The implementation of the ThreadIdentifier abstraction (in wtf/
ThreadingPthreads.cpp) is pretty inefficient. This makes calls like
WTF::currentThread() a lot slower than you'd expect — that call is
showing up as a hot spot in Chromium's JS/DOM bindings, believe it or
not.
I filed a bug on this: https://bugs.webkit.org/show_bug.cgi?id=30922
My first suggestion is just to typedef ThreadIdentifier to pthread_t
(if pthreads are in use) and avoid the need for a mapping altogether.
Any reason this wouldn't be a good idea? (If not, I have two other
suggestions in the bug report.)
—Jens
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