having trouble with thread subclasses

[Graydon Hoare]

Hi. I'm using glibc/linux 2.0 and g++2.8.0
I've subclassed from omni_thread and _sk_widget in widget_impl. When I
construct widget_impl, tell it obj_is_ready, and then call widget->start()
(to start it's internal thread) I immediately get

object.cc:738: omniObject::~omniObject(): Assertion `0' failed.

which sends a SIGABRT and the program dies.
any ideas why omni_thread::start() would decide to deconstruct my object?

-graydon

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