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Strict Two-Phase Locking

Lock implementation

Locking


bool grant_lock_immediately(entry, lock_mode)
{
    return
        queue.empty()
        and (  (lock_mode is SHARED 
                and (entry.lock_mode is UNLOCKED or SHARED))
             or
               (lock_mode is EXCLUSIVE 
                and entry.lock_mode is UNLOCKED))
}

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