Re: [boost] [threadpool] new version v12

Subject: Re: [boost] [threadpool] new version v12
From: Anthony Williams (anthony.ajw_at_[hidden])
Date: 2008-11-03 09:34:11

Anthony Williams <anthony.ajw_at_[hidden]> writes:

> "Peter Dimov" <pdimov_at_[hidden]> writes:
>
>> Anthony Williams:
>>> future<T> some_future;
>>>
>>> try
>>> {
>>>    throw my_exception();
>>> }catch(...)
>>> {
>>>    some_future.wait(); // may invoke task from pool if some_future
>>>                        // not ready
>>>    throw; // oops, where's my exception state gone?
>>> }
>>
>> Are you sure that the above doesn't work?
>>
>> try
>> {
>>        throw my_exception();
>> }
>> catch(...)
>> {
>>    try
>>    {
>>        call_function_that_throws();
>>    }
>>    catch( ... )
>>    {
>>    }
>>
>>    throw; // works
>> }
>
> No, I'm not sure, but if some_future.wait() switches to a new fiber I
> am concerned that it won't, because the exception state is per-thread,
> not per-fiber.

And of course if the thread pool migrates *this* task to another
*thread* inside the wait then I'm fairly sure it won't work with MSVC
unless you're on Vista.

Anthony
-- 
Anthony Williams
Author of C++ Concurrency in Action | http://www.manning.com/williams
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