mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <mesosphere/kern_common.hpp>
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#include <mesosphere/kern_k_thread.hpp>
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namespace ams::kern {
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class KThreadQueue {
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private:
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KThread::WaiterList m_wait_list;
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public:
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constexpr ALWAYS_INLINE KThreadQueue() : m_wait_list() { /* ... */ }
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bool IsEmpty() const { return m_wait_list.empty(); }
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KThread::WaiterList::iterator begin() { return m_wait_list.begin(); }
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KThread::WaiterList::iterator end() { return m_wait_list.end(); }
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bool SleepThread(KThread *t) {
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KScopedSchedulerLock sl;
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/* If the thread needs terminating, don't enqueue it. */
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if (t->IsTerminationRequested()) {
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return false;
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}
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/* Set the thread's queue and mark it as waiting. */
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t->SetSleepingQueue(this);
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t->SetState(KThread::ThreadState_Waiting);
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/* Add the thread to the queue. */
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m_wait_list.push_back(*t);
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return true;
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}
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void WakeupThread(KThread *t) {
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KScopedSchedulerLock sl;
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/* Remove the thread from the queue. */
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m_wait_list.erase(m_wait_list.iterator_to(*t));
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/* Mark the thread as no longer sleeping. */
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t->SetState(KThread::ThreadState_Runnable);
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t->SetSleepingQueue(nullptr);
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}
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KThread *WakeupFrontThread() {
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KScopedSchedulerLock sl;
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if (m_wait_list.empty()) {
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return nullptr;
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} else {
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/* Remove the thread from the queue. */
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auto it = m_wait_list.begin();
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KThread *thread = std::addressof(*it);
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m_wait_list.erase(it);
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MESOSPHERE_ASSERT(thread->GetState() == KThread::ThreadState_Waiting);
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/* Mark the thread as no longer sleeping. */
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thread->SetState(KThread::ThreadState_Runnable);
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thread->SetSleepingQueue(nullptr);
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return thread;
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}
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}
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};
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}
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