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https://github.com/Atmosphere-NX/Atmosphere.git
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102 lines
3.9 KiB
C++
102 lines
3.9 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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#include <mesosphere.hpp>
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namespace ams::kern {
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namespace {
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class ThreadQueueImplForKWaitObjectSynchronize final : public KThreadQueueWithoutEndWait {
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private:
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KThread::WaiterList *m_wait_list;
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KThread **m_thread;
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public:
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constexpr ThreadQueueImplForKWaitObjectSynchronize(KThread::WaiterList *wl, KThread **t) : KThreadQueueWithoutEndWait(), m_wait_list(wl), m_thread(t) { /* ... */ }
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virtual void CancelWait(KThread *waiting_thread, Result wait_result, bool cancel_timer_task) override {
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/* Remove the thread from the wait list. */
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m_wait_list->erase(m_wait_list->iterator_to(*waiting_thread));
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/* If the result was a timeout and the thread is our wait object thread, cancel recursively. */
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if (svc::ResultTimedOut::Includes(wait_result) && waiting_thread == *m_thread) {
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for (auto &thread : *m_wait_list) {
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thread.CancelWait(svc::ResultTimedOut(), false);
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}
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}
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/* If the thread is our wait object thread, clear it. */
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if (*m_thread == waiting_thread) {
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*m_thread = nullptr;
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}
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/* Invoke the base cancel wait handler. */
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KThreadQueue::CancelWait(waiting_thread, wait_result, cancel_timer_task);
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}
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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;
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KThread *cur_thread = GetCurrentThreadPointer();
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ThreadQueueImplForKWaitObjectSynchronize wait_queue(std::addressof(m_wait_list), std::addressof(m_next_thread));
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{
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KScopedSchedulerLockAndSleep slp(std::addressof(timer), cur_thread, timeout);
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/* Check that the thread isn't terminating. */
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if (cur_thread->IsTerminationRequested()) {
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slp.CancelSleep();
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return svc::ResultTerminationRequested();
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}
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/* Handle the case where timeout is non-negative/infinite. */
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if (timeout >= 0) {
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/* Check if we're already waiting. */
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if (m_next_thread != nullptr) {
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slp.CancelSleep();
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return svc::ResultBusy();
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}
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/* If timeout is zero, handle the special case by canceling all waiting threads. */
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if (timeout == 0) {
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for (auto &thread : m_wait_list) {
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thread.CancelWait(svc::ResultTimedOut(), false);
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}
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slp.CancelSleep();
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return ResultSuccess();
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}
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}
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/* If the timeout isn't infinite, register it as our next timeout. */
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if (timeout > 0) {
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wait_queue.SetHardwareTimer(timer);
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m_next_thread = cur_thread;
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}
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/* Add the current thread to our wait list. */
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m_wait_list.push_back(*cur_thread);
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/* Wait until the timeout occurs. */
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cur_thread->BeginWait(std::addressof(wait_queue));
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}
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return ResultSuccess();
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}
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}
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