv

[octavian-ganea]

I am trying to figure out the proper way to update a shared tds.hash by multiple threads concurrently. The following code inspired after test-threads-shared.lua gives 'Segmentation fault (double free or corruption)' every time I run it:

function f()
  local threads = require 'threads'
  threads.Threads.serialization('threads.sharedserialize')
  local njob = 10
  local tds = require 'tds'
  local dict = tds.Hash()
  collectgarbage()
  collectgarbage()

  local pool = threads.Threads(
    10,
    function(threadIdx)
    end
  )

  for k=1,njob do
    pool:addjob(
      function()
        for i = 1,100000 do
          dict[i * 11 + k] = math.random()
        end
        collectgarbage()
        collectgarbage()
        return __threadid
      end,
      function(id)
      end
    )
  end

  for k=1,njob do
    pool:addjob(
      function()
        collectgarbage()
        collectgarbage()
      end
    )
  end
  pool:synchronize()
  pool:terminate()
  return dict
end

a = f()
print(a[1])

Any ideas if the problem is on my side ? Thanks.

[colesbury]

I don't think tds.hash is thread-safe for multiple writers