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Serenity Operating System
1/*
2 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Process.h>
8#include <Kernel/Scheduler.h>
9#include <Kernel/Sections.h>
10#include <Kernel/Tasks/FinalizerTask.h>
11
12namespace Kernel {
13
14static constexpr StringView finalizer_task_name = "Finalizer Task"sv;
15
16static void finalizer_task(void*)
17{
18 Thread::current()->set_priority(THREAD_PRIORITY_LOW);
19 for (;;) {
20 // The order of this if-else is important: We want to continue trying to finalize the threads in case
21 // Thread::finalize_dying_threads set g_finalizer_has_work back to true due to OOM conditions
22 if (g_finalizer_has_work.exchange(false, AK::MemoryOrder::memory_order_acq_rel) == true)
23 Thread::finalize_dying_threads();
24 else
25 g_finalizer_wait_queue->wait_forever(finalizer_task_name);
26 }
27};
28
29UNMAP_AFTER_INIT void FinalizerTask::spawn()
30{
31 LockRefPtr<Thread> finalizer_thread;
32 auto finalizer_process = Process::create_kernel_process(finalizer_thread, KString::must_create(finalizer_task_name), finalizer_task, nullptr);
33 VERIFY(finalizer_process);
34 g_finalizer = finalizer_thread;
35}
36
37}