Re: [boost] [thread] getting boost::thread* form boost::thread::id

Subject: Re: [boost] [thread] getting boost::thread* form boost::thread::id
From: Vicente Botet Escriba (vicente.botet_at_[hidden])
Date: 2008-11-14 18:14:55

Anthony Williams-4 wrote:
> 
> "vicente.botet" <vicente.botet_at_[hidden]> writes:
> 
> 
>> With the current Boost.Thread interface, I don't see how I can get it
>> either from the current thread or from the thread::id. Can I?
> 
> No, you can't get a pointer or reference to the boost::thread object
> for a thread from its ID. Firstly, there may not be one (e.g. the
> initial thread, or a detached thread), and secondly that would defeat
> the point of the separation. A boost::thread instance is a
> single-ownership object. In general it is not safe to access it from
> multiple threads. On the other hand, boost::thread::id values are just
> values, and can be freely copied around.
> 
> Finally, if you move your thread between boost::thread objects, all
> your pointers would become invalid.
> 
> 

If a boost::thread instance is a single-ownership object, what about
thread::group? Is the ownership of the thread added to a group transfered to
the group? No, I don't think so.

In which cases it is not safe to access it from multiple threads?

Well even if you are right and the thread pointer was not a good idea, as
what I want is to interrupt a thread for which I have a thread::id may be
you can add a static function

    void interrupt(thread::id);

Is this function unsafe?

Vicente

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