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macosx: Clean up single-shot timers correctly#27875
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Works locally for me.
Are we able to clean up some of the timer handling on the Python side as well?
matplotlib/lib/matplotlib/backends/backend_macosx.py
Lines 70 to 72 in0da2da0
| # We need to explicitly stop and remove the timer after | |
| # firing, otherwise segfaults will occur when trying to deallocate | |
| # the singleshot timers. |
This does appear to have resolved the segfault/obj-c level exception I was seeing. However, the test is still flaky for me locally (~half the time it fails as |
Ah, that's unfortunate; I had hoped the timeout was due to having to create the coredump or something similar. |
I think we can drop the |
The `NSTimer` docs state that a non-repeating (aka single-shot in ourterms) timer is invalidated after it fires. This means that we shouldnot do it ourselves, and in fact it appears that the pointer itself isno longer valid, so we would be passing an `invalidate` message to arandom object or segfault.
Yes, you are correct we need that reference somewhere.
The test fails if I don't touch my mouse at all, but succeeds if the mouse enters the canvas area. Might have to do with the event loop not running when the canvas is in the background and needs to be woken up somehow from the signals coming in. |
We are going to do a 3.8.4 due to numpy 2.0 churn so might as well fix a segfault/objective C error risk. |
Less than great for an automated test.... |
I don't think it is quite this clean in my experience... certainly something to it, but I have seen Xpasses happen without moving my mouse and failures when I have moved my mouse into the canvas, though itdoes seem to shift probabilities around... |
…875-on-v3.8.xBackport PR#27875 on branch v3.8.x (macosx: Clean up single-shot timers correctly)
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PR summary
The
NSTimerdocs state that a non-repeating (aka single-shot in our terms) timer is invalidated after if fires. This means that we should not do it ourselves, and in fact it appears that the pointer itself is no longer valid, so we would be passing aninvalidatemessage to a random object or segfault.I believe this is whytest_other_signal_before_sigintis marked as flaky as well, as it uses a single-shot timer and a segfault is recorded in the XPASS log.PR checklist