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