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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 the V8 project 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 #ifndef V8_ATOMIC_UTILS_H_ | 5 #ifndef V8_ATOMIC_UTILS_H_ |
6 #define V8_ATOMIC_UTILS_H_ | 6 #define V8_ATOMIC_UTILS_H_ |
7 | 7 |
8 #include <limits.h> | 8 #include <limits.h> |
9 | 9 |
10 #include "src/base/atomicops.h" | 10 #include "src/base/atomicops.h" |
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45 | 45 |
46 // Flag using T atomically. Also accepts void* as T. | 46 // Flag using T atomically. Also accepts void* as T. |
47 template <typename T> | 47 template <typename T> |
48 class AtomicValue { | 48 class AtomicValue { |
49 public: | 49 public: |
50 AtomicValue() : value_(0) {} | 50 AtomicValue() : value_(0) {} |
51 | 51 |
52 explicit AtomicValue(T initial) | 52 explicit AtomicValue(T initial) |
53 : value_(cast_helper<T>::to_storage_type(initial)) {} | 53 : value_(cast_helper<T>::to_storage_type(initial)) {} |
54 | 54 |
55 V8_INLINE T Value() { | 55 V8_INLINE T Value() const { |
56 return cast_helper<T>::to_return_type(base::Acquire_Load(&value_)); | 56 return cast_helper<T>::to_return_type(base::Acquire_Load(&value_)); |
57 } | 57 } |
58 | 58 |
59 V8_INLINE bool TrySetValue(T old_value, T new_value) { | 59 V8_INLINE bool TrySetValue(T old_value, T new_value) { |
60 return base::Release_CompareAndSwap( | 60 return base::Release_CompareAndSwap( |
61 &value_, cast_helper<T>::to_storage_type(old_value), | 61 &value_, cast_helper<T>::to_storage_type(old_value), |
62 cast_helper<T>::to_storage_type(new_value)) == | 62 cast_helper<T>::to_storage_type(new_value)) == |
63 cast_helper<T>::to_storage_type(old_value); | 63 cast_helper<T>::to_storage_type(old_value); |
64 } | 64 } |
65 | 65 |
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166 return static_cast<base::AtomicWord>(1) << element; | 166 return static_cast<base::AtomicWord>(1) << element; |
167 } | 167 } |
168 | 168 |
169 base::AtomicWord bits_; | 169 base::AtomicWord bits_; |
170 }; | 170 }; |
171 | 171 |
172 } // namespace base | 172 } // namespace base |
173 } // namespace v8 | 173 } // namespace v8 |
174 | 174 |
175 #endif // #define V8_ATOMIC_UTILS_H_ | 175 #endif // #define V8_ATOMIC_UTILS_H_ |
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