Review Request 125220: KService: use a real global static for QThreadStorage rather than Q_GLOBAL_STATIC.

[David Faure]

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https://git.reviewboard.kde.org/r/125220/
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Review request for KDE Frameworks and Thiago Macieira.


Repository: kservice


Description
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Creating QThreadStorage on demand leads to race conditions because the
id of the storagedata gets assigned once multiple threads are running,
and read from other threads without locking. I almost submitted a fix for
Qt when I realized the indirection I had here was unnecessary and wrong.

QThreadStorage must be created in the main thread, before any thread is running.


Diffs
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  src/services/kservicetypefactory.cpp 62fd230b4f7a6558c707d257796c5967f39c3607 
  src/services/kservicegroupfactory.cpp 08e0bdcd765ab08afdb71cabc640fd21a73f4218 
  src/services/kservicefactory.cpp 9b0e0c199818fea774c08a4f8fab5aca417927c8 
  src/services/kmimetypefactory.cpp ba07aa0bc9b5d528454cf426b1feadb049402123 

Diff: https://git.reviewboard.kde.org/r/125220/diff/


Testing
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helgrind ksycocathreadtest no longer complains about a race on QThreadStorageData::id


Thanks,

David Faure

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