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When a thread creates a new session for a server, if none was known yet, we assign the thread id (hence the reused_sess index) to a shared variable so that other threads will later be able to find it when they don't have one yet. For now we only set and clear the pointer upon session creation, we do not yet pick it. Note that we could have done it per thread-group, so as to avoid any cross-thread exchanges, but it's anticipated that this is essentially used during startup, at a moment where the cost of inter-thread contention is very low compared to the ability to restart at full speed, which explains why instead we store a single entry.