Commits on Jul 28, 2015

1. Implement a well-behaved stacktrace printer. …

   This implements a stack trace printer which is safe to call
   from a signal handler (ROOT's stack trace printer is not async-signal
   safe; see 'man 7 signal' for more information about async-signal
   safety).
   
   Further, on Linux, this utilizes the clone library call directly;
   clone has the advantage of avoiding the pthread_atfork handlers.
   We have observed that jemalloc currently registers AS-unsafe atfork
   handlers, which would cause a deadlock if we use fork().
   
   (cherry picked from commit cff10d3)

   

   bbockelm committed Jul 28, 2015
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2. Replace use of pstack with direct invocation of gdb. …

   This switches from the system pstack script to using gdb directly.
   Ideally, this will be more usable on non-Linux platforms.
   
   NOTE that this will pull the gdb from the environment (i.e., probably
   CMSSW's gdb instead of the system one).  CMSSW's gdb can parse the
   debug symbols we ship, meaning that the backtrace will include
   niceties like filenames, line numbers, and decode arguments.
   
   The downside of this is that CMSSW's gdb requires 10 minutes
   and about 1GB RAM to generate the traceback.
   
   (cherry picked from commit b6d0bae)

   

   bbockelm committed Jul 28, 2015
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3. Toss exception instead of doing work in an assert. …

   (cherry picked from commit 24c51a4)

   

   bbockelm committed Jul 28, 2015
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