Logo ROOT  
Reference Guide
TSpinLockGuard.h
Go to the documentation of this file.
1 // @(#)root/meta:$Id$
2 // Author: Rene Brun 07/01/95
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TSpinLockGuard
13 #define ROOT_TSpinLockGuard
14 
15 #include <atomic>
16 
17 namespace ROOT {
18 namespace Internal {
19 
20 /**
21 * \class ROOT::Internal::TSpinLockGuard
22 * \brief A spin mutex-as-code-guard class.
23 * \ingroup Foundation
24 * This class allows to acquire spin locks in combination with a std::atomic_flag variable.
25 * For example:
26 * ~~~{.cpp}
27 * mutable std::atomic_flag fSpinLock;
28 * [...]
29 * ROOT::Internal::TSpinLockGuard slg(fSpinLock);
30 * // do something important
31 * [...]
32 * ~~~{.cpp}
33 */
34 
35 class TSpinLockGuard {
36  // Trivial spin lock guard
37 public:
38  TSpinLockGuard(std::atomic_flag& aflag) : fAFlag(aflag)
39  {
40  while (fAFlag.test_and_set(std::memory_order_acquire));
41  }
42  ~TSpinLockGuard() {
43  fAFlag.clear(std::memory_order_release);
44  }
45 
46 private:
47  std::atomic_flag& fAFlag;
48 };
49 
50 } // namespace Internal
51 } // namespace ROOT
52 
53 #endif // ROOT_TSpinLockGuard
ROOT::Internal::TSpinLockGuard::~TSpinLockGuard
~TSpinLockGuard()
Definition: TSpinLockGuard.h:54
ROOT::Internal::TSpinLockGuard::fAFlag
std::atomic_flag & fAFlag
Definition: TSpinLockGuard.h:59
ROOT::Internal::TSpinLockGuard::TSpinLockGuard
TSpinLockGuard(std::atomic_flag &aflag)
Definition: TSpinLockGuard.h:50
ROOT
VSD Structures.
Definition: StringConv.hxx:21