Re: boost::thread IDs

From: Mark Sizer (yg-boost-users_at_[hidden])
Date: 2003-05-13 09:51:40

Thanks for the idea. I may end up going this route (because it's more 
like the current code), but I think the thread_specific_ptr<> is the 
"right" choice.

- Mark

Sam Partington wrote:

> William E. Kempf wrote:
> 
>>Actually, we can, and do in the thread_dev branch.  It means that the
>>ID is of implementation defined type, but it's portable.
>>
> 
> In the mean time I would probably do something like the following:
> (obviously it needs a bit of fleshing out)
> 
> template<class T> class thread_map
> {
>  class wrapper;
> public:
>  typedef const wrapper* id;
> 
>  id create(const boost::function1<void, id> &f, const T& data)
>  {
>   boost::mutex::scoped_lock   lock(m);
>   threads.push_back(boost::shared_ptr<wrapper>(new wrapper(f)));
>   return ids.insert(std::make_pair(threads.back().get(),
> data)).first->first;
>  }
> 
>  T& operator[](id x)
>  {
>   boost::mutex::scoped_lock lock(m);
>   std::map<id, T>::iterator i(ids.find(x));
>   if (i == ids.end())
>    throw std::out_of_range("Thread ID does not exist");
>   return i->second;
>  }
> 
> private:
>  class wrapper : boost::noncopyable
>  {
>   boost::thread t;
>  public:
>   explicit wrapper(boost::function1<void, id> f)
>    : t(boost::bind<void>(f, this))
>   {}
>  };
>  boost::mutex        m;
>  std::map<id, T>        ids;
>  std::vector<boost::shared_ptr<wrapper> > threads;
> };
> 
> void mythread(thread_map<int>::id id) { /* do something */ }
> 
> void f()
> {
>  thread_map<int>   threads;
>  thread_map<int>::id  id(threads.create(&mythread, 42));
>  DEBUG_ASSERT(threads[id] == 42);
> }
> 
> 
> 
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