mirror of
https://github.com/Atmosphere-NX/Atmosphere
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86 lines
2.9 KiB
C++
86 lines
2.9 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_select_cpu.hpp>
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#include <mesosphere/kern_k_light_lock.hpp>
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#include <mesosphere/kern_k_thread_queue.hpp>
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#include <mesosphere/kern_k_scoped_scheduler_lock_and_sleep.hpp>
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namespace ams::kern {
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class KLightConditionVariable {
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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 KLightConditionVariable() : m_wait_list() { /* ... */ }
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private:
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void WaitImpl(KLightLock *lock, s64 timeout, bool allow_terminating_thread) {
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KThread *owner = GetCurrentThreadPointer();
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KHardwareTimer *timer;
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/* Sleep the thread. */
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{
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KScopedSchedulerLockAndSleep lk(&timer, owner, timeout);
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if (!allow_terminating_thread && owner->IsTerminationRequested()) {
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lk.CancelSleep();
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return;
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}
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lock->Unlock();
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/* Set the thread as waiting. */
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GetCurrentThread().SetState(KThread::ThreadState_Waiting);
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/* Add the thread to the queue. */
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m_wait_list.push_back(GetCurrentThread());
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}
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/* Remove the thread from the wait list. */
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{
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KScopedSchedulerLock sl;
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m_wait_list.erase(m_wait_list.iterator_to(GetCurrentThread()));
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}
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/* Cancel the task that the sleep setup. */
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if (timer != nullptr) {
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timer->CancelTask(owner);
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}
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/* Re-acquire the lock. */
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lock->Lock();
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}
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public:
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void Wait(KLightLock *lock, s64 timeout = -1ll, bool allow_terminating_thread = true) {
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this->WaitImpl(lock, timeout, allow_terminating_thread);
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}
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void Broadcast() {
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KScopedSchedulerLock lk;
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/* Signal all threads. */
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for (auto &thread : m_wait_list) {
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thread.SetState(KThread::ThreadState_Runnable);
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}
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}
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};
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}
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