Benny Halevy 43bf0f9356
reader_concurrency_semaphore: add stop method ...
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 >
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43bf0f9356