Message 403716 - Python tracker

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Author	pitrou
Recipients	docs@python, graingert, jeff.allen, pablogsal, pitrou, serhiy.storchaka, steven.daprano
Date	2021-10-12.08:35:49
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1634027749.77.0.656059935614.issue45435@roundup.psfhosted.org>
In-reply-to

Content
I'm also surprised to learn that `L.sort()` and `D1.update(D2)` are supposed to be atomic. They certainly are not in the general case. Remember, any Python code can release the GIL (because the GIL is released periodically in the interpreter loop). Any DECREF can also release the GIL (because it may trigger the execution of arbitrary destructors). This restricts a lot which operations can be safely considered atomic.

I'm also surprised to learn that `L.sort()` and `D1.update(D2)` are supposed to be atomic. They certainly are not in the general case.

Remember, any Python code can release the GIL (because the GIL is released periodically in the interpreter loop). Any DECREF can also release the GIL (because it may trigger the execution of arbitrary destructors). This restricts a lot which operations can be safely considered atomic.

History
Date	User	Action	Args
2021-10-12 08:35:49	pitrou	set	recipients: + pitrou, steven.daprano, docs@python, serhiy.storchaka, jeff.allen, graingert, pablogsal
2021-10-12 08:35:49	pitrou	set	messageid: <1634027749.77.0.656059935614.issue45435@roundup.psfhosted.org>
2021-10-12 08:35:49	pitrou	link	issue45435 messages
2021-10-12 08:35:49	pitrou	create