| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
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10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
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17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4ThreadLocalSingleton << 26 // $Id$
27 // 27 //
28 // Class description: << 28 // ---------------------------------------------------------------
>> 29 // GEANT 4 class header file
29 // 30 //
30 // This class implements a thread-private "sin << 31 // Class Description:
31 // private the singleton is not a singleton in << 32 // This class implements a thread-private "singleton". Being thread
32 // instance exists for each thread. << 33 // private the singleton is not a singleton in the term, but a different
33 // This class is a wrapper around the real obj << 34 // instance existis for each thread.
34 // make singleton. << 35 // This class is a wrapper around the real object that we need to
>> 36 // make singleton.
35 // 37 //
36 // Limitation: 38 // Limitation:
37 // The object that is made thread-private si << 39 // The object that is made thread-private singleton, should not
38 // contain any thread-local data member. Not << 40 // contain any G4ThreadLocal data member. Note that in general,
39 // if an object is to be thread-private it i << 41 // if object is to be thread-private it is unnecessary to mark
40 // any data-member as G4ThreadLocal. 42 // any data-member as G4ThreadLocal.
41 // << 43 //
42 // Performance issues: 44 // Performance issues:
43 // This class uses locks and mutexes. 45 // This class uses locks and mutexes.
44 // 46 //
45 // Example: 47 // Example:
46 // This is the singleton pattern often found << 48 // This is the singleton patter often found in G4 (sequential):
47 // class G4Class << 49 // class G4Class {
48 // { << 50 // private:
49 // private: << 51 // static G4Class* instance;
50 // static G4Class* instance; << 52 // G4Class() { ... }
51 // G4Class() { ... } << 53 // public:
52 // public: << 54 // static G4Class* GetInstance() {
53 // static G4Class* GetInstance() << 55 // static G4Class theInstance;
54 // { << 56 // if ( instance == 0 ) instance = &theInstance;
55 // static G4Class theInstance; << 57 // return instance;
56 // if ( instance == nullptr ) instance << 58 // }
57 // return instance; << 59 // };
58 // } << 60 // This is transformed to the following to implement a thread-local
59 // }; << 61 // singleton:
60 // This is transformed to the following to i << 62 // class G4Class {
61 // singleton: << 63 // private:
62 // class G4Class << 64 // static G4ThreadLocal G4Class* instance;
63 // { << 65 // G4Class() { ... }
64 // private: << 66 // public:
65 // static G4ThreadLocal G4Class* instanc << 67 // static G4Class* GetInstance() {
66 // G4Class() { ... } << 68 // if ( instance == 0 ) instance = new G4Class;
67 // public: << 69 // return instance;
68 // static G4Class* GetInstance() << 70 // }
69 // { << 71 // };
70 // if ( instance == nullptr ) instance << 72 // Note that this class also has a memory leak.
71 // return instance; << 73 //
72 // } << 74 // This class can be used as follows:
73 // }; << 75 // class G4Class {
74 // Note that this class also has a memory le << 76 // friend class G4ThreadLocalSingleton<G4Class>;
75 // << 77 // private:
76 // This class can be used as follows: << 78 // G4Class() { ... }
77 // class G4Class << 79 // public:
78 // { << 80 // static G4Class* GetInstance() {
79 // friend class G4ThreadLocalSingleton<G4C << 81 // static G4ThreadLocalSingleton<G4Class> instance;
80 // private: << 82 // return instance.Instance();
81 // G4Class() { ... } << 83 // }
82 // public: << 84 // };
83 // static G4Class* GetInstance() << 85 // Each thread has its own instance of G4Class.
84 // { << 86 // Deletion of G4Class instances is done at end of program.
85 // static G4ThreadLocalSingleton<G4Cla << 87 // Note the "friend" statement.
86 // return instance.Instance(); << 88 //
87 // } << 89 // History:
88 // }; << 90 // 28 October 2013: A. Dotti - First implementation
89 // Each thread has its own instance of G4Cla <<
90 // Deletion of G4Class instances is done at <<
91 // Note the "friend" statement. <<
92 91
93 // Author: A.Dotti, 28 October 2013 <<
94 // ------------------------------------------- <<
95 #ifndef G4TLSSINGLETON_HH 92 #ifndef G4TLSSINGLETON_HH
96 #define G4TLSSINGLETON_HH 1 << 93 #define G4TLSSINGLETON_HH
97 94
98 #include "G4AutoLock.hh" << 95 //Debug this code
99 #include "G4Cache.hh" << 96 //#define g4tlssdebug 1
100 #include "G4Backtrace.hh" <<
101 #include "G4Threading.hh" <<
102 97
>> 98 #include "G4Cache.hh"
103 #include <list> 99 #include <list>
104 #include <vector> <<
105 #include <functional> <<
106 100
107 // Forward declaration. See G4AutoDelete.hh << 101 //Forward declaration. See G4AutoDelete.hh
108 // << 102 namespace G4AutoDelete {
109 namespace G4AutoDelete << 103 template<class T>
110 { <<
111 template <class T> <<
112 void Register(T*); 104 void Register(T*);
113 } 105 }
114 106
115 template <class T> << 107 template<class T>
