Atmosphere/libraries/libmesosphere/source/kern_k_interrupt_task_manager.cpp

97 lines
3.1 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/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
void KInterruptTaskManager::TaskQueue::Enqueue(KInterruptTask *task) {
MESOSPHERE_ASSERT(task->GetNextTask() == nullptr);
MESOSPHERE_ASSERT(task != this->head);
MESOSPHERE_ASSERT(task != this->tail);
/* Insert the task into the queue. */
if (this->tail != nullptr) {
this->tail->SetNextTask(task);
} else {
this->head = task;
}
this->tail = task;
}
void KInterruptTaskManager::TaskQueue::Dequeue() {
MESOSPHERE_ASSERT(this->head != nullptr);
MESOSPHERE_ASSERT(this->tail != nullptr);
/* Pop the task from the front of the queue. */
if (this->head == this->tail) {
this->head = nullptr;
this->tail = nullptr;
} else {
this->head = this->head->GetNextTask();
}
}
void KInterruptTaskManager::ThreadFunction(uintptr_t arg) {
reinterpret_cast<KInterruptTaskManager *>(arg)->ThreadFunctionImpl();
}
void KInterruptTaskManager::ThreadFunctionImpl() {
MESOSPHERE_ASSERT_THIS();
while (true) {
/* Get a task. */
KInterruptTask *task = nullptr;
{
KScopedInterruptDisable di;
task = this->task_queue.GetHead();
if (task == nullptr) {
this->thread->SetState(KThread::ThreadState_Waiting);
continue;
}
this->task_queue.Dequeue();
}
/* Do the task. */
task->DoTask();
}
}
void KInterruptTaskManager::Initialize() {
/* Reserve a thread from the system limit. */
MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_ThreadCountMax, 1));
/* Create and initialize the thread. */
this->thread = KThread::Create();
MESOSPHERE_ABORT_UNLESS(this->thread != nullptr);
MESOSPHERE_R_ABORT_UNLESS(KThread::InitializeHighPriorityThread(this->thread, ThreadFunction, reinterpret_cast<uintptr_t>(this)));
KThread::Register(this->thread);
/* Run the thread. */
this->thread->Run();
}
void KInterruptTaskManager::EnqueueTask(KInterruptTask *task) {
MESOSPHERE_ASSERT(!KInterruptManager::AreInterruptsEnabled());
/* Enqueue the task and signal the scheduler. */
this->task_queue.Enqueue(task);
Kernel::GetScheduler().SetInterruptTaskRunnable();
}
}