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
3// found in the LICENSE file.
4
5#include "src/runtime/runtime-utils.h"
6
7#include "src/arguments.h"
8#include "src/base/platform/time.h"
9#include "src/conversions-inl.h"
10#include "src/futex-emulation.h"
11#include "src/globals.h"
12
13// Implement Futex API for SharedArrayBuffers as defined in the
14// SharedArrayBuffer draft spec, found here:
15// https://github.com/tc39/ecmascript_sharedmem
16
17namespace v8 {
18namespace internal {
19
20RUNTIME_FUNCTION(Runtime_AtomicsWait) {
21  HandleScope scope(isolate);
22  DCHECK(args.length() == 4);
23  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
24  CONVERT_SIZE_ARG_CHECKED(index, 1);
25  CONVERT_INT32_ARG_CHECKED(value, 2);
26  CONVERT_DOUBLE_ARG_CHECKED(timeout, 3);
27  CHECK(sta->GetBuffer()->is_shared());
28  CHECK_LT(index, NumberToSize(sta->length()));
29  CHECK_EQ(sta->type(), kExternalInt32Array);
30  CHECK(timeout == V8_INFINITY || !std::isnan(timeout));
31
32  Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
33  size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
34
35  return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout);
36}
37
38RUNTIME_FUNCTION(Runtime_AtomicsWake) {
39  HandleScope scope(isolate);
40  DCHECK(args.length() == 3);
41  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
42  CONVERT_SIZE_ARG_CHECKED(index, 1);
43  CONVERT_INT32_ARG_CHECKED(count, 2);
44  CHECK(sta->GetBuffer()->is_shared());
45  CHECK_LT(index, NumberToSize(sta->length()));
46  CHECK_EQ(sta->type(), kExternalInt32Array);
47
48  Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
49  size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
50
51  return FutexEmulation::Wake(isolate, array_buffer, addr, count);
52}
53
54RUNTIME_FUNCTION(Runtime_AtomicsNumWaitersForTesting) {
55  HandleScope scope(isolate);
56  DCHECK(args.length() == 2);
57  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
58  CONVERT_SIZE_ARG_CHECKED(index, 1);
59  CHECK(sta->GetBuffer()->is_shared());
60  CHECK_LT(index, NumberToSize(sta->length()));
61  CHECK_EQ(sta->type(), kExternalInt32Array);
62
63  Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
64  size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
65
66  return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr);
67}
68}  // namespace internal
69}  // namespace v8
70