torture: Check for multiple concurrent torture tests
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Mon, 7 Apr 2014 16:14:11 +0000 (09:14 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Wed, 14 May 2014 16:46:29 +0000 (09:46 -0700)
The torture tests are designed to run in isolation, but do not enforce
this isolation.  This commit therefore checks for concurrent torture
tests, and refuses to start new tests while old tests are running.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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