Review Request 128762: qmljs: restructure duchain locking to prevent deadlocks

[Kevin Funk]

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@scummos: What about this one?

- Kevin Funk


On Sept. 5, 2016, 9:44 p.m., Sven Brauch wrote:
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> https://git.reviewboard.kde.org/r/128762/
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> (Updated Sept. 5, 2016, 9:44 p.m.)
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> Review request for KDevelop and Kevin Funk.
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> Bugs: 367825
>     http://bugs.kde.org/show_bug.cgi?id=367825
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> Repository: kdevelop
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> Description
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> We _must not_ hold a duchain lock when contextOfFile() is called. That
> might try to add something to the background parser queue, which locks
> the background parser mutex; then both locks are held, which causes
> deadlocks.
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> Diffs
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>   languages/qmljs/codecompletion/context.cpp 3a44f45 
>   languages/qmljs/codecompletion/tests/test_qmljscompletion.cpp b689418 
>   languages/qmljs/duchain/declarationbuilder.cpp fb0cb5d 
>   languages/qmljs/duchain/expressionvisitor.cpp 3b641f5 
>   languages/qmljs/duchain/helper.cpp e537103 
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> Diff: https://git.reviewboard.kde.org/r/128762/diff/
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> Testing
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> Opened some test project, no crashes, no freezes, and the (I think) reason for the freeze is gone.
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> Thanks,
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> Sven Brauch
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>

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