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fusefs: fix a race condition in the allow_other test

Description

fusefs: fix a race condition in the allow_other test

The test could occasionally hang if the parent's SIGUSR2 signal arrived
before the child had pause()d. Using POSIX semaphores precludes that
possibility.

Sponsored by: The FreeBSD Foundation

Details

Provenance
asomersAuthored on
Parents
rS345562: x86: Use XSAVEOPT for fpusave(), when available
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