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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 #include "src/runtime/runtime-utils.h" | 5 #include "src/runtime/runtime-utils.h" |
6 | 6 |
7 #include "src/arguments.h" | 7 #include "src/arguments.h" |
8 #include "src/base/macros.h" | 8 #include "src/base/macros.h" |
9 #include "src/base/platform/mutex.h" | 9 #include "src/base/platform/mutex.h" |
10 #include "src/conversions-inl.h" | 10 #include "src/conversions-inl.h" |
11 #include "src/factory.h" | 11 #include "src/factory.h" |
12 | 12 |
13 // Implement Atomic accesses to SharedArrayBuffers as defined in the | 13 // Implement Atomic accesses to SharedArrayBuffers as defined in the |
14 // SharedArrayBuffer draft spec, found here | 14 // SharedArrayBuffer draft spec, found here |
15 // https://github.com/lars-t-hansen/ecmascript_sharedmem | 15 // https://github.com/tc39/ecmascript_sharedmem |
16 | 16 |
17 namespace v8 { | 17 namespace v8 { |
18 namespace internal { | 18 namespace internal { |
19 | 19 |
20 namespace { | 20 namespace { |
21 | 21 |
22 inline bool AtomicIsLockFree(uint32_t size) { | 22 inline bool AtomicIsLockFree(uint32_t size) { |
23 return size == 1 || size == 2 || size == 4; | 23 return size == 1 || size == 2 || size == 4; |
24 } | 24 } |
25 | 25 |
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575 | 575 |
576 RUNTIME_FUNCTION(Runtime_AtomicsIsLockFree) { | 576 RUNTIME_FUNCTION(Runtime_AtomicsIsLockFree) { |
577 HandleScope scope(isolate); | 577 HandleScope scope(isolate); |
578 DCHECK(args.length() == 1); | 578 DCHECK(args.length() == 1); |
579 CONVERT_NUMBER_ARG_HANDLE_CHECKED(size, 0); | 579 CONVERT_NUMBER_ARG_HANDLE_CHECKED(size, 0); |
580 uint32_t usize = NumberToUint32(*size); | 580 uint32_t usize = NumberToUint32(*size); |
581 return isolate->heap()->ToBoolean(AtomicIsLockFree(usize)); | 581 return isolate->heap()->ToBoolean(AtomicIsLockFree(usize)); |
582 } | 582 } |
583 } // namespace internal | 583 } // namespace internal |
584 } // namespace v8 | 584 } // namespace v8 |
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