Re: [boost] [thread] get_id

Subject: Re: [boost] [thread] get_id
From: Ingo Loehken (Ingo.Loehken_at_[hidden])
Date: 2010-11-18 13:13:24

Hi,

does anyone know, why boost::this_thread::get_id() is about 60 times 
slower than PR_GetCurrentThread().

boost version : 1.42
platform and os : 32bit, win xp sp3
compiler : msvc8
lib : boost_thread-vc80-mt-p-1_42.dll

measured : 10 million executions of PR_GetCurrentThread and 
boost::this_thread::get_id(), where the latter
took 1.5s and the previous only 75ms. Both measures with high performance 
counter from outside the loop
and assignment to vector, to avoid optimizations by compiler.

What makes this so ridiculous, is that boost::thread_specific_ptr 
performans quite well, as fast like
PR_GetCurrentThread. Do I ignore some implementation or optimization 
intrinsics ?

Greetz, Ingo.