1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "JSRunLoopTimer.h"
29#include "Strong.h"
30
31#include <wtf/HashMap.h>
32#include <wtf/Lock.h>
33#include <wtf/Vector.h>
34
35namespace JSC {
36
37class JSPromise;
38class VM;
39class JSCell;
40
41class PromiseTimer : public JSRunLoopTimer {
42public:
43 using Base = JSRunLoopTimer;
44
45 void doWork(VM&) override;
46
47 void addPendingPromise(VM&, JSPromise*, Vector<Strong<JSCell>>&& dependencies);
48 JS_EXPORT_PRIVATE bool hasPendingPromise(JSPromise* ticket);
49 JS_EXPORT_PRIVATE bool hasDependancyInPendingPromise(JSPromise* ticket, JSCell* dependency);
50 // JSPromise should handle canceling when the promise is resolved or rejected.
51 bool cancelPendingPromise(JSPromise*);
52
53 using Task = Function<void()>;
54 void scheduleWorkSoon(JSPromise*, Task&&);
55
56 void stopRunningTasks() { m_runTasks = false; }
57
58 JS_EXPORT_PRIVATE void runRunLoop();
59
60 static Ref<PromiseTimer> create(VM& vm)
61 {
62 return adoptRef(*new PromiseTimer(vm));
63 }
64
65private:
66 PromiseTimer(VM&);
67
68 HashMap<JSPromise*, Vector<Strong<JSCell>>> m_pendingPromises;
69 Lock m_taskLock;
70 bool m_runTasks { true };
71 bool m_shouldStopRunLoopWhenAllPromisesFinish { false };
72 bool m_currentlyRunningTask { false };
73 Vector<std::tuple<JSPromise*, Task>> m_tasks;
74};
75
76} // namespace JSC
77