1 | //===-- ThreadSafeValue.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_CORE_THREADSAFEVALUE_H |
10 | #define LLDB_CORE_THREADSAFEVALUE_H |
11 | |
12 | #include <mutex> |
13 | |
14 | #include "lldb/lldb-defines.h" |
15 | |
16 | namespace lldb_private { |
17 | |
18 | template <class T> class ThreadSafeValue { |
19 | public: |
20 | ThreadSafeValue() = default; |
21 | ThreadSafeValue(const T &value) : m_value(value) {} |
22 | |
23 | ~ThreadSafeValue() = default; |
24 | |
25 | T GetValue() const { |
26 | T value; |
27 | { |
28 | std::lock_guard<std::recursive_mutex> guard(m_mutex); |
29 | value = m_value; |
30 | } |
31 | return value; |
32 | } |
33 | |
34 | // Call this if you have already manually locked the mutex using the |
35 | // GetMutex() accessor |
36 | const T &GetValueNoLock() const { return m_value; } |
37 | |
38 | void SetValue(const T &value) { |
39 | std::lock_guard<std::recursive_mutex> guard(m_mutex); |
40 | m_value = value; |
41 | } |
42 | |
43 | // Call this if you have already manually locked the mutex using the |
44 | // GetMutex() accessor |
45 | // coverity[missing_lock] |
46 | void SetValueNoLock(const T &value) { m_value = value; } |
47 | |
48 | std::recursive_mutex &GetMutex() { return m_mutex; } |
49 | |
50 | private: |
51 | T m_value; |
52 | mutable std::recursive_mutex m_mutex; |
53 | |
54 | // For ThreadSafeValue only |
55 | ThreadSafeValue(const ThreadSafeValue &) = delete; |
56 | const ThreadSafeValue &operator=(const ThreadSafeValue &) = delete; |
57 | }; |
58 | |
59 | } // namespace lldb_private |
60 | #endif // LLDB_CORE_THREADSAFEVALUE_H |
61 | |