mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-24 04:42:11 +00:00
132 lines
5 KiB
C++
132 lines
5 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#pragma once
|
|
#include <mesosphere/kern_common.hpp>
|
|
#include <mesosphere/kern_k_thread.hpp>
|
|
|
|
namespace ams::kern {
|
|
|
|
class KThreadQueue {
|
|
private:
|
|
using Entry = KThread::QueueEntry;
|
|
private:
|
|
Entry root;
|
|
public:
|
|
constexpr ALWAYS_INLINE KThreadQueue() : root() { /* ... */ }
|
|
|
|
constexpr ALWAYS_INLINE bool IsEmpty() const { return this->root.GetNext() == nullptr; }
|
|
|
|
constexpr ALWAYS_INLINE KThread *GetFront() const { return this->root.GetNext(); }
|
|
constexpr ALWAYS_INLINE KThread *GetNext(KThread *t) const { return t->GetSleepingQueueEntry().GetNext(); }
|
|
private:
|
|
constexpr ALWAYS_INLINE KThread *GetBack() const { return this->root.GetPrev(); }
|
|
|
|
constexpr ALWAYS_INLINE void Enqueue(KThread *add) {
|
|
/* Get the entry associated with the added thread. */
|
|
Entry &add_entry = add->GetSleepingQueueEntry();
|
|
|
|
/* Get the entry associated with the end of the queue. */
|
|
KThread *tail = this->GetBack();
|
|
Entry &tail_entry = (tail != nullptr) ? tail->GetSleepingQueueEntry() : this->root;
|
|
|
|
/* Link the entries. */
|
|
add_entry.SetPrev(tail);
|
|
add_entry.SetNext(nullptr);
|
|
tail_entry.SetNext(add);
|
|
this->root.SetPrev(add);
|
|
}
|
|
|
|
constexpr ALWAYS_INLINE void Remove(KThread *remove) {
|
|
/* Get the entry associated with the thread. */
|
|
Entry &remove_entry = remove->GetSleepingQueueEntry();
|
|
|
|
/* Get the entries associated with next and prev. */
|
|
KThread *prev = remove_entry.GetPrev();
|
|
KThread *next = remove_entry.GetNext();
|
|
Entry &prev_entry = (prev != nullptr) ? prev->GetSleepingQueueEntry() : this->root;
|
|
Entry &next_entry = (next != nullptr) ? next->GetSleepingQueueEntry() : this->root;
|
|
|
|
/* Unlink. */
|
|
prev_entry.SetNext(next);
|
|
next_entry.SetPrev(prev);
|
|
}
|
|
public:
|
|
constexpr ALWAYS_INLINE void Dequeue() {
|
|
/* Get the front of the queue. */
|
|
KThread *head = this->GetFront();
|
|
if (head == nullptr) {
|
|
return;
|
|
}
|
|
|
|
MESOSPHERE_ASSERT(head->GetState() == KThread::ThreadState_Waiting);
|
|
|
|
/* Get the entry for the next head. */
|
|
KThread *next = GetNext(head);
|
|
Entry &next_entry = (next != nullptr) ? next->GetSleepingQueueEntry() : this->root;
|
|
|
|
/* Link the entries. */
|
|
this->root.SetNext(next);
|
|
next_entry.SetPrev(nullptr);
|
|
|
|
/* Clear the head's queue. */
|
|
head->SetSleepingQueue(nullptr);
|
|
}
|
|
|
|
bool SleepThread(KThread *t) {
|
|
/* Set the thread's queue and mark it as waiting. */
|
|
t->SetSleepingQueue(this);
|
|
t->SetState(KThread::ThreadState_Waiting);
|
|
|
|
/* Add the thread to the queue. */
|
|
this->Enqueue(t);
|
|
|
|
/* If the thread needs terminating, undo our work. */
|
|
if (t->IsTerminationRequested()) {
|
|
this->WakeupThread(t);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void WakeupThread(KThread *t) {
|
|
MESOSPHERE_ASSERT(t->GetState() == KThread::ThreadState_Waiting);
|
|
|
|
/* Remove the thread from the queue. */
|
|
this->Remove(t);
|
|
|
|
/* Mark the thread as no longer sleeping. */
|
|
t->SetState(KThread::ThreadState_Runnable);
|
|
t->SetSleepingQueue(nullptr);
|
|
}
|
|
|
|
KThread *WakeupFrontThread() {
|
|
KThread *front = this->GetFront();
|
|
if (front != nullptr) {
|
|
MESOSPHERE_ASSERT(front->GetState() == KThread::ThreadState_Waiting);
|
|
|
|
/* Remove the thread from the queue. */
|
|
this->Dequeue();
|
|
|
|
/* Mark the thread as no longer sleeping. */
|
|
front->SetState(KThread::ThreadState_Runnable);
|
|
front->SetSleepingQueue(nullptr);
|
|
}
|
|
return front;
|
|
}
|
|
};
|
|
|
|
}
|