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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // WARNING: Thread local storage is a bit tricky to get right. Please make | 5 // WARNING: Thread local storage is a bit tricky to get right. Please make |
6 // sure that this is really the proper solution for what you're trying to | 6 // sure that this is really the proper solution for what you're trying to |
7 // achieve. Don't prematurely optimize, most likely you can just use a Lock. | 7 // achieve. Don't prematurely optimize, most likely you can just use a Lock. |
8 // | 8 // |
9 // These classes implement a wrapper around the platform's TLS storage | 9 // These classes implement a wrapper around the platform's TLS storage |
10 // mechanism. On construction, they will allocate a TLS slot, and free the | 10 // mechanism. On construction, they will allocate a TLS slot, and free the |
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42 // // Return the current MyClass associated with the calling thread, can be | 42 // // Return the current MyClass associated with the calling thread, can be |
43 // // NULL if there isn't a MyClass associated. | 43 // // NULL if there isn't a MyClass associated. |
44 // MyClass* MyClass::current() { | 44 // MyClass* MyClass::current() { |
45 // return Singleton<ThreadLocalPointer<MyClass> >::get()->Get(); | 45 // return Singleton<ThreadLocalPointer<MyClass> >::get()->Get(); |
46 // } | 46 // } |
47 | 47 |
48 #ifndef BASE_THREADING_THREAD_LOCAL_H_ | 48 #ifndef BASE_THREADING_THREAD_LOCAL_H_ |
49 #define BASE_THREADING_THREAD_LOCAL_H_ | 49 #define BASE_THREADING_THREAD_LOCAL_H_ |
50 #pragma once | 50 #pragma once |
51 | 51 |
52 #include "base/base_api.h" | 52 #include "base/base_export.h" |
53 #include "base/basictypes.h" | 53 #include "base/basictypes.h" |
54 | 54 |
55 #if defined(OS_POSIX) | 55 #if defined(OS_POSIX) |
56 #include <pthread.h> | 56 #include <pthread.h> |
57 #endif | 57 #endif |
58 | 58 |
59 namespace base { | 59 namespace base { |
60 | 60 |
61 namespace internal { | 61 namespace internal { |
62 | 62 |
63 // Helper functions that abstract the cross-platform APIs. Do not use directly. | 63 // Helper functions that abstract the cross-platform APIs. Do not use directly. |
64 struct BASE_API ThreadLocalPlatform { | 64 struct BASE_EXPORT ThreadLocalPlatform { |
65 #if defined(OS_WIN) | 65 #if defined(OS_WIN) |
66 typedef unsigned long SlotType; | 66 typedef unsigned long SlotType; |
67 #elif defined(OS_POSIX) | 67 #elif defined(OS_POSIX) |
68 typedef pthread_key_t SlotType; | 68 typedef pthread_key_t SlotType; |
69 #endif | 69 #endif |
70 | 70 |
71 static void AllocateSlot(SlotType& slot); | 71 static void AllocateSlot(SlotType& slot); |
72 static void FreeSlot(SlotType& slot); | 72 static void FreeSlot(SlotType& slot); |
73 static void* GetValueFromSlot(SlotType& slot); | 73 static void* GetValueFromSlot(SlotType& slot); |
74 static void SetValueInSlot(SlotType& slot, void* value); | 74 static void SetValueInSlot(SlotType& slot, void* value); |
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119 | 119 |
120 private: | 120 private: |
121 ThreadLocalPointer<void> tlp_; | 121 ThreadLocalPointer<void> tlp_; |
122 | 122 |
123 DISALLOW_COPY_AND_ASSIGN(ThreadLocalBoolean); | 123 DISALLOW_COPY_AND_ASSIGN(ThreadLocalBoolean); |
124 }; | 124 }; |
125 | 125 |
126 } // namespace base | 126 } // namespace base |
127 | 127 |
128 #endif // BASE_THREADING_THREAD_LOCAL_H_ | 128 #endif // BASE_THREADING_THREAD_LOCAL_H_ |
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