1/*
2 * Copyright (C) 2017 Yusuke Suzuki <[email protected]>.
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 <memory>
29#include <wtf/ListHashSet.h>
30#include <wtf/Lock.h>
31#include <wtf/Threading.h>
32
33namespace WTF {
34
35enum class ThreadGroupAddResult { NewlyAdded, AlreadyAdded, NotAdded };
36
37class ThreadGroup : public std::enable_shared_from_this<ThreadGroup> {
38 WTF_MAKE_FAST_ALLOCATED;
39 WTF_MAKE_NONCOPYABLE(ThreadGroup);
40public:
41 friend class Thread;
42
43 static std::shared_ptr<ThreadGroup> create()
44 {
45 return std::make_shared<ThreadGroup>();
46 }
47
48 WTF_EXPORT_PRIVATE ThreadGroupAddResult add(Thread&);
49 WTF_EXPORT_PRIVATE ThreadGroupAddResult add(const AbstractLocker&, Thread&);
50 WTF_EXPORT_PRIVATE ThreadGroupAddResult addCurrentThread();
51
52 const ListHashSet<Ref<Thread>>& threads(const AbstractLocker&) const { return m_threads; }
53
54 WordLock& getLock() { return m_lock; }
55
56 WTF_EXPORT_PRIVATE ~ThreadGroup();
57
58 ThreadGroup() = default;
59
60private:
61 std::weak_ptr<ThreadGroup> weakFromThis()
62 {
63 return shared_from_this();
64 }
65
66 // We use WordLock since it can be used when deallocating TLS.
67 WordLock m_lock;
68 ListHashSet<Ref<Thread>> m_threads;
69};
70
71}
72
73using WTF::ThreadGroup;
74using WTF::ThreadGroupAddResult;
75