The System V semaphores on z/OS require explicit ending of the worker
threads and cleanup at process exit. The user will have to manually
cleanup these resources that are left behind. Instead use the custom
semaphore implementation which uses posix mutexes and condition
variables which are cleaned up automatically on process exit.
PR-URL: https://github.com/libuv/libuv/pull/1805
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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