mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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139 lines
4.6 KiB
C++
139 lines
4.6 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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Result KSynchronization::Wait(s32 *out_index, KSynchronizationObject **objects, const s32 num_objects, s64 timeout) {
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MESOSPHERE_ASSERT_THIS();
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/* Allocate space on stack for thread iterators. */
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KSynchronizationObject::iterator *thread_iters = static_cast<KSynchronizationObject::iterator *>(__builtin_alloca(sizeof(KSynchronizationObject::iterator) * num_objects));
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/* Prepare for wait. */
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KThread *thread = GetCurrentThreadPointer();
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s32 sync_index = -1;
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KHardwareTimer *timer;
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{
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/* Setup the scheduling lock and sleep. */
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KScopedSchedulerLockAndSleep slp(std::addressof(timer), thread, timeout);
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/* Check if any of the objects are already signaled. */
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for (auto i = 0; i < num_objects; ++i) {
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AMS_ASSERT(objects[i] != nullptr);
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if (objects[i]->IsSignaled()) {
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*out_index = i;
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slp.CancelSleep();
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return ResultSuccess();
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}
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}
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/* Check if the timeout is zero. */
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if (timeout == 0) {
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slp.CancelSleep();
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return svc::ResultTimedOut();
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}
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/* Check if the thread should terminate. */
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if (thread->IsTerminationRequested()) {
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slp.CancelSleep();
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return svc::ResultTerminationRequested();
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}
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/* Check if waiting was canceled. */
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if (thread->IsWaitCancelled()) {
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slp.CancelSleep();
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thread->ClearWaitCancelled();
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return svc::ResultCancelled();
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}
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/* Add the waiters. */
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for (auto i = 0; i < num_objects; ++i) {
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thread_iters[i] = objects[i]->RegisterWaitingThread(thread);
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}
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/* Mark the thread as waiting. */
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thread->SetCancellable();
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thread->SetSyncedObject(nullptr, svc::ResultTimedOut());
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thread->SetState(KThread::ThreadState_Waiting);
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}
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/* The lock/sleep is done, so we should be able to get our result. */
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/* Thread is no longer cancellable. */
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thread->ClearCancellable();
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/* Cancel the timer as needed. */
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if (timer != nullptr) {
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timer->CancelTask(thread);
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}
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/* Get the wait result. */
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Result wait_result;
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{
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KScopedSchedulerLock lk;
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KSynchronizationObject *synced_obj;
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wait_result = thread->GetWaitResult(std::addressof(synced_obj));
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for (auto i = 0; i < num_objects; ++i) {
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objects[i]->UnregisterWaitingThread(thread_iters[i]);
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if (objects[i] == synced_obj) {
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sync_index = i;
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}
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}
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}
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/* Set output. */
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*out_index = sync_index;
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return wait_result;
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}
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void KSynchronization::OnAvailable(KSynchronizationObject *object) {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock sl;
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/* If we're not signaled, we've nothing to notify. */
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if (!object->IsSignaled()) {
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return;
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}
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/* Iterate over each thread. */
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for (auto &thread : *object) {
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if (thread.GetState() == KThread::ThreadState_Waiting) {
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thread.SetSyncedObject(object, ResultSuccess());
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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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void KSynchronization::OnAbort(KSynchronizationObject *object, Result abort_reason) {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock sl;
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/* Iterate over each thread. */
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for (auto &thread : *object) {
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if (thread.GetState() == KThread::ThreadState_Waiting) {
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thread.SetSyncedObject(object, abort_reason);
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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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