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https://github.com/Atmosphere-NX/Atmosphere.git
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132 lines
5 KiB
C++
132 lines
5 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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using Entry = KThread::QueueEntry;
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private:
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Entry root;
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public:
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constexpr ALWAYS_INLINE KThreadQueue() : root() { /* ... */ }
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constexpr ALWAYS_INLINE bool IsEmpty() const { return this->root.GetNext() == nullptr; }
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constexpr ALWAYS_INLINE KThread *GetFront() const { return this->root.GetNext(); }
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constexpr ALWAYS_INLINE KThread *GetNext(KThread *t) const { return t->GetSleepingQueueEntry().GetNext(); }
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private:
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constexpr ALWAYS_INLINE KThread *GetBack() const { return this->root.GetPrev(); }
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constexpr ALWAYS_INLINE void Enqueue(KThread *add) {
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/* Get the entry associated with the added thread. */
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Entry &add_entry = add->GetSleepingQueueEntry();
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/* Get the entry associated with the end of the queue. */
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KThread *tail = this->GetBack();
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Entry &tail_entry = (tail != nullptr) ? tail->GetSleepingQueueEntry() : this->root;
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/* Link the entries. */
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add_entry.SetPrev(tail);
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add_entry.SetNext(nullptr);
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tail_entry.SetNext(add);
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this->root.SetPrev(add);
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}
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constexpr ALWAYS_INLINE void Remove(KThread *remove) {
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/* Get the entry associated with the thread. */
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Entry &remove_entry = remove->GetSleepingQueueEntry();
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/* Get the entries associated with next and prev. */
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KThread *prev = remove_entry.GetPrev();
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KThread *next = remove_entry.GetNext();
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Entry &prev_entry = (prev != nullptr) ? prev->GetSleepingQueueEntry() : this->root;
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Entry &next_entry = (next != nullptr) ? next->GetSleepingQueueEntry() : this->root;
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/* Unlink. */
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prev_entry.SetNext(next);
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next_entry.SetPrev(prev);
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}
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public:
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constexpr ALWAYS_INLINE void Dequeue() {
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/* Get the front of the queue. */
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KThread *head = this->GetFront();
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if (head == nullptr) {
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return;
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}
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MESOSPHERE_ASSERT(head->GetState() == KThread::ThreadState_Waiting);
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/* Get the entry for the next head. */
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KThread *next = GetNext(head);
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Entry &next_entry = (next != nullptr) ? next->GetSleepingQueueEntry() : this->root;
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/* Link the entries. */
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this->root.SetNext(next);
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next_entry.SetPrev(nullptr);
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/* Clear the head's queue. */
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head->SetSleepingQueue(nullptr);
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}
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bool SleepThread(KThread *t) {
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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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this->Enqueue(t);
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/* If the thread needs terminating, undo our work. */
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if (t->IsTerminationRequested()) {
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this->WakeupThread(t);
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return false;
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}
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return true;
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}
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void WakeupThread(KThread *t) {
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MESOSPHERE_ASSERT(t->GetState() == KThread::ThreadState_Waiting);
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/* Remove the thread from the queue. */
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this->Remove(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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KThread *front = this->GetFront();
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if (front != nullptr) {
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MESOSPHERE_ASSERT(front->GetState() == KThread::ThreadState_Waiting);
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/* Remove the thread from the queue. */
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this->Dequeue();
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/* Mark the thread as no longer sleeping. */
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front->SetState(KThread::ThreadState_Runnable);
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front->SetSleepingQueue(nullptr);
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}
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return front;
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}
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};
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}
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