Hello-

The attached patch was discussed briefly on PR 54185 here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54185#c14
The test case for this PR sometimes fails due to random failures in
pthread_create() that are not related to the original PR. This patch fixes
it up by ignoring those failures. The test case was designed to repeat the
same test 1000 times to attempt to reproduce a race condition, so I think is
OK if some of those iterations are simply skipped.

Thanks for taking a look at it; I can commit it if it makes sense.

-Lewis