I need a big chunk of temporary working memory for each resident thread

[Robert_Crovella]

a possibly similar question was discussed here In the response I provided, the links to SO topics discuss one possible method to avoid the hazard you mention:

@driprock

I understand that this is a bad idea, since the order that the threads begin and end is not strictly guaranteed, so in principle two active threads might get the same index and corrupt each other’s part of the buffer.