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43bf0f9356
In addition to clear_inactive_reads, that's currently called when the database object is destroyed, introduce a stop() method that will: 1. wait on all background closes of inactive_reads. 2. close all present inactive_reads and waits on their close. 3. signal waiters on the wait_list via broken() with a proper exception indicating that the semaphore was closed. In addition, assert in the semaphore's destructor that it has no remaining inactive reads. Stop must be called from whoever owns the r_c_s. Mainly, from database::stop. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>