import 15.2.0 Octopus source

[ceph.git] / ceph / src / common / item_history.h

diff --git a/ceph/src/common/item_history.h b/ceph/src/common/item_history.h
index 351d5ba79f027688a7610c47821ef959044cecd7..87512a28c52e6939fdf09a1ad9df1b7fe8520d45 100644 (file)
--- a/ceph/src/common/item_history.h
+++ b/ceph/src/common/item_history.h
@@ -13,57 +13,8 @@ the latest value and continue using it as long as they want.  This container
 is only appropriate for values that are updated a handful of times over their
 total lifetime.
 
-There is a prune() method to throw out old values, but it should only be used
-if the caller has some way of knowing all readers are done.
-
 */
 
-template<class T>
-class mutable_item_history {
-private:
-  std::mutex lock;
-  std::list<T> history;
-  T *current = nullptr;
-
-public:
-  mutable_item_history() {
-    history.emplace_back(T());
-    current = &history.back();
-  }
-
-  // readers are lock-free
-  const T& operator*() const {
-    return *current;
-  }
-  const T *operator->() const {
-    return current;
-  }
-
-  // non-const variants (be careful!)
-  T& operator*() {
-    return *current;
-  }
-  T *operator->() {
-    return current;
-  }
-
-  // writes are serialized
-  const T& operator=(const T& other) {
-    std::lock_guard l(lock);
-    history.push_back(other);
-    current = &history.back();
-    return *current;
-  }
-
-  void prune() {
-    // note: this is not necessarily thread-safe wrt readers
-    std::lock_guard l(lock);
-    while (history.size() > 1) {
-      history.pop_front();
-    }
-  }
-};
-
 template<class T>
 class safe_item_history {
 private:
@@ -93,11 +44,4 @@ public:
     return *current;
   }
 
-  void prune() {
-    // note: this is not necessarily thread-safe wrt readers
-    std::lock_guard l(lock);
-    while (history.size() > 1) {
-      history.pop_front();
-    }
-  }
 };