Review Request: fix callback race in the session saving and shutdown code

[Commit Hook]

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This review has been submitted with commit 3af3f4c9c5bef5a3297ab50bcd445063b7441680 by Raphael Kubo da Costa to branch KDE/4.9.

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On May 31, 2012, 8:48 a.m., Andriy Gapon wrote:
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> (Updated May 31, 2012, 8:48 a.m.)
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> Review request for Plasma.
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> Description
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> This patch tries to a fix a race in the session saving and shutdown code of ksmserver.
> The race may happen on wmPhase1WaitingCount variable when WM-type clients are fast enough to complete their save requests while the loop in KSMServer::shutdown is still iterating.  As a result wmPhase1WaitingCount may become zero too early and that would kick off the next save/shutdown phase in a client's callback.  In fact, it might even go multiple times from zero to non-zero and back during the WM-specific loop.
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> This addresses bug 206511.
>     http://bugs.kde.org/show_bug.cgi?id=206511
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> Diffs
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>   ksmserver/shutdown.cpp a5a1ef9 
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> Diff: http://git.reviewboard.kde.org/r/105111/diff/
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> Testing
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> Thanks,
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> Andriy Gapon
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