How to get a thread ID?

[Kostik Belousov]

On Thu, Jun 03, 2010 at 09:44:52AM -0500, Dan Nelson wrote:
> In the last episode (Jun 03), V??clav Haisman said:
> > is it possible to obtain some sort of a thread ID that identifies a thread
> > within a process other than pthread_self()?  Something like gettid() on
> > Linux?  Apparently, on FreeBSD the pthread_t is a pointer type and does
> > not identify the thread well enough.  GDB on FreeBSD seems to know about
> > threads and does not seem to use the same ID as is pthread_t.
> 
> The return value of pthread_self() is a pointer to the (private) "struct
> pthread" for the current thread, and should uniquely identify a thread.  Do
> you have a testcase that shows otherwise?  GDB might just enumerate the
> currently active threads starting from 1.

There is thr_self(2) undocumented syscall:
int thr_self(long *id);
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