Re: [boost] Re: thread::current() ?

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2003-06-28 22:29:02

On Saturday, June 28, 2003, at 06:32  PM, Philippe A. Bouchard wrote:

> Thanks... but is it possible to obtain the initial address of the 
> functor
> object portably, given the current thread object?

To the best of my knowledge, no.  As currently designed the thread 
constructor is not required to record (remember) the starting function.

Such a requirement could impose constraints on the implementation that 
would prohibit desirable optimizations, so we should not add this 
without sufficient motivation.  Specifically, with the current 
interface it is possible to implement the thread(f) constructor such 
that it does not need to access the heap if the type of f is a simple 
function pointer.  However, if the thread is required to store f, then 
I suspect such an optimization would no longer be practical.

Just shooting from the hip, one might be able to build a 
hash_map<thread, function<void()> > (<cough> excuse me, that's 
unordered_map<thread, fucntion<void()> >) to achieve such functionality 
if desired.  However, I haven't actually prototyped that idea, so I 
can't swear it would work at this point.

-Howard