1// Copyright 2015 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --harmony-sharedarraybuffer
29
30if (this.Worker) {
31
32  (function TestTransfer() {
33    var workerScript =
34      `onmessage = function(m) {
35       var sab = m;
36       var ta = new Uint32Array(sab);
37       if (sab.byteLength !== 16) {
38         throw new Error('SharedArrayBuffer transfer byteLength');
39       }
40       for (var i = 0; i < 4; ++i) {
41         if (ta[i] !== i) {
42           throw new Error('SharedArrayBuffer transfer value ' + i);
43         }
44       }
45        // Atomically update ta[0]
46        Atomics.store(ta, 0, 100);
47      };`;
48
49    var w = new Worker(workerScript);
50
51    var sab = new SharedArrayBuffer(16);
52    var ta = new Uint32Array(sab);
53    for (var i = 0; i < 4; ++i) {
54      ta[i] = i;
55    }
56
57    // Transfer SharedArrayBuffer
58    w.postMessage(sab, [sab]);
59    assertEquals(16, sab.byteLength);  // ArrayBuffer should not be neutered.
60
61    // Spinwait for the worker to update ta[0]
62    var ta0;
63    while ((ta0 = Atomics.load(ta, 0)) == 0) {}
64
65    assertEquals(100, ta0);
66
67    w.terminate();
68
69    assertEquals(16, sab.byteLength);  // Still not neutered.
70  })();
71
72  (function TestTransferMulti() {
73    var workerScript =
74      `onmessage = function(msg) {
75       var sab = msg.sab;
76       var id = msg.id;
77       var ta = new Uint32Array(sab);
78       Atomics.store(ta, id, 1);
79       postMessage(id);
80      };`;
81
82    var sab = new SharedArrayBuffer(16);
83    var ta = new Uint32Array(sab);
84
85    var id;
86    var workers = [];
87    for (id = 0; id < 4; ++id) {
88      workers[id] = new Worker(workerScript);
89      workers[id].postMessage({sab: sab, id: id}, [sab]);
90    }
91
92    // Spinwait for each worker to update ta[id]
93    var count = 0;
94    while (count < 4) {
95      for (id = 0; id < 4; ++id) {
96        if (Atomics.compareExchange(ta, id, 1, -1) == 1) {
97          // Worker is finished.
98          assertEquals(id, workers[id].getMessage());
99          workers[id].terminate();
100          count++;
101        }
102      }
103    }
104  })();
105
106}
107