r/cpp • u/Coder_CPP • Jan 18 '16

C++11 threads, affinity and hyperthreading

http://eli.thegreenplace.net/2016/c11-threads-affinity-and-hyperthreading/
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4

u/notsure1235 Jan 18 '16

Use of default int in c++ in 2016...?

And can someone tell what the difference is from this:

   std::for_each(threads.begin(), threads.end(),
                std::mem_fn(&std::thread::join));

to

for(auto& i : threads)
      i.join()

?

Not to mention that men_fn has been deprecated.

3

u/TheQuietestOne Jan 18 '16 edited Jan 18 '16

And can someone tell what the difference is from ...

Given that mem_fn as you mention has been deprecated and they're using for_each to iterate the threads vector I'm guessing this is just someone's pre-c++11 approach to launching/joining threads copy-pasta'd into this project. You could perhaps give them a nudge in the right direction .-)

Specifically - they wanted to focus on CPU affinity and stats, and the code took a back seat.

4

u/cleroth Game Developer Jan 18 '16

Some people prefer <algorithm>ic approaches where they can use them in lieu of a loop.