1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
(function(global, utils) {
"use strict";
%CheckIsBootstrapping();
// -------------------------------------------------------------------
// Imports
var GlobalObject = global.Object;
var MakeTypeError;
var MaxSimple;
var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
utils.Import(function(from) {
MakeTypeError = from.MakeTypeError;
MaxSimple = from.MaxSimple;
});
// -------------------------------------------------------------------
function CheckSharedIntegerTypedArray(ia) {
if (!%IsSharedIntegerTypedArray(ia)) {
throw MakeTypeError(kNotIntegerSharedTypedArray, ia);
}
}
function CheckSharedInteger32TypedArray(ia) {
CheckSharedIntegerTypedArray(ia);
if (!%IsSharedInteger32TypedArray(ia)) {
throw MakeTypeError(kNotInt32SharedTypedArray, ia);
}
}
//-------------------------------------------------------------------
function AtomicsCompareExchangeJS(sta, index, oldValue, newValue) {
CheckSharedIntegerTypedArray(sta);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(sta)) {
return UNDEFINED;
}
oldValue = TO_NUMBER(oldValue);
newValue = TO_NUMBER(newValue);
return %_AtomicsCompareExchange(sta, index, oldValue, newValue);
}
function AtomicsLoadJS(sta, index) {
CheckSharedIntegerTypedArray(sta);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(sta)) {
return UNDEFINED;
}
return %_AtomicsLoad(sta, index);
}
function AtomicsStoreJS(sta, index, value) {
CheckSharedIntegerTypedArray(sta);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(sta)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsStore(sta, index, value);
}
function AtomicsAddJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsAdd(ia, index, value);
}
function AtomicsSubJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsSub(ia, index, value);
}
function AtomicsAndJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsAnd(ia, index, value);
}
function AtomicsOrJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsOr(ia, index, value);
}
function AtomicsXorJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsXor(ia, index, value);
}
function AtomicsExchangeJS(ia, index, value) {
CheckSharedIntegerTypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
value = TO_NUMBER(value);
return %_AtomicsExchange(ia, index, value);
}
function AtomicsIsLockFreeJS(size) {
return %_AtomicsIsLockFree(size);
}
// Futexes
function AtomicsFutexWaitJS(ia, index, value, timeout) {
CheckSharedInteger32TypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
if (IS_UNDEFINED(timeout)) {
timeout = INFINITY;
} else {
timeout = TO_NUMBER(timeout);
if (NUMBER_IS_NAN(timeout)) {
timeout = INFINITY;
} else {
timeout = MaxSimple(0, timeout);
}
}
return %AtomicsFutexWait(ia, index, value, timeout);
}
function AtomicsFutexWakeJS(ia, index, count) {
CheckSharedInteger32TypedArray(ia);
index = TO_INTEGER(index);
if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
count = MaxSimple(0, TO_INTEGER(count));
return %AtomicsFutexWake(ia, index, count);
}
function AtomicsFutexWakeOrRequeueJS(ia, index1, count, value, index2) {
CheckSharedInteger32TypedArray(ia);
index1 = TO_INTEGER(index1);
count = MaxSimple(0, TO_INTEGER(count));
value = TO_INT32(value);
index2 = TO_INTEGER(index2);
if (index1 < 0 || index1 >= %_TypedArrayGetLength(ia) ||
index2 < 0 || index2 >= %_TypedArrayGetLength(ia)) {
return UNDEFINED;
}
return %AtomicsFutexWakeOrRequeue(ia, index1, count, value, index2);
}
// -------------------------------------------------------------------
function AtomicsConstructor() {}
var Atomics = new AtomicsConstructor();
%InternalSetPrototype(Atomics, GlobalObject.prototype);
%AddNamedProperty(global, "Atomics", Atomics, DONT_ENUM);
%FunctionSetInstanceClassName(AtomicsConstructor, 'Atomics');
%AddNamedProperty(Atomics, toStringTagSymbol, "Atomics", READ_ONLY | DONT_ENUM);
// These must match the values in src/futex-emulation.h
utils.InstallConstants(Atomics, [
"OK", 0,
"NOTEQUAL", -1,
"TIMEDOUT", -2,
]);
utils.InstallFunctions(Atomics, DONT_ENUM, [
"compareExchange", AtomicsCompareExchangeJS,
"load", AtomicsLoadJS,
"store", AtomicsStoreJS,
"add", AtomicsAddJS,
"sub", AtomicsSubJS,
"and", AtomicsAndJS,
"or", AtomicsOrJS,
"xor", AtomicsXorJS,
"exchange", AtomicsExchangeJS,
"isLockFree", AtomicsIsLockFreeJS,
"futexWait", AtomicsFutexWaitJS,
"futexWake", AtomicsFutexWakeJS,
"futexWakeOrRequeue", AtomicsFutexWakeOrRequeueJS,
]);
})
|
