What, weird edge cases involving *signals?* Never! :) Here's a nice simple one: it takes at least a few opcodes to set said global flag, during which (depending on the whims of how eval_break gets set) yet another signal might get raised and handled.
I did just make a post to python-ideas about the possibility of adding a "sys.suppress_signals" method; it seems like it would be surprisingly easy in CPython (basically by just adding another check at the start of _PyErr_CheckSignalsTstate) but would also be a truly impressive footgun. Not sure if I'm going to try to climb that particular mountain yet, but I figured I'd see what obvious holes other people could poke in it. Thanks for your help! On Thu, Jun 25, 2020 at 1:27 PM Antoine Pitrou <solip...@pitrou.net> wrote: > On Thu, 25 Jun 2020 11:18:13 -0700 > Yonatan Zunger via Python-Dev <python-dev@python.org> wrote: > > Also, just to sanity-check that I understand things correctly: Python > > signal handlers *are* reentrant, in that a signal handler can be > > interrupted by another signal, is that right? Is there any general > > recommendation on how to write signal handlers in order to manage that? > > To be honest, I've never thought about that. If you need to care about > reentrancy, you should perhaps use some kind of global flag to detect > it (hopefully you won't run into weird edge cases...). > > > (Antoine, I *so* wish I could be doing less with signals and signal > > handlers right now. Alas, I have a combination of a SIGTERM-happy runtime > > environment and a long-story situation involving wacky multiprocessing to > > avoid issues in someone else's C library that make that impossible. So > > instead I'm trying to write a general library to help simplify the task, > > and so thinking about a lot of slightly nutty corner cases...) > > Ha, I wisk you good luck with that :-) > > Best regards > > Antoine. > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/KBD7XG5QPRQRP52FVPAFLZ3G6PSPPVYE/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Yonatan Zunger Distinguished Engineer and Chief Ethics Officer He / Him zun...@humu.com 100 View St, Suite 101 Mountain View, CA 94041 Humu.com <https://www.humu.com> · LinkedIn <https://www.linkedin.com/company/humuhq> · Twitter <https://twitter.com/humuinc>
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