mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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276 lines
10 KiB
C++
276 lines
10 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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ALWAYS_INLINE bool ReadFromUser(u32 *out, KProcessAddress address) {
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return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
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}
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ALWAYS_INLINE bool WriteToUser(KProcessAddress address, const u32 *p) {
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return UserspaceAccess::CopyMemoryToUserSize32Bit(GetVoidPointer(address), p);
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}
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ALWAYS_INLINE bool UpdateLockAtomic(u32 *out, KProcessAddress address, u32 if_zero, u32 new_orr_mask) {
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return UserspaceAccess::UpdateLockAtomic(out, GetPointer<u32>(address), if_zero, new_orr_mask);
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}
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}
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Result KConditionVariable::SignalToAddress(KProcessAddress addr) {
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KThread *owner_thread = std::addressof(GetCurrentThread());
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/* Signal the address. */
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{
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KScopedSchedulerLock sl;
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/* Remove waiter thread. */
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s32 num_waiters;
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KThread *next_owner_thread = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
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/* Determine the next tag. */
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u32 next_value = 0;
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if (next_owner_thread) {
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next_value = next_owner_thread->GetAddressKeyValue();
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if (num_waiters > 1) {
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next_value |= ams::svc::HandleWaitMask;
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}
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next_owner_thread->SetSyncedObject(nullptr, ResultSuccess());
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next_owner_thread->Wakeup();
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}
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/* Write the value to userspace. */
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if (!WriteToUser(addr, std::addressof(next_value))) {
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if (next_owner_thread) {
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next_owner_thread->SetSyncedObject(nullptr, svc::ResultInvalidCurrentMemory());
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}
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return svc::ResultInvalidCurrentMemory();
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}
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}
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return ResultSuccess();
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}
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Result KConditionVariable::WaitForAddress(ams::svc::Handle handle, KProcessAddress addr, u32 value) {
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KThread *cur_thread = std::addressof(GetCurrentThread());
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/* Wait for the address. */
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{
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KScopedAutoObject<KThread> owner_thread;
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MESOSPHERE_ASSERT(owner_thread.IsNull());
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{
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KScopedSchedulerLock sl;
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cur_thread->SetSyncedObject(nullptr, ResultSuccess());
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/* Check if the thread should terminate. */
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R_UNLESS(!cur_thread->IsTerminationRequested(), svc::ResultTerminationRequested());
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{
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/* Read the tag from userspace. */
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u32 test_tag;
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R_UNLESS(ReadFromUser(std::addressof(test_tag), addr), svc::ResultInvalidCurrentMemory());
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/* If the tag isn't the handle (with wait mask), we're done. */
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R_SUCCEED_IF(test_tag != (handle | ams::svc::HandleWaitMask));
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/* Get the lock owner thread. */
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owner_thread = GetCurrentProcess().GetHandleTable().GetObjectWithoutPseudoHandle<KThread>(handle);
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R_UNLESS(owner_thread.IsNotNull(), svc::ResultInvalidHandle());
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/* Update the lock. */
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cur_thread->SetAddressKey(addr, value);
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owner_thread->AddWaiter(cur_thread);
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cur_thread->SetState(KThread::ThreadState_Waiting);
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}
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}
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MESOSPHERE_ASSERT(owner_thread.IsNotNull());
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/* Remove the thread as a waiter from the lock owner. */
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{
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KScopedSchedulerLock sl;
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if (KThread *mutex_owner = cur_thread->GetLockOwner(); mutex_owner != nullptr) {
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mutex_owner->RemoveWaiter(cur_thread);
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}
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}
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}
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/* Get the wait 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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void KConditionVariable::SignalImpl(KThread *thread) {
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/* Check pre-conditions. */
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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/* Update the tag. */
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KProcessAddress address = thread->GetAddressKey();
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u32 own_tag = thread->GetAddressKeyValue();
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u32 prev_tag;
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bool can_access;
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{
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KScopedInterruptDisable di;
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can_access = cpu::CanAccessAtomic(address);
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if (AMS_LIKELY(can_access)) {
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can_access = UpdateLockAtomic(std::addressof(prev_tag), address, own_tag, ams::svc::HandleWaitMask);
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}
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}
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if (AMS_LIKELY(can_access)) {
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if (prev_tag == ams::svc::InvalidHandle) {
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/* If nobody held the lock previously, we're all good. */
