[Piglit] [PATCH] framework: fix running with mixed concurrency (neither -c or -1)

[Arkadiusz Hiler]

On Tue, May 08, 2018 at 10:32:26AM -0700, Dylan Baker wrote:
> test_list is an iterator, you can't walk an iterator more than once. To
> solve this we use itertools.tee, which creates a shared buffer for the
> iterators to draw from. This fixes errors like:
> 
> [000/480]
> Traceback (most recent call last):
>   File "./piglit", line 178, in <module>
>     main()
>   File "./piglit", line 174, in main
>     sys.exit(runner(args))
>   File "/home/user/piglit/framework/exceptions.py", line 51, in _inner
>     func(*args, **kwargs)
>   File "/home/user/piglit/framework/programs/run.py", line 370, in run
>     backend.finalize({'time_elapsed': time_elapsed.to_json()})
>   File "/home/user/piglit/framework/backends/json.py", line 163, in finalize
>     assert data['tests']
>   AssertionError
> 
> Thanks Tomi for figuring out what was wrong with the original patch!
> 
> CC: Michel Dänzer <michel at daenzer.net>
> CC: Tomi Sarvela <tomi.p.sarvela at intel.com>
> CC: "Juan A. Suarez Romero" <jasuarez at igalia.com>

Oh, just noticed that (well, actually Tomi told me about this).

I've sent another patch which fixes the same issue in a slightly
different way. Sorry for the duplication!

-- 
Cheers,
Arek