1 //===-- ThreadSafeValue.h ---------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef liblldb_ThreadSafeValue_h_
11 #define liblldb_ThreadSafeValue_h_
12 
13 
14 #include <mutex>
15 
16 #include "lldb/lldb-defines.h"
17 
18 namespace lldb_private {
19 
20 template <class T> class ThreadSafeValue {
21 public:
22   //------------------------------------------------------------------
23   // Constructors and Destructors
24   //------------------------------------------------------------------
ThreadSafeValue()25   ThreadSafeValue() : m_value(), m_mutex() {}
26 
ThreadSafeValue(const T & value)27   ThreadSafeValue(const T &value) : m_value(value), m_mutex() {}
28 
~ThreadSafeValue()29   ~ThreadSafeValue() {}
30 
GetValue()31   T GetValue() const {
32     T value;
33     {
34       std::lock_guard<std::recursive_mutex> guard(m_mutex);
35       value = m_value;
36     }
37     return value;
38   }
39 
40   // Call this if you have already manually locked the mutex using the
41   // GetMutex() accessor
GetValueNoLock()42   const T &GetValueNoLock() const { return m_value; }
43 
SetValue(const T & value)44   void SetValue(const T &value) {
45     std::lock_guard<std::recursive_mutex> guard(m_mutex);
46     m_value = value;
47   }
48 
49   // Call this if you have already manually locked the mutex using the
50   // GetMutex() accessor
SetValueNoLock(const T & value)51   void SetValueNoLock(const T &value) { m_value = value; }
52 
GetMutex()53   std::recursive_mutex &GetMutex() { return m_mutex; }
54 
55 private:
56   T m_value;
57   mutable std::recursive_mutex m_mutex;
58 
59   //------------------------------------------------------------------
60   // For ThreadSafeValue only
61   //------------------------------------------------------------------
62   DISALLOW_COPY_AND_ASSIGN(ThreadSafeValue);
63 };
64 
65 } // namespace lldb_private
66 #endif // liblldb_ThreadSafeValue_h_
67