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Subject: Re: [boost] [threadpool] relation with TR2 proposal
From: Anthony Williams (anthony.ajw_at_[hidden])
Date: 2008-09-29 03:37:21

k-oli_at_[hidden] writes:

> Am Montag, 29. September 2008 08:52:52 schrieb Anthony Williams:
>> joaquin_at_[hidden] writes:
>> > Anthony Williams escribió:
>> >> Yes. The intention was that the free function launch_in_pool would use
>> >> an implementation-provided global thread pool that would be as smart
>> >> as the library implementor could manage.
>> >>
>> >> e.g. I have a working prototype for Windows that initially runs one
>> >> pool thread per CPU. If a pool thread blocks on a future for a pool
>> >> task it suspends the current task and runs a new task from the pool.
>> >
>> > How do you do that? By re-executing the blocking task or using fibers?
>> I did just execute the new task on the same stack as the existing
>> task, but was mindful of the stack overflow problem that Johan
>> mentioned earlier. I've now changed my prototype to use fibers to
>> switch stacks. It's not perfect, as the nested task still has the same
>> thread ID as another currently-executing (but suspended) task. I'm
>> looking into ways to handle this, but it would really mean tying
>> *everything* to the thread pool implementation.
>> Like I said, it's a prototype.
>> Anthony
> AFAIK the coroutine library in the vault does also stack switching.
> Are fibers/stack switching supported by other platforms (HP/UX, MacOS etc.)?

I haven't looked into it yet, so I don't know.


Anthony Williams            | Just Software Solutions Ltd
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