Re: [Boost-users] [boost::thread] interrupt a future get boost::unknown_exception

Subject: Re: [Boost-users] [boost::thread] interrupt a future get boost::unknown_exception
From: Viatcheslav.Sysoltsev_at_[hidden]
Date: 2011-03-21 12:54:25

On Mon, 21 Mar 2011 17:37:20 +0100, <Viatcheslav.Sysoltsev_at_[hidden]>  
wrote:

> On Mon, 21 Mar 2011 02:27:17 +0100, 乔志强  
> <qiaozhiqiang_at_[hidden]> wrote:
>
>> It is only boost::thread
>>
>> int foo()
>> {
>> 	this_thread::sleep(seconds(1000));
>> 	return 0;
>> }
>>
>>
>> int main(int argc, char** argv)
>> {
>> 	boost::packaged_task<int> pt(&foo);
>>
>> 	boost::unique_future<int> fi = pt.get_future();
>>    ..........................
>>
>
> The problem is reproducible with gcc 4.4.5 and boost 1.46.1 on ubuntu  
> x86 linux. I'd classify the issue as a boost bug and submit it into  
> tracker unless somebody from boost::future knowers clarify the situation.
>
> -- Slava
>

Just to clarify what I've got from little debugging session: the user task  
is wrapped in try catch(...) clause, so when the future job throws, the  
author's idea was likely to save the exception to simulate kind of rethrow  
in future.get(). Unfortunately I do not know a mean to save an exception  
in general, so seems the author stumbled upon it too, and currently the  
exception being thrown in future is lost and general unknown_exception is  
reported with get().

-- Slava