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ddd79fe2cf
In preparation for marking BlockingResult [[nodiscard]], there are a few places that perform infinite waits, which we never observe the result of the wait. Instead of suppressing them, add an alternate function which returns void when performing and infinite wait.
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020, The SerenityOS developers.
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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 <Kernel/SpinLock.h>
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#include <Kernel/Thread.h>
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namespace Kernel {
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class WaitQueue : public Thread::BlockCondition {
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public:
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u32 wake_one();
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u32 wake_n(u32 wake_count);
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u32 wake_all();
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void should_block(bool block)
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{
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ScopedSpinLock lock(m_lock);
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m_should_block = block;
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}
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template<class... Args>
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Thread::BlockResult wait_on(const Thread::BlockTimeout& timeout, Args&&... args)
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{
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return Thread::current()->block<Thread::QueueBlocker>(timeout, *this, forward<Args>(args)...);
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}
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template<class... Args>
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void wait_forever(Args&&... args)
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{
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(void)Thread::current()->block<Thread::QueueBlocker>({}, *this, forward<Args>(args)...);
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}
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protected:
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virtual bool should_add_blocker(Thread::Blocker& b, void* data) override;
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private:
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bool m_wake_requested { false };
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bool m_should_block { true };
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};
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}
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