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FreeBSD doesn't provide CLOCK_PROCESS_CPUTIME_ID, but CLOCK_PROF. CLOCK_PROF can be used instead of getrusage(), its precision can be read using clock_getres(). Something like "> #if defined(CLOCK_PROF) && defined(__FreeBSD__)" can be used. (By the way, "#if defined(__linux__)" may be enough)
I read somewhere than CLOCK_PROF is the user+system CPU time of the *current thread* on OpenBSD. I can be checked by the following unit test:
 def test_process_time_threads(self):
 class BusyThread(threading.Thread):
 def run(self):
 timeout = monotonic() + 1.0
 loops = 1
 while monotonic() < timeout:
 i = 0
 while i < loops:
 i += 1
 loops *= 2
 t1 = process_time()
 thread = BusyThread()
 thread.start()
 thread.join()
 t2 = process_time()
 self.assertGreater(t2 - t1, 0.9)
--
perf_counter() should remember if win32_perf_counter() failed or not, as the pseudo-code of the PEP. I prefer to leave clock() unchanged to keep backward compatibility.