cubicweb #3403678 dump thread stacks on SIGQUIT [open]

A nice debugging helper found in OpenERP from a stack exchange recipe. Code is available in the dumpstack signal handler at

What it does is display the stack trace of all threads in the server when a QUIT signal is received. An easy way of generating such a signal on Linux is to hit Ctrl+4 or Ctrl+in the terminal running the server (when running in debug mode).

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