[pypy-issue] [issue1597] Tkinter needs a threaded tcl

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

It's not difficult to do, but tedious.
When tcl is not threaded, a lock needs to be acquired/released for all tcl operations. See all the 
"ENTER_TCL" macros in _tkinter.c.
In our implementation, this could be replaced by a "with self._lock_tcl():" block, which would be 
a no-op when tcl is threaded.
At least with cffi we don't have to bother about the GIL (and Py_BEGIN_ALLOW_THREADS and the 
tcl_tstate variable)

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nosy: +amaury

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