Tom Tromey wrote:
>>>>>>"Patrick" == Patrick Doyle <[EMAIL PROTECTED]> writes:
>>>>>>
>
>Patrick> What's the easiest way to implement this? Does ThreadGroup
>Patrick> provide enough functionality to do it? Or do I have to
>Patrick> maintain a list of active threads myself? Does Classpath
>Patrick> have any additional functionality to support this?
>
>In libgcj we have a master thread which simply waits on a condition
>variable. When a new thread is started, an active thread count is
>incremented. When a thread dies, the count is decremented and the
>master thread is notified. If it finds that the count is zero, the VM
>shuts down.
>
An alternate technique would be to simply have each non-daemon check the
counter as it exits. If its 0 (after decrementing for itself) then call
Runtime.exit().
Recently in libgcj we made the "master" thread actually the "main"
thread as well - first it runs main() then it sits waiting for other
non-daemons to exit. See _Jv_RunMain() in libjava/prims.cc.
> In our implementation ThreadGroup doesn't enter the
>picture.
>
There is a special case where we want to exit the runtime with an error
status if a thread threw an uncaught exception. We look at
threadgroup.had_uncaught_exception to determine that.
regards
Bryce.
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