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Since this is a test module, leaking a couple of LWLock tranches is fine, but we want to discourage that pattern in third-party code. This commit teaches the module to create only one tranche and to store its ID in shared memory for use by other backends. Reported-by: Alexander Lakhin <exclusion@gmail.com> Reviewed-by: Sami Imseih <samimseih@gmail.com> Discussion: https://postgr.es/m/dd36d384-55df-4fc2-825c-5bc56c950fa9%40gmail.com