Add mutexes for thread safe use of TBaseClass

[wmtan]

In ROOT 5, the use of TBaseClass is not thread safe. This pull request, issued at the request of Chris Jones,
adds mutexes for CINT around the uses of TBaseClass, except for those in Fireworks, since Fireworks need not be thread safe.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_1_X.

Add mutexes for thread safe use of TBaseClass

It involves the following packages:

CommonTools/Utils
FWCore/Utilities

@nclopezo, @monttj, @cmsbuild, @Dr15Jones, @StoyanStoynev, @slava77, @vadler, @Degano, @ktf can you please review it and eventually sign? Thanks.
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.
@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[Dr15Jones]

+1
Bug fix to avoid deadlocks

[cmsbuild]

Pull request #4092 was updated. @nclopezo, @monttj, @cmsbuild, @StoyanStoynev, @slava77, @vadler, @Degano can you please check and sign again.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4092/1648/summary.html

[slava77]

Comparison with the baseline Still running...

[slava77]

+1

for #4092 eb9911e

jenkins tests completed, should be a good enough indication nothing is wrong

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4092/1648/summary.html

[slava77]

do we give up on this or is it needed for 71X still?

[Dr15Jones]

this is still needed

[slava77]

@vadler @monttj
please sign this if you don't have any concerns

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?