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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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