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41d2a0e9f7
If a thread is waiting but getting killed, we need to dequeue the thread from the WaitQueue so that a potential wake before finalization doesn't happen.
56 lines
2 KiB
C++
56 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Atomic.h>
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#include <AK/SinglyLinkedList.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/Thread.h>
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namespace Kernel {
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class WaitQueue {
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public:
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WaitQueue();
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~WaitQueue();
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SpinLock<u32>& get_lock() { return m_lock; }
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bool enqueue(Thread&);
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bool dequeue(Thread&);
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void wake_one(Atomic<bool>* lock = nullptr);
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void wake_n(u32 wake_count);
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void wake_all();
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void clear();
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private:
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typedef IntrusiveList<Thread, &Thread::m_wait_queue_node> ThreadList;
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ThreadList m_threads;
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SpinLock<u32> m_lock;
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bool m_wake_requested { false };
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};
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}
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