1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 1997-2003, 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 // UMTX myMutex; 37 // 38 // int InitializeMyMutex() 39 // { 40 // umtx_init( &myMutex ); 41 // return 0; 42 // } 43 // 44 // static int initializeMyMutex = InitializeMyMutex(); 45 // 46 // void Function(int arg1, int arg2) 47 // { 48 // static Object* foo; // Shared read-write object 49 // Mutex mutex(&myMutex); // or no args for the global lock 50 // foo->Method(); 51 // // When 'mutex' goes out of scope and gets destroyed here, the lock is released 52 // } 53 // 54 // Note: Do NOT use the form 'Mutex mutex();' as that merely forward-declares a function 55 // returning a Mutex. This is a common mistake which silently slips through the 56 // compiler!! 57 // 58 59 class U_COMMON_API Mutex : public UMemory { 60 public: 61 inline Mutex(UMTX *mutex = NULL); 62 inline ~Mutex(); 63 64 private: 65 UMTX *fMutex; 66 67 Mutex(const Mutex &other); // forbid copying of this class 68 Mutex &operator=(const Mutex &other); // forbid copying of this class 69 }; 70 71 inline Mutex::Mutex(UMTX *mutex) 72 : fMutex(mutex) 73 { 74 umtx_lock(fMutex); 75 } 76 77 inline Mutex::~Mutex() 78 { 79 umtx_unlock(fMutex); 80 } 81 82 U_NAMESPACE_END 83 84 #endif //_MUTEX_ 85 //eof 86
