Review Request: Use mutex to avoid calling KWallet::openWallet several times

[Daniele Elmo Domenichelli]

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http://git.reviewboard.kde.org/r/107426/
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Review request for Telepathy and David Edmundson.


Description
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In order to avoid the problem when kwallet is closed while kcm accounts is open, we introduced a bug: if more than one openWallet call is done at the same time, we reset the scoped pointer with a new wallet, the old wallet is deleted and therefore the signal is never emitted.
This patch uses a QMutex to avoid trying the wallet several times if it is already being opened.
In order to catch the signal from the KWallet, I needed a QObject, and since the KTp::WalletInterface is using K_GLOBAL_STATIC, I used the private class instead.


This addresses bug 310505.
    http://bugs.kde.org/show_bug.cgi?id=310505


Diffs
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  KTp/wallet-interface.cpp 428c02e48365c09fb579a26a73ec01efac029864 

Diff: http://git.reviewboard.kde.org/r/107426/diff/


Testing
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Disconnected all accounts, closed the wallet and reconnected all accounts several times (accepting and canceling the kwallet dialog)

Tried to randomly connect/disconnect accounts from kcm while randomly close kwallet and accepting/cancelling kwallet dialog.


Thanks,

Daniele Elmo Domenichelli

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