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Serenity Operating System
1/*
2 * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <LibThread/BackgroundAction.h>
28#include <LibThread/Thread.h>
29#include <LibThread/Lock.h>
30#include <AK/Queue.h>
31
32static LibThread::Lockable<Queue<Function<void()>>>* s_all_actions;
33static LibThread::Thread* s_background_thread;
34
35static int background_thread_func()
36{
37 while (true) {
38 Function<void()> work_item;
39 {
40 LOCKER(s_all_actions->lock());
41
42 if (!s_all_actions->resource().is_empty())
43 work_item = s_all_actions->resource().dequeue();
44 }
45 if (work_item)
46 work_item();
47 else
48 sleep(1);
49 }
50
51 ASSERT_NOT_REACHED();
52}
53
54static void init()
55{
56 s_all_actions = new LibThread::Lockable<Queue<Function<void()>>>();
57 s_background_thread = &LibThread::Thread::construct(background_thread_func).leak_ref();
58 s_background_thread->set_name("Background thread");
59 s_background_thread->start();
60}
61
62LibThread::Lockable<Queue<Function<void()>>>& LibThread::BackgroundActionBase::all_actions()
63{
64 if (s_all_actions == nullptr)
65 init();
66 return *s_all_actions;
67}
68
69LibThread::Thread& LibThread::BackgroundActionBase::background_thread()
70{
71 if (s_background_thread == nullptr)
72 init();
73 return *s_background_thread;
74}