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cache: add a method to get estimated cache size

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Estimated because there is no lock preventing the result from
changing before it is used.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-12-05 20:27:18 -05:00
parent 331cb142e3
commit ece58cc910
1 changed files with 10 additions and 1 deletions
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11
include/crucible/cache.h
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@ -30,7 +30,7 @@ namespace crucible {
map<Key, ListIter> m_map;
LockSet<Key> m_lockset;
size_t m_max_size;
mutex m_mutex;
mutable mutex m_mutex;
void check_overflow();
void recent_use(ListIter vp);
@ -48,6 +48,7 @@ namespace crucible {
void expire(Arguments... args);
void insert(const Return &r, Arguments... args);
void clear();
size_t size() const;
};
template <class Return, class... Arguments>
@ -190,6 +191,14 @@ namespace crucible {
lock.unlock();
}
template <class Return, class... Arguments>
size_t
LRUCache<Return, Arguments...>::size() const
{
unique_lock<mutex> lock(m_mutex);
return m_map.size();
}
template<class Return, class... Arguments>
Return
LRUCache<Return, Arguments...>::operator()(Arguments... args)