QGIS "not responding"

[qgib]

Author Name: Jonathan Moules (Jonathan Moules)
Original Redmine Issue: 8476
Affected QGIS version: master

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A common theme I'm noticing is that any time QGIS starts doing something, if I then try and close that dialog, QGIS will "crash" (as in, bring up the "QGIS is not responding" windows dialog). This seems to be 100% repeatable.

Examples:

• Connecting to Oracle with wrong credentials - while it times out if I click the "x" on the dialog - crash.
• Close attribute table while it is saving changes - crash.
• Join attributes by location - press the "x" while it is processing - Crash.

The crash isn't actually a crash, it is basically the fact that QGIS stops responding and Windows thinks it has crashed (which is basically the same thing if you click "close the program).

Windows 7, x64, d61cb25

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• Clipboard01.png (Jonathan Moules)

[qgib]

Author Name: Nathan Woodrow (@NathanW2)

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This is simply because we don't use threads in a lot of the code so the UI gets blocked while we are waiting on something long.

[qgib]

Author Name: Jonathan Moules (Jonathan Moules)

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It makes QGIS seem really really unstable. It threw me for a while; less technical users won't get the distinction between "not responding" and "crash".

[qgib]

Author Name: Nathan Woodrow (@NathanW2)

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Of course. It's common problem with a lot of applications. Threading can sometimes take a little bit to get right which is why most people don't go for it right way when working on a problem. Lucky Qt takes away a bit of that pain.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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IIRC if an application doesn't seem to react to the close request, Windows offers to kill it or just let it continue. So it's not an crash, but the user chose to kill it. Anyway, the multithreaded rending should help with this - although there might be still stuff, that blocks the whole process and takes time to complete. If you run into those please file individual tickets (so those can eventually been moved to threads too).

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• status_id was changed from Open to Closed