Subject: Re: [boost] [thread] thread_specific_ptr performance
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2010-01-11 14:12:38
On 01/11/2010 05:22 PM, Stefan Strasser wrote:
> even though I understand the need for it now, it still seems odd
> that we use a std::map to simply access a value in another memory segment.
>
> have you thought about dynamically allocating an index into a
> (thread-specific) vector instead of a key based on the thread_specific_ptr's
> address?
> IIUC that would allow constant-time access in all cases.
Yes, that's what I did in my patch in ticket #2361. One inconvenience
with that approach is to restrain the size of the vector if
thread_specific_ptrs are constantly created/destroyed. I did not solve
it in my patch but it should be quite doable.
I really hope Anthony will take a look at it and come up with a
vector-based solution. Or I can finish the patch myself, if it has any
chance of getting into SVN. Anthony?