Hi David,
On 10/31/17 08:45, David Holmes wrote:
The docs for TPE cover this in detail: [1]
Finalization
A pool that is no longer referenced in a program AND has no
remaining threads will be shutdown automatically. If you would like
to ensure that unreferenced pools are reclaimed even if users forget
to call shutdown(), then you must arrange that unused threads
eventually die, by setting appropriate keep-alive times, using a
lower bound of zero core threads and/or setting
allowCoreThreadTimeOut(boolean).
I'm trying to understand the purpose of finalize() in TPE, but can't.
I'm surely missing something. If the pool is no longer referenced AND
there are no active threads, what is there left to shutdown()
actually? All that remains is garbage that will eventually be GCed.
Ummmmm .... I'm going to have to do some archaeology here ...
David
I can imagine a thread pool where worker threads, while idling, don't
have a reference to the pool so the pool can shutdown() itself when:
- the pool is no longer referenced AND
- there is no worker thread executing a task (i.e. all worker threads
are idle)
In such state, the pool is not reachable and may be shutdown.
But it seems that TPE is not such a pool.
Regards, Peter
Regards, Peter
David
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[1]
https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ThreadPoolExecutor.html