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thread->SetSyncedObject(nullptr, ResultSuccess());
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thread->Wakeup();
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} else {
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/* Get the previous owner. */
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KThread *owner_thread = GetCurrentProcess().GetHandleTable().GetObjectWithoutPseudoHandle<KThread>(static_cast<ams::svc::Handle>(prev_tag & ~ams::svc::HandleWaitMask))
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.ReleasePointerUnsafe();
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if (AMS_LIKELY(owner_thread != nullptr)) {
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/* Add the thread as a waiter on the owner. */
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owner_thread->AddWaiter(thread);
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owner_thread->Close();
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} else {
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/* The lock was tagged with a thread that doesn't exist. */
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thread->SetSyncedObject(nullptr, svc::ResultInvalidState());
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thread->Wakeup();
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}
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}
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} else {
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/* If the address wasn't accessible, note so. */
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thread->SetSyncedObject(nullptr, svc::ResultInvalidCurrentMemory());
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thread->Wakeup();
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}
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}
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void KConditionVariable::Signal(uintptr_t cv_key, s32 count) {
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/* Perform signaling. */
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int num_waiters = 0;
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{
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KScopedSchedulerLock sl;
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auto it = m_tree.nfind_key({ cv_key, -1 });
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while ((it != m_tree.end()) && (count <= 0 || num_waiters < count) && (it->GetConditionVariableKey() == cv_key)) {
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KThread *target_thread = std::addressof(*it);
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this->SignalImpl(target_thread);
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it = m_tree.erase(it);
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target_thread->ClearConditionVariable();
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++num_waiters;
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}
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/* If we have no waiters, clear the has waiter flag. */
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if (it == m_tree.end() || it->GetConditionVariableKey() != cv_key) {
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const u32 has_waiter_flag = 0;
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WriteToUser(cv_key, std::addressof(has_waiter_flag));
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}
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}
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}
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Result KConditionVariable::Wait(KProcessAddress addr, uintptr_t key, u32 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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/* Set the synced object. */
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cur_thread->SetSyncedObject(nullptr, ams::svc::ResultTimedOut());
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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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/* Update the value and process for the next owner. */
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{
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/* Remove waiter thread. */
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s32 num_waiters;
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KThread *next_owner_thread = cur_thread->RemoveWaiterByKey(std::addressof(num_waiters), GetInteger(addr));
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/* Update for the next owner thread. */
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u32 next_value = 0;
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if (next_owner_thread != nullptr) {
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/* Get the next tag value. */
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next_value = next_owner_thread->GetAddressKeyValue();
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if (num_waiters > 1) {
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next_value |= ams::svc::HandleWaitMask;
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}
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/* Wake up the next owner. */
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next_owner_thread->SetSyncedObject(nullptr, ResultSuccess());
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next_owner_thread->Wakeup();
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}
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/* Write to the cv key. */
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{
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const u32 has_waiter_flag = 1;
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WriteToUser(key, std::addressof(has_waiter_flag));
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cpu::DataMemoryBarrier();
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}
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/* Write the value to userspace. */
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if (!WriteToUser(addr, std::addressof(next_value))) {
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slp.CancelSleep();
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return svc::ResultInvalidCurrentMemory();
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}
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}
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/* Update condition variable tracking. */
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{
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cur_thread->SetConditionVariable(std::addressof(m_tree), addr, key, value);
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m_tree.insert(*cur_thread);
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}
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/* If the timeout is non-zero, set the thread as waiting. */
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if (timeout != 0) {
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cur_thread->SetState(KThread::ThreadState_Waiting);
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}
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}
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/* Remove from the condition variable. */
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{
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KScopedSchedulerLock sl;
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if (KThread *owner = cur_thread->GetLockOwner(); owner != nullptr) {
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owner->RemoveWaiter(cur_thread);
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}
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if (cur_thread->IsWaitingForConditionVariable()) {
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m_tree.erase(m_tree.iterator_to(*cur_thread));
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cur_thread->ClearConditionVariable();
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}
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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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/* 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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