[PATCH] support: Add support for delayed test failure reporting

[Florian Weimer]

On 12/12/2016 02:50 PM, Florian Weimer wrote:
> I need this for the container and resolver tests, which may end up
> detecting errors in code which does not run on the main thread/process.
>
> A MAP_SHARED mapping is used to share the test status across the entire
> process group spawned from the test driver.
>
> Torvald, do the concurrency bits in support/support_record_failure.c
> look okay to you?

Torvald indicated off-list I should use relaxed MO here, so I updated 
the patch accordingly.  I added the TEST_VERIFY macro, too.  Committed.

Thanks,
Florian
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