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691b6f69c5
The LOCKER() macro appears to have been added to LibThread as a userspace analog to the previous LOCKER() macro that existed in the kernel. The kernel version used the macro to inject __FILE__ and __LINE__ number into the lock acquisition for debugging. However AK::SourceLocation was used to remove the need for the macro. So the kernel version no longer exists. The LOCKER() in LibThread doesn't appear to actually need to be a macro, using the type directly works fine, and arguably is more readable as it removes an unnecessary level of indirection.
77 lines
2 KiB
C++
77 lines
2 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/Queue.h>
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#include <LibCore/Event.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/Object.h>
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#include <LibThread/Lock.h>
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#include <LibThread/Thread.h>
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namespace LibThread {
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template<typename Result>
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class BackgroundAction;
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class BackgroundActionBase {
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template<typename Result>
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friend class BackgroundAction;
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private:
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BackgroundActionBase() { }
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static Lockable<Queue<Function<void()>>>& all_actions();
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static Thread& background_thread();
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};
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template<typename Result>
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class BackgroundAction final : public Core::Object
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, private BackgroundActionBase {
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C_OBJECT(BackgroundAction);
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public:
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static NonnullRefPtr<BackgroundAction<Result>> create(
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Function<Result()> action,
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Function<void(Result)> on_complete = nullptr)
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{
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return adopt_ref(*new BackgroundAction(move(action), move(on_complete)));
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}
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virtual ~BackgroundAction() { }
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private:
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BackgroundAction(Function<Result()> action, Function<void(Result)> on_complete)
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: Core::Object(&background_thread())
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, m_action(move(action))
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, m_on_complete(move(on_complete))
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{
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Locker locker(all_actions().lock());
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all_actions().resource().enqueue([this] {
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m_result = m_action();
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if (m_on_complete) {
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Core::EventLoop::current().post_event(*this, make<Core::DeferredInvocationEvent>([this](auto&) {
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m_on_complete(m_result.release_value());
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this->remove_from_parent();
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}));
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Core::EventLoop::wake();
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} else {
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this->remove_from_parent();
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}
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});
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}
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Function<Result()> m_action;
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Function<void(Result)> m_on_complete;
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Optional<Result> m_result;
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};
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}
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