Modified signal handler to avoid async-unsafe functions#96
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This patch reimplemented signal handling in CMSSW. It avoids async-unsafe functions in signal handler.
For reference, see the link https://github.com/bbockelm/cmssw/blob/stacktrace_handler_revisit/FWCore/Services/src/InitRootHandlers.cc
I tried this patch with some simple multi-thread test cases and it worked fine. Is there any complicated test cases I can run? I think this patch is not very ready to merge, but it achieved basic functions. Any criticisms are welcome.