Make statics atomic in TrackingTools/GsfTools

[wmtan]

For thread safety, make statics atomic.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_0_X.

Make statics atomic in TrackingTools/GsfTools

It involves the following packages:

TrackingTools/GsfTools

@nclopezo, @thspeer, @slava77 can you please review it and eventually sign? Thanks.
@gpetruc, @cerati, @GiacomoSguazzoni, @rovere this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@ktf you are the release manager for this.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/1221/summary.html

[slava77]

+1

tested in CMSSW_7_0_X_2013-11-05-1400 as sign269
in a combination of

• Made Conversion thread-safe and smaller in memory and storage
  • Made Conversion thread-safe and smaller in memory and storage #1305 f9d153c
• Thread safe DataFormats/DTRecHit
  • Thread safe DataFormats/DTRecHit #1304 a8b3dd3
• Make statics atomic in TrackingTools/GsfTools
  • Make statics atomic in TrackingTools/GsfTools #1319 021f6b9
• Make statics thread local in TrackingTools/TrajectoryFiltering
  • Make statics thread local in TrackingTools/TrajectoryFiltering #1321 079057f
• Change to const static in MuonDigiCollection
  • Change to const static in MuonDigiCollection #1328 80b3892
• freeTrajectoryState() should return const pointer
  • freeTrajectoryState() should return const pointer #1331 fb7473b
• Fix thread safety issues by removing mutable data members of MuonDetIdAssociator
  • Fix thread safety issues by removing mutable data members of MuonDetIdAssociator  #1347 3dfc4e3
• Fix some thread safety issues in TrackingTools/GeomPropagators
  • Fix some thread safety issues in TrackingTools/GeomPropagators #1348 8332c7e

all merge, compile, and run OK and there are no differences in outputs, as expected

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IBs unless changes or unless it breaks tests. @ktf can you please take care of it?