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?