1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 1997-2013, International Business Machines 5 * Corporation and others. All Rights Reserved. 6 * 7 ****************************************************************************** 8 */ 9 //---------------------------------------------------------------------------- 10 // File: mutex.h 11 // 12 // Lightweight C++ wrapper for umtx_ C mutex functions 13 // 14 // Author: Alan Liu 1/31/97 15 // History: 16 // 06/04/97 helena Updated setImplementation as per feedback from 5/21 drop. 17 // 04/07/1999 srl refocused as a thin wrapper 18 // 19 //---------------------------------------------------------------------------- 20 #ifndef MUTEX_H 21 #define MUTEX_H 22 23 #include "unicode/utypes.h" 24 #include "unicode/uobject.h" 25 #include "umutex.h" 26 27 U_NAMESPACE_BEGIN 28 29 //---------------------------------------------------------------------------- 30 // Code within that accesses shared static or global data should 31 // should instantiate a Mutex object while doing so. You should make your own 32 // private mutex where possible. 33 34 // For example: 35 // 36 // UMutex myMutex; 37 // 38 // void Function(int arg1, int arg2) 39 // { 40 // static Object* foo; // Shared read-write object 41 // Mutex mutex(&myMutex); // or no args for the global lock 42 // foo->Method(); 43 // // When 'mutex' goes out of scope and gets destroyed here, the lock is released 44 // } 45 // 46 // Note: Do NOT use the form 'Mutex mutex();' as that merely forward-declares a function 47 // returning a Mutex. This is a common mistake which silently slips through the 48 // compiler!! 49 // 50 51 class U_COMMON_API Mutex : public UMemory { 52 public: 53 inline Mutex(UMutex *mutex = NULL); 54 inline ~Mutex(); 55 56 private: 57 UMutex *fMutex; 58 59 Mutex(const Mutex &other); // forbid copying of this class 60 Mutex &operator=(const Mutex &other); // forbid copying of this class 61 }; 62 63 inline Mutex::Mutex(UMutex *mutex) 64 : fMutex(mutex) 65 { 66 umtx_lock(fMutex); 67 } 68 69 inline Mutex::~Mutex() 70 { 71 umtx_unlock(fMutex); 72 } 73 74 U_NAMESPACE_END 75 76 #endif //_MUTEX_ 77 //eof 78
