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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_VM_ATOMIC_H_ | 5 #ifndef RUNTIME_VM_ATOMIC_H_ |
6 #define RUNTIME_VM_ATOMIC_H_ | 6 #define RUNTIME_VM_ATOMIC_H_ |
7 | 7 |
8 #include "platform/globals.h" | 8 #include "platform/globals.h" |
9 | 9 |
10 #include "vm/allocation.h" | 10 #include "vm/allocation.h" |
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41 // | 41 // |
42 // NOTE: Not to be used for any atomic operations involving memory locations | 42 // NOTE: Not to be used for any atomic operations involving memory locations |
43 // that are accessed by generated code. | 43 // that are accessed by generated code. |
44 static void DecrementBy(intptr_t* p, intptr_t value); | 44 static void DecrementBy(intptr_t* p, intptr_t value); |
45 | 45 |
46 // Atomically compare *ptr to old_value, and if equal, store new_value. | 46 // Atomically compare *ptr to old_value, and if equal, store new_value. |
47 // Returns the original value at ptr. | 47 // Returns the original value at ptr. |
48 // | 48 // |
49 // NOTE: OK to use with memory locations that are accessed by generated code | 49 // NOTE: OK to use with memory locations that are accessed by generated code |
50 static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value); | 50 static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value); |
51 static uint32_t CompareAndSwapUint32( | 51 static uint32_t CompareAndSwapUint32(uint32_t* ptr, |
52 uint32_t* ptr, uint32_t old_value, uint32_t new_value); | 52 uint32_t old_value, |
| 53 uint32_t new_value); |
53 | 54 |
54 // Performs a load of a word from 'ptr', but without any guarantees about | 55 // Performs a load of a word from 'ptr', but without any guarantees about |
55 // memory order (i.e., no load barriers/fences). | 56 // memory order (i.e., no load barriers/fences). |
56 template <typename T> | 57 template <typename T> |
57 static T LoadRelaxed(T* ptr) { | 58 static T LoadRelaxed(T* ptr) { |
58 return *static_cast<volatile T*>(ptr); | 59 return *static_cast<volatile T*>(ptr); |
59 } | 60 } |
60 }; | 61 }; |
61 | 62 |
62 | 63 |
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80 #include "vm/atomic_linux.h" | 81 #include "vm/atomic_linux.h" |
81 #elif defined(TARGET_OS_MACOS) | 82 #elif defined(TARGET_OS_MACOS) |
82 #include "vm/atomic_macos.h" | 83 #include "vm/atomic_macos.h" |
83 #elif defined(TARGET_OS_WINDOWS) | 84 #elif defined(TARGET_OS_WINDOWS) |
84 #include "vm/atomic_win.h" | 85 #include "vm/atomic_win.h" |
85 #else | 86 #else |
86 #error Unknown target os. | 87 #error Unknown target os. |
87 #endif | 88 #endif |
88 | 89 |
89 #endif // RUNTIME_VM_ATOMIC_H_ | 90 #endif // RUNTIME_VM_ATOMIC_H_ |
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