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https://github.com/Atmosphere-NX/Atmosphere.git
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92 lines
3.1 KiB
C++
92 lines
3.1 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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#include <mesosphere.hpp>
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namespace ams::kern {
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void KWaitObject::OnTimer() {
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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/* Wake up all the waiting threads. */
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for (KThread &thread : this->wait_list) {
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thread.Wakeup();
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}
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}
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Result KWaitObject::Synchronize(s64 timeout) {
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/* Perform the wait. */
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KHardwareTimer *timer = nullptr;
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KThread *cur_thread = GetCurrentThreadPointer();
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{
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KScopedSchedulerLock sl;
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/* Check that the thread isn't terminating. */
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R_UNLESS(!cur_thread->IsTerminationRequested(), svc::ResultTerminationRequested());
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/* Verify that nothing else is already waiting on the object. */
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if (timeout > 0) {
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R_UNLESS(!this->timer_used, svc::ResultBusy());
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}
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/* Check that we're not already in use. */
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if (timeout >= 0) {
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/* Verify the timer isn't already in use. */
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R_UNLESS(!this->timer_used, svc::ResultBusy());
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}
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/* If we need to, register our timeout. */
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if (timeout > 0) {
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/* Mark that we're using the timer. */
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this->timer_used = true;
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/* Use the timer. */
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timer = std::addressof(Kernel::GetHardwareTimer());
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timer->RegisterAbsoluteTask(this, timeout);
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}
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if (timeout == 0) {
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/* If we're timed out immediately, just wake up the thread. */
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this->OnTimer();
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} else {
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/* Otherwise, sleep until the timeout occurs. */
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this->wait_list.push_back(GetCurrentThread());
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cur_thread->SetState(KThread::ThreadState_Waiting);
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cur_thread->SetSyncedObject(nullptr, svc::ResultTimedOut());
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}
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}
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/* Cleanup as necessary. */
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{
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KScopedSchedulerLock sl;
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/* Remove from the timer. */
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if (timeout > 0) {
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MESOSPHERE_ASSERT(this->timer_used);
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MESOSPHERE_ASSERT(timer != nullptr);
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timer->CancelTask(this);
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this->timer_used = false;
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}
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/* Remove the thread from our queue. */
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if (timeout != 0) {
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this->wait_list.erase(this->wait_list.iterator_to(GetCurrentThread()));
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}
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}
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return ResultSuccess();
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}
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}
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