[PD-dev] Thread concurrency issue

[Pierre Guillot]

I encountered a bad thread concurrency issue using PD in a multi
instance/multi thread context. The behavior of the increment and decrement
of the static variable *stackcount* is undefined and results mostly in
stack overflow. The simplest solution seems to set the variable a TLS with
PERTHREAD. Here is a PR that solves the issue:
https://github.com/pure-data/pure-data/pull/288.

Cheers,
Pierre
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