[Bug libc/6399] gettid() should have a wrapper

[mtk.manpages at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=6399

--- Comment #10 from Michael Kerrisk <mtk.manpages at gmail dot com> 2013-02-08 23:25:45 UTC ---
> I'd argue that this should not be a syscall wrapper.  The libc 
> can get this information out of the TLS segment _very_ quickly.

Given the unpleasant consequences that have resulted from PID caching for
getpid(), I'm sceptical that this is a good idea. At the very least, I wonder
if there is some subtle consequence that will bite us later.

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