1 /* 2 Copyright (c) 2005-2020 Intel Corporation 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 #ifndef _TBB_tls_H 18 #define _TBB_tls_H 19 20 #if USE_PTHREAD 21 #include <pthread.h> 22 #else /* assume USE_WINTHREAD */ 23 #include "tbb/machine/windows_api.h" 24 #endif 25 26 namespace tbb { 27 28 namespace internal { 29 30 typedef void (*tls_dtor_t)(void*); 31 32 //! Basic cross-platform wrapper class for TLS operations. 33 template <typename T> 34 class basic_tls { 35 #if USE_PTHREAD 36 typedef pthread_key_t tls_key_t; 37 public: 38 int create( tls_dtor_t dtor = NULL ) { 39 return pthread_key_create(&my_key, dtor); 40 } destroy()41 int destroy() { return pthread_key_delete(my_key); } set(T value)42 void set( T value ) { pthread_setspecific(my_key, (void*)value); } get()43 T get() { return (T)pthread_getspecific(my_key); } 44 #else /* USE_WINTHREAD */ 45 typedef DWORD tls_key_t; 46 public: 47 #if !__TBB_WIN8UI_SUPPORT 48 int create() { 49 tls_key_t tmp = TlsAlloc(); 50 if( tmp==TLS_OUT_OF_INDEXES ) 51 return TLS_OUT_OF_INDEXES; 52 my_key = tmp; 53 return 0; 54 } 55 int destroy() { TlsFree(my_key); my_key=0; return 0; } 56 void set( T value ) { TlsSetValue(my_key, (LPVOID)value); } 57 T get() { return (T)TlsGetValue(my_key); } 58 #else /*!__TBB_WIN8UI_SUPPORT*/ 59 int create() { 60 tls_key_t tmp = FlsAlloc(NULL); 61 if( tmp== (DWORD)0xFFFFFFFF ) 62 return (DWORD)0xFFFFFFFF; 63 my_key = tmp; 64 return 0; 65 } 66 int destroy() { FlsFree(my_key); my_key=0; return 0; } 67 void set( T value ) { FlsSetValue(my_key, (LPVOID)value); } 68 T get() { return (T)FlsGetValue(my_key); } 69 #endif /* !__TBB_WIN8UI_SUPPORT */ 70 #endif /* USE_WINTHREAD */ 71 private: 72 tls_key_t my_key; 73 }; 74 75 //! More advanced TLS support template class. 76 /** It supports RAII and to some extent mimic __declspec(thread) variables. */ 77 template <typename T> 78 class tls : public basic_tls<T> { 79 typedef basic_tls<T> base; 80 public: tls()81 tls() { base::create(); } ~tls()82 ~tls() { base::destroy(); } 83 T operator=(T value) { base::set(value); return value; } T()84 operator T() { return base::get(); } 85 }; 86 87 template <typename T> 88 class tls<T*> : basic_tls<T*> { 89 typedef basic_tls<T*> base; internal_dtor(void * ptr)90 static void internal_dtor(void* ptr) { 91 if (ptr) delete (T*)ptr; 92 } internal_get()93 T* internal_get() { 94 T* result = base::get(); 95 if (!result) { 96 result = new T; 97 base::set(result); 98 } 99 return result; 100 } 101 public: tls()102 tls() { 103 #if USE_PTHREAD 104 base::create( internal_dtor ); 105 #else 106 base::create(); 107 #endif 108 } ~tls()109 ~tls() { base::destroy(); } 110 T* operator=(T* value) { base::set(value); return value; } 111 operator T*() { return internal_get(); } 112 T* operator->() { return internal_get(); } 113 T& operator*() { return *internal_get(); } 114 }; 115 116 } // namespace internal 117 118 } // namespace tbb 119 120 #endif /* _TBB_tls_H */ 121