New submission from STINNER Victor <[email protected]>:
Programs/_testembed.c contains the following test used by test_embed:
static int test_audit_subinterpreter(void)
{
Py_IgnoreEnvironmentFlag = 0;
PySys_AddAuditHook(_audit_subinterpreter_hook, NULL);
_testembed_Py_Initialize();
Py_NewInterpreter();
Py_NewInterpreter();
Py_NewInterpreter();
Py_Finalize();
switch (_audit_subinterpreter_interpreter_count) {
case 3: return 0;
case 0: return -1;
default: return _audit_subinterpreter_interpreter_count;
}
}
When Py_Finalize() is called, the current interpreter is a subinterpreter (the
3rd interpreter), not the main interpreter.
* Is it correct to call Py_Finalize() in such case?
* Is Python supposed to magically destroy the 3 interpreters?
In bpo-38858, I'm trying to reuse the same code to initialize and finalize the
"main" interpreter and subinterpreters. I had an issue with
test_audit_subinterpreter() when working on the PR 17293.
I modified my PR 17293 to not expect that Py_Finalize() can only be called from
the main interpreter, but actually check if the current interpreter is the main
interpreter or not. It fix test_audit_subinterpreter() but again, I'm not sure
what is the correct behavior?
--
Last year, we had a similar discussion about calling Py_Main() *after*
Py_Initialize(). I hacked the code to make it possible because it was supported
previously, even if the Py_Main() configuration is only partially applied. But
I understood that Nick Coghlan would prefer to deprecate supporting to call
Py_Initialize() before Py_Main().
PEP 587 added Py_RunMain() which provides a different solution to this problem:
https://docs.python.org/dev/c-api/init_config.html#c.Py_RunMain
----------
components: Interpreter Core
messages: 357080
nosy: eric.snow, nanjekyejoannah, ncoghlan, vstinner
priority: normal
severity: normal
status: open
title: Can Py_Finalize() be called if the current interpreter is not the main
interpreter?
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue38865>
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