pthread2lwp API

[Kamil Rytarowski <n54%gmx.com@localhost>]

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I need to extract lwp (lwpid_t) from arbitrary -- and not the current
one --  POSIX thread (pthread_t). I need to access sysctl(7)
interfaces for lwp and read its properties with a given pthread_t.

In my current use-case is to access l_rtime_sec and l_rtime_usec from
 struct kinfo_lwp.

I don't see a way to do it cleanly, something different than reading
opaque pthread_t pointer and accessing rawly pt_lid at some offset.

FreeBSD has similar interface, but only working for the current thread:
pthread_getthreadid_np()

Linux:
pthread_getunique_np()
and thread id = pid: syscall(__NR_gettid)


Maybe something like it:
int pthread_tolwp_np(pthread_t, lwpid_t*);
int pthread_fromlwp_np(pthread_t*, lwpid_t);

When error - return value != 0 and set errno.
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