[issue10278] add time.wallclock() method

[Antoine Pitrou]

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

As discussed elsewhere, there should be a fallback when clock_gettime() fails for the given clock.

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stage: committed/rejected -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10278>
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