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Add an "assert mode" to -X showrefcount that fails when references leak #94755
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There is an existing test for 0 leaked refcounts: test_embed.test_no_memleak.
It currently only ensures that leaks do not occur within just an init/fini cycle.
I'm not sure if such feature would be useful today, since there are still many Python stdlib extensions which leak memory at exit :-(
- Convert static types to heap types: use PyType_FromSpec() #84258
- Clear static types in Py_Finalize() for embedded Python #90575 (comment)
Well, at least last time I checked. Maybe things went better since I checked.
Well, there are some extensions/tests that don't leak memory, and the option could be used to ensure those don't start leaking.
The
-X showrefcountoption currently prints the number of references at exit.Once we get the number to 0, we should test that it stays that way. It would be nice to add a mode, say
-X showrefcount=assert0or-X checkrefcount, that exits with nonzero if refs/blocks remain. Then it can be used in subprocess tests.cc @vstinner