Synnefo

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def set_signal_trap():

    from os import getpid

    from traceback import format_stack, print_exc

    from signal import signal, SIGTRAP

    from sys import stderr

    import gc

    def greenlet_trace(arg):

        i = 0

        stderr.write("--- Greenlet trace: %s\n" % arg)

        for ob in gc.get_objects():

            if not isinstance(ob, greenlet):

                continue

            if not ob:

                continue

            i = i + 1

            stderr.write(("--- > Greenlet %d:\n" % i +

                          "".join(format_stack(ob.gr_frame)) + "\n\n"))

        stderr.write("--- End of trace: %s\n" % arg)

    try:

        from greenlet import greenlet

    except ImportError:

        def greenlet_trace(arg):

            return

    def handle_trap(*args):

        try:

            import trap_inject

            reload(trap_inject)

            trap_inject.inject()

        except ImportError:

            pass

        except:

            print_exc()

        msg = ('=== pid: %s' % getpid()) + '\n'.join(format_stack()) + '\n'

        stderr.write(msg)

        greenlet_trace('TRAP')

    signal(SIGTRAP, handle_trap)