1 //===------------------SharedCluster.h --------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLDB_UTILITY_SHAREDCLUSTER_H
10 #define LLDB_UTILITY_SHAREDCLUSTER_H
11 
12 #include "lldb/Utility/LLDBAssert.h"
13 #include "llvm/ADT/STLExtras.h"
14 #include "llvm/ADT/SmallVector.h"
15 
16 #include <memory>
17 #include <mutex>
18 
19 namespace lldb_private {
20 
21 template <class T>
22 class ClusterManager : public std::enable_shared_from_this<ClusterManager<T>> {
23 public:
24   static std::shared_ptr<ClusterManager> Create() {
25     return std::shared_ptr<ClusterManager>(new ClusterManager());
26   }
27 
28   ~ClusterManager() {
29     for (T *obj : m_objects)
30       delete obj;
31   }
32 
33   void ManageObject(T *new_object) {
34     std::lock_guard<std::mutex> guard(m_mutex);
35     assert(!llvm::is_contained(m_objects, new_object) &&
36            "ManageObject called twice for the same object?");
37     m_objects.push_back(new_object);
38   }
39 
40   std::shared_ptr<T> GetSharedPointer(T *desired_object) {
41     std::lock_guard<std::mutex> guard(m_mutex);
42     auto this_sp = this->shared_from_this();
43     if (!llvm::is_contained(m_objects, desired_object)) {
44       lldbassert(false && "object not found in shared cluster when expected");
45       desired_object = nullptr;
46     }
47     return {std::move(this_sp), desired_object};
48   }
49 
50 private:
51   ClusterManager() : m_objects() {}
52 
53   llvm::SmallVector<T *, 16> m_objects;
54   std::mutex m_mutex;
55 };
56 
57 } // namespace lldb_private
58 
59 #endif // LLDB_UTILITY_SHAREDCLUSTER_H
60