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021fb3ea05
Since we never check a kernel process's state like a userland process, it's possible for a kernel process to ignore the fact that someone is trying to kill it, and continue running. This is not desireable if we want to properly shutdown all processes, including Kernel ones.
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Sections.h>
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#include <Kernel/Tasks/FinalizerTask.h>
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#include <Kernel/Tasks/Process.h>
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#include <Kernel/Tasks/Scheduler.h>
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namespace Kernel {
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static constexpr StringView finalizer_task_name = "Finalizer Task"sv;
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static void finalizer_task(void*)
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{
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Thread::current()->set_priority(THREAD_PRIORITY_LOW);
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while (!Process::current().is_dying()) {
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// The order of this if-else is important: We want to continue trying to finalize the threads in case
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// Thread::finalize_dying_threads set g_finalizer_has_work back to true due to OOM conditions
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if (g_finalizer_has_work.exchange(false, AK::MemoryOrder::memory_order_acq_rel) == true)
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Thread::finalize_dying_threads();
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else
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g_finalizer_wait_queue->wait_forever(finalizer_task_name);
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}
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Process::current().sys$exit(0);
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VERIFY_NOT_REACHED();
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}
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UNMAP_AFTER_INIT void FinalizerTask::spawn()
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{
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auto [_, finalizer_thread] = MUST(Process::create_kernel_process(KString::must_create(finalizer_task_name), finalizer_task, nullptr));
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g_finalizer = move(finalizer_thread);
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}
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}
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