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gh-105716: Support Background Threads in Subinterpreters Consistently (gh-109921)

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The existence of background threads running on a subinterpreter was preventing interpreters from getting properly destroyed, as well as impacting the ability to run the interpreter again. It also affected how we wait for non-daemon threads to finish.

We add PyInterpreterState.threads.main, with some internal C-API functions.
This commit is contained in:
Eric Snow 2023-10-02 14:12:12 -06:00 • committed by GitHub
parent a040a32ea2
commit 1dd9dee45d
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11 changed files with 258 additions and 46 deletions
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4
Lib/threading.py
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@ -38,6 +38,7 @@ _daemon_threads_allowed = _thread.daemon_threads_allowed
_allocate_lock = _thread.allocate_lock
_set_sentinel = _thread._set_sentinel
get_ident = _thread.get_ident
_is_main_interpreter = _thread._is_main_interpreter
try:
get_native_id = _thread.get_native_id
_HAVE_THREAD_NATIVE_ID = True
@ -1574,7 +1575,7 @@ def _shutdown():
# the main thread's tstate_lock - that won't happen until the interpreter
# is nearly dead. So we release it here. Note that just calling _stop()
# isn't enough: other threads may already be waiting on _tstate_lock.
if _main_thread._is_stopped:
if _main_thread._is_stopped and _is_main_interpreter():
# _shutdown() was already called
return
@ -1627,6 +1628,7 @@ def main_thread():
In normal conditions, the main thread is the thread from which the
Python interpreter was started.
"""
# XXX Figure this out for subinterpreters. (See gh-75698.)
return _main_thread
# get thread-local implementation, either from the thread