運用C++的構造，析構進行，加鎖解鎖。在函數進入的時候定義臨時變量。任何一個分支推出的時候都會調用析構函數。避免多分支出現的問題。?

1 #ifndef CPPUNIT_SYNCHRONIZEDOBJECT_H 2 #define CPPUNIT_SYNCHRONIZEDOBJECT_H 3 4 #include <cppunit/Portability.h> 5 6 7 CPPUNIT_NS_BEGIN 8 9 10 /*! \brief Base class for synchronized object. 11 * 12 * Synchronized object are object which members are used concurrently by mutiple 13 * threads. 14 * 15 * This class define the class SynchronizationObject which must be subclassed 16 * to implement an actual lock. 17 * 18 * Each instance of this class holds a pointer on a lock object. 19 * 20 * See src/msvc6/MfcSynchronizedObject.h for an example. 21 */ 22 class CPPUNIT_API SynchronizedObject 23 { 24 public: 25 /*! \brief Abstract synchronization object (mutex) 26 */ 27 class SynchronizationObject 28 { 29 public: 30 SynchronizationObject() {} 31 virtual ~SynchronizationObject() {} 32 33 virtual void lock() {} 34 virtual void unlock() {} 35 }; 36 37 /*! Constructs a SynchronizedObject object. 38 */ 39 SynchronizedObject( SynchronizationObject *syncObject =0 ); 40 41 /// Destructor. 42 virtual ~SynchronizedObject(); 43 44 protected: 45 /*! \brief Locks a synchronization object in the current scope. 46 */ 47 class ExclusiveZone 48 { 49 SynchronizationObject *m_syncObject; 50 51 public: 52 ExclusiveZone( SynchronizationObject *syncObject ) 53 : m_syncObject( syncObject ) 54 { 55 m_syncObject->lock(); 56 } 57 58 ~ExclusiveZone() 59 { 60 m_syncObject->unlock (); 61 } 62 }; 63 64 virtual void setSynchronizationObject( SynchronizationObject *syncObject ); 65 66 protected: 67 SynchronizationObject *m_syncObject; 68 69 private: 70 /// Prevents the use of the copy constructor. 71 SynchronizedObject( const SynchronizedObject &copy ); 72 73 /// Prevents the use of the copy operator. 74 void operator =( const SynchronizedObject &copy ); 75 }; 76 77 78 CPPUNIT_NS_END 79 80 #endif // CPPUNIT_SYNCHRONIZEDOBJECT_H

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1 #include <cppunit/SynchronizedObject.h> 2 3 4 CPPUNIT_NS_BEGIN 5 6 7 SynchronizedObject::SynchronizedObject( SynchronizationObject *syncObject ) 8 : m_syncObject( syncObject == 0 ? new SynchronizationObject() : 9 syncObject ) 10 { 11 } 12 13 14 SynchronizedObject::~SynchronizedObject() 15 { 16 delete m_syncObject; 17 } 18 19 20 /** Accept a new synchronization object for protection of this instance 21 * TestResult assumes ownership of the object 22 */ 23 void 24 SynchronizedObject::setSynchronizationObject( SynchronizationObject *syncObject ) 25 { 26 delete m_syncObject; 27 m_syncObject = syncObject; 28 } 29 30 31 CPPUNIT_NS_END

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轉載于:https://www.cnblogs.com/xiaoxiong0222/p/4491542.html

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