116 class G4ThreadLocalSingleton; << 108 class G4ThreadLocalSingleton : private G4Cache<T*> {
117 <<
118 // this explicit specialization holds all the <<
119 // to explicitly invoke the auto-deletion <<
120 template <> <<
121 class G4ThreadLocalSingleton<void> <<
122 { <<
123 private: <<
124 using fvector_t = std::vector<std::function< <<
125 <<
126 template <class T> <<
127 friend class G4ThreadLocalSingleton; <<
128 <<
129 static fvector_t& GetCallbacks(); <<
130 static G4Mutex& GetMutex(); <<
131 <<
132 public: <<
133 static void Clear(); <<
134 <<
135 template <typename FuncT> <<
136 static typename fvector_t::iterator Insert(F <<
137 { <<
138 G4AutoLock _lk{ GetMutex() }; <<
139 return GetCallbacks().emplace(GetCallbacks <<
140 std::forward <<
141 } <<
142 }; <<
143 <<
144 template <class T> <<
145 class G4ThreadLocalSingleton : private G4Cache <<
146 { <<
147 friend void G4AutoDelete::Register<T>(T*); 109 friend void G4AutoDelete::Register<T>(T*);
148 << 110 public:
149 public: <<
150 G4ThreadLocalSingleton(); 111 G4ThreadLocalSingleton();
151 // Creates thread-local singleton manager << 112 //Creates thread-local singleton manager
152 113
153 ~G4ThreadLocalSingleton() override; << 114 ~G4ThreadLocalSingleton();
154 115
155 G4ThreadLocalSingleton(const G4ThreadLocalSi << 116 T* Instance() const;
156 G4ThreadLocalSingleton(G4ThreadLocalSingleto << 117 //Returns a pointer to a thread-private instance of T
157 118
158 G4ThreadLocalSingleton& operator=(const G4Th << 119 private:
159 G4ThreadLocalSingleton& operator=(G4ThreadLo << 120 G4ThreadLocalSingleton( G4ThreadLocalSingleton& rhs);// {}
160 << 121 void Register(T* i) const;
161 T* Instance() const; <<
162 // Returns a pointer to a thread-private ins <<
163 <<
164 private: <<
165 void Register(T* i) const; <<
166 122
167 void Clear(); 123 void Clear();
168 124
169 mutable std::list<T*> instances; 125 mutable std::list<T*> instances;
170 mutable G4Mutex listm; 126 mutable G4Mutex listm;
171 }; 127 };
172 128
>> 129
173 //============================================ 130 //=============================================================
174 // Inline methods implementation << 131 // Implementation details follow
175 //============================================ 132 //=============================================================
176 << 133 #include "G4AutoLock.hh"
177 template <class T> << 134 template<class T>
178 G4ThreadLocalSingleton<T>::G4ThreadLocalSingle << 135 G4ThreadLocalSingleton<T>::G4ThreadLocalSingleton() : G4Cache<T*>() {
179 : G4Cache<T*>() <<
180 { <<
181 G4MUTEXINIT(listm); 136 G4MUTEXINIT(listm);
182 G4Cache<T*>::Put(nullptr); << 137 G4Cache<T*>::Put(static_cast<T*>(0));
183 // Uncomment below to find the origin of whe <<
184 /* <<
185 auto bt = G4Backtrace::GetDemangled<4, 1>( <<
186 [](const char* cstr) { return std::string{ <<
187 std::cout << "Backtrace to G4ThreadLocalSing <<
188 << G4Demangle<T>().c_str() << ">:\ <<
189 for(auto& itr : bt) <<
190 { <<
191 if(!itr.empty()) <<
192 std::cout << "\t" << itr << "\n"; <<
193 } <<
194 */ <<
195 G4ThreadLocalSingleton<void>::Insert([&]() { <<
196 // printf("Deleting G4ThreadLocalSingleton <<
197 // G4Demangle<T>().c_str()); <<
198 this->Clear(); <<
199 }); <<
200 } 138 }
201 139
202 template <class T> << 140 template<class T>
203 G4ThreadLocalSingleton<T>::~G4ThreadLocalSingl << 141 G4ThreadLocalSingleton<T>::~G4ThreadLocalSingleton() {
204 { <<
205 Clear(); 142 Clear();
206 G4MUTEXDESTROY(listm); 143 G4MUTEXDESTROY(listm);
207 } 144 }
208 145
209 template <class T> << 146 template<class T>
210 T* G4ThreadLocalSingleton<T>::Instance() const << 147 T* G4ThreadLocalSingleton<T>::Instance() const {
211 { << 148 T* instance = G4Cache<T*>::Get();
212 T* instance = G4Cache<T*>::Get(); << 149 if ( instance == static_cast<T*>(0) ) {
213 if(instance == static_cast<T*>(0)) << 150 instance = new T;
214 { << 151 G4Cache<T*>::Put( instance );
215 instance = new T; << 152 Register(instance);
216 G4Cache<T*>::Put(instance); << 153 }
217 Register(instance); << 154 return instance;
218 } 155 }
219 return instance; <<
220 } <<
221 156
222 template <class T> << 157 template<class T>
223 void G4ThreadLocalSingleton<T>::Register(T* i) << 158 G4ThreadLocalSingleton<T>::G4ThreadLocalSingleton( G4ThreadLocalSingleton&) {}
224 { << 159 template<class T>
>> 160 void G4ThreadLocalSingleton<T>::Register(T* i) const {
225 G4AutoLock l(&listm); 161 G4AutoLock l(&listm);
226 instances.push_back(i); 162 instances.push_back(i);
227 } 163 }
228 164
229 template <class T> << 165
230 void G4ThreadLocalSingleton<T>::Clear() << 166 template<class T>
231 { << 167 void G4ThreadLocalSingleton<T>::Clear() {
232 if(instances.empty()) << 168 G4AutoLock l(&listm);
233 return; << 169 while ( ! instances.empty() )
234 G4AutoLock l(&listm); << 170 {
235 while(!instances.empty()) << 171 T* thisinst = instances.front();
236 { << 172 instances.pop_front();
237 T* thisinst = instances.front(); << 173 if ( thisinst != 0 ) delete thisinst;
238 instances.pop_front(); << 174 }
239 delete thisinst; <<
240 } 175 }
241 } <<
242 176
243 #endif << 177 #endif //G4TLSSINGLETON_HH
244 178