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OK. Please explain. Looking at tstate assignment
In posixmodule.c:PyOSAfterFork_Child()
 PyStatus status;
 _PyRuntimeState *runtime = &_PyRuntime;
...
 PyThreadState *tstate = _PyThreadState_GET();
and later calls
 status = _PyRuntimeState_ReInitThreads(runtime);
Yet in Posix/ceval.c
PyStatus
_PyEval_ReInitThreads(PyThreadState *tstate)
{
 _PyRuntimeState *runtime = tstate->interp->runtime;
** this looks like runtime->interp->runtime
And then we get down to:
 /* Destroy all threads except the current one */
 _PyThreadState_DeleteExcept(runtime, tstate);
Is this correct - as it looks like:
_PyThreadState_DeleteExcept(runtime->interp->runtime, runtime) -- where runtime == &_PyRuntime;