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/*
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Error.h>
#include <AK/IntrusiveList.h>
#include <Kernel/Forward.h>
#include <Kernel/Locking/SpinlockProtected.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
extern WorkQueue* g_io_work;
extern WorkQueue* g_ata_work;
class WorkQueue {
AK_MAKE_NONCOPYABLE(WorkQueue);
AK_MAKE_NONMOVABLE(WorkQueue);
public:
static void initialize();
ErrorOr<void> try_queue(void (*function)(void*), void* data = nullptr, void (*free_data)(void*) = nullptr)
{
auto item = new (nothrow) WorkItem; // TODO: use a pool
if (!item)
return Error::from_errno(ENOMEM);
item->function = [function, data, free_data] {
function(data);
if (free_data)
free_data(data);
};
do_queue(*item);
return {};
}
template<typename Function>
ErrorOr<void> try_queue(Function function)
{
auto item = new (nothrow) WorkItem; // TODO: use a pool
if (!item)
return Error::from_errno(ENOMEM);
item->function = Function(function);
do_queue(*item);
return {};
}
private:
explicit WorkQueue(StringView);
struct WorkItem {
public:
IntrusiveListNode<WorkItem> m_node;
Function<void()> function;
};
void do_queue(WorkItem&);
RefPtr<Thread> m_thread;
WaitQueue m_wait_queue;
SpinlockProtected<IntrusiveList<&WorkItem::m_node>, LockRank::None> m_items {};
};
}
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