STINNER Victor <vstin...@python.org> added the comment:
> Change CPython to call abort() instead of pthread_exit() as that situation is
> unresolvable and the process dying is better than hanging, partially alive.
> That solution isn't friendly, but is better than being silent and allowing
> deadlock. A failing process is always better than a hung process, especially
> a partially hung process.
The last time someone proposed to always call abort(), I proposed to add a hook
instead: I added sys.unraisablehook. See bpo-36829.
If we adopt this option, it can be a callback in C, something like:
Py_SetThreadExitCallback(func) which would call func() rather than
pthread_exit() in ceval.c.
--
Another option would be to add an option to disable daemon thread.
concurrent.futures has been modified to no longer use daemon threads: bpo-39812.
It is really hard to write a reliable implementation of daemon threads with
Python subintepreters. See bpo-40234 "[subinterpreters] Disallow daemon threads
in subinterpreters optionally".
There is already a private flag for that in subinterpreters to disallow
spawning processes or threads: an "isolated" subintepreter. Example with
_thread.start_new_thread():
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->config._isolated_interpreter) {
PyErr_SetString(PyExc_RuntimeError,
"thread is not supported for isolated subinterpreters");
return NULL;
}
Or os.fork():
if (interp->config._isolated_interpreter) {
PyErr_SetString(PyExc_RuntimeError,
"fork not supported for isolated subinterpreters");
return NULL;
}
See also my article on fixing crashes with daemon threads:
* https://vstinner.github.io/gil-bugfixes-daemon-threads-python39.html
* https://vstinner.github.io/daemon-threads-python-finalization-python32.html
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