mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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109 lines
3.5 KiB
C++
109 lines
3.5 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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constinit KThread g_arbiter_compare_thread;
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ALWAYS_INLINE bool ReadFromUser(s32 *out, KProcessAddress address) {
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return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
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}
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}
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Result KAddressArbiter::Signal(uintptr_t addr, s32 count) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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Result KAddressArbiter::SignalAndIncrementIfEqual(uintptr_t addr, s32 value, s32 count) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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Result KAddressArbiter::SignalAndModifyByWaitingCountIfEqual(uintptr_t addr, s32 value, s32 count) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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Result KAddressArbiter::WaitIfLessThan(uintptr_t addr, s32 value, bool decrement, s64 timeout) {
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MESOSPHERE_UNIMPLEMENTED();
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}
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Result KAddressArbiter::WaitIfEqual(uintptr_t addr, s32 value, s64 timeout) {
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/* Prepare to wait. */
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KThread *cur_thread = GetCurrentThreadPointer();
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KHardwareTimer *timer;
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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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/* Set the synced object. */
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cur_thread->SetSyncedObject(nullptr, ams::svc::ResultTimedOut());
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/* Read the value from userspace. */
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s32 user_value;
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if (!ReadFromUser(std::addressof(user_value), addr)) {
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slp.CancelSleep();
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return svc::ResultInvalidCurrentMemory();
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}
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/* Check that the value is equal. */
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if (value != user_value) {
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slp.CancelSleep();
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return svc::ResultInvalidState();
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}
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/* Check that the timeout is non-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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/* Set the arbiter. */
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cur_thread->SetAddressArbiter(std::addressof(this->tree), addr);
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this->tree.insert(*cur_thread);
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cur_thread->SetState(KThread::ThreadState_Waiting);
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}
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/* Cancel the timer wait. */
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if (timer != nullptr) {
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timer->CancelTask(cur_thread);
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}
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/* Remove from the address arbiter. */
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{
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KScopedSchedulerLock sl;
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if (cur_thread->IsWaitingForAddressArbiter()) {
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this->tree.erase(this->tree.iterator_to(*cur_thread));
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cur_thread->ClearAddressArbiter();
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}
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}
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/* Get the result. */
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KSynchronizationObject *dummy;
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return cur_thread->GetWaitResult(std::addressof(dummy));
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}
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}
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