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/*
* Copyright (c) 2020, The SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Atomic.h>
#include <Kernel/SpinLock.h>
#include <Kernel/Thread.h>
namespace Kernel {
class WaitQueue : public Thread::BlockCondition {
public:
u32 wake_one();
u32 wake_n(u32 wake_count);
u32 wake_all();
void should_block(bool block)
{
ScopedSpinLock lock(m_lock);
m_should_block = block;
}
template<class... Args>
Thread::BlockResult wait_on(const Thread::BlockTimeout& timeout, Args&&... args)
{
return Thread::current()->block<Thread::QueueBlocker>(timeout, *this, forward<Args>(args)...);
}
template<class... Args>
void wait_forever(Args&&... args)
{
(void)Thread::current()->block<Thread::QueueBlocker>({}, *this, forward<Args>(args)...);
}
protected:
virtual bool should_add_blocker(Thread::Blocker& b, void* data) override;
private:
bool m_wake_requested { false };
bool m_should_block { true };
};
}
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