Graphics.close_graph crashes 64-bit Windows ports #678
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At the moment, this implementation won't release two separate threads both blocking on |
MPR3963 incorrectly fixed in 4.01.0. Closing the graphics window will now cause calls to Graphics.wait_next_event to terminate (which was the original MPR) and calling Graphics.close_graph no longer crashes the 64-bit runtime.
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(updated Changes file) |
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Thanks for finding and fixing this bug! |
damiendoligez
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Jul 20, 2016
Graphics.close_graph crashes 64-bit Windows ports
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Rebased and merged into trunk. |
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No worries - could the fix go in 4.03 too? |
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I don't think any bugfix release in planned on 4.03. |
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Ah, fair enough! |
camlspotter
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Oct 17, 2017
Graphics.close_graph crashes 64-bit Windows ports
stedolan
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Sep 21, 2022
* Rebase * ocamlformat * Disable CFG tests. * Restore ocamlcfg tests. * Prologue * Revert dataflow changes. * Revert dataflow changes. * Format * Use the dedicated flag. * Review * Review * CRs * Review * ocamlformat * Arm64 * Review * Review * Review * Review * ocamlformat * Fix review change * Debugging tweaks. * ocamlformat * Review. * ocamlformat Co-authored-by: Greta Yorsh <gyorsh@janestreet.com>
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A fix for MPR3963 was added in b147d07 (released in 4.01.0) by @damiendoligez. As far as I can see, this fix never worked: I think it's fundamentally broken and on the 32-bit Windows ports it doesn't work and on the 64-bit Windows ports, it causes
Graphics.close_graphto bring down the runtime.I believe the original intention was that closing the graphics window (via the X button) should result in any calls to
Graphics.wait_next_eventterminating with:but this is done by causing WM_DESTROY to raise an OCaml exception - but the window handler is in a non-OCaml thread, so it cannot possibly raise OCaml exceptions?