[issue10278] add time.wallclock() method

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

CLOCK_MONOTONIC, CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID are optional according to POSIX, which only mandates CLOCK_REALTIME. You should mention it in the docs.

You might also want to export clock_getres():
http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html

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<http://bugs.python.org/issue10278>
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