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File indexing completed on 2025-02-21 10:00:33
0001 /***********************************************************************************\ 0002 * (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations * 0003 * * 0004 * This software is distributed under the terms of the Apache version 2 licence, * 0005 * copied verbatim in the file "LICENSE". * 0006 * * 0007 * In applying this licence, CERN does not waive the privileges and immunities * 0008 * granted to it by virtue of its status as an Intergovernmental Organization * 0009 * or submit itself to any jurisdiction. * 0010 \***********************************************************************************/ 0011 #ifndef GAUDI_LOCKEDCHRONO_H 0012 #define GAUDI_LOCKEDCHRONO_H 1 0013 // =========================================================================== 0014 // Include files 0015 // =========================================================================== 0016 // GaudiKernel 0017 // =========================================================================== 0018 #include "GaudiKernel/ChronoEntity.h" 0019 // =========================================================================== 0020 namespace Gaudi { 0021 // ========================================================================= 0022 namespace Utils { 0023 // ======================================================================= 0024 /** @class LockedChrono 0025 * 0026 * Helper object, useful for measurement of CPU-performance 0027 * of highly-recursive structures, e.g. Data-On-Demand service, 0028 * complex algorithms, etc... 0029 * 0030 * @code 0031 * 0032 * class MyClass ... 0033 * { 0034 * 0035 * public: 0036 * 0037 * void doSomethingRecursive() const 0038 * { 0039 * ... 0040 * LockedChrono timer ( m_chrono , m_lock ) ; 0041 * ... 0042 * // some direct or indirect recursive call: 0043 * if ( ... ) { doSomethingRecursive () ; } 0044 * ... 0045 * } 0046 * 0047 * private: 0048 * 0049 * /// the lock 0050 * mutable bool m_lock ; // lock 0051 * /// the actual timer 0052 * mutable ChronoEntity m_chrono ; // actual timer 0053 * 0054 * }; 0055 * @endcode 0056 * 0057 * @author Vanya BELYAEV Ivan.Belyaev@nikhef.nl 0058 * @date 2009-08-10 0059 */ 0060 class LockedChrono { 0061 public: 0062 // ====================================================================== 0063 /// constructor from the actual timer: start the timer 0064 LockedChrono( ChronoEntity& c, bool& lock ) : m_timer( c ), m_locker( lock ) { 0065 if ( !lock ) { 0066 m_timer.start(); 0067 m_locker = true; 0068 m_locked = true; 0069 } 0070 } 0071 /// destructor: 0072 ~LockedChrono() { 0073 if ( m_locked ) { 0074 m_timer.stop(); 0075 m_locker = false; 0076 } 0077 } 0078 // ====================================================================== 0079 /// no default constructor 0080 LockedChrono() = delete; 0081 // ====================================================================== 0082 private: 0083 // ====================================================================== 0084 /// the actual timer 0085 ChronoEntity& m_timer; // the actual timer 0086 /// the actual locker 0087 bool& m_locker; // the actual locker 0088 /// locked ? 0089 bool m_locked = false; // locked ? 0090 // ====================================================================== 0091 }; 0092 // ======================================================================== 0093 } // namespace Utils 0094 // ========================================================================== 0095 } // end of namespace Gaudi 0096 // ============================================================================ 0097 // The END 0098 // ============================================================================ 0099 #endif // GAUDI_LOCKEDCHRONO_H
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