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

[Sven Brauch]

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https://git.reviewboard.kde.org/r/128762/
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(Updated Sept. 5, 2016, 9:44 p.m.)


Review request for KDevelop and Kevin Funk.


Bugs: 367825
    http://bugs.kde.org/show_bug.cgi?id=367825


Repository: kdevelop


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.


Diffs (updated)
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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 

Diff: https://git.reviewboard.kde.org/r/128762/diff/


Testing
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Opened some test project, no crashes, no freezes, and the (I think) reason for the freeze is gone.


Thanks,

Sven Brauch

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