mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-23 10:52:13 +00:00
303 lines
11 KiB
C++
303 lines
11 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <mesosphere.hpp>
|
|
|
|
namespace ams::kern {
|
|
|
|
namespace {
|
|
|
|
ALWAYS_INLINE bool ReadFromUser(u32 *out, KProcessAddress address) {
|
|
return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
|
|
}
|
|
|
|
ALWAYS_INLINE bool WriteToUser(KProcessAddress address, const u32 *p) {
|
|
return UserspaceAccess::CopyMemoryToUserSize32Bit(GetVoidPointer(address), p);
|
|
}
|
|
|
|
ALWAYS_INLINE bool UpdateLockAtomic(u32 *out, KProcessAddress address, u32 if_zero, u32 new_orr_mask) {
|
|
return UserspaceAccess::UpdateLockAtomic(out, GetPointer<u32>(address), if_zero, new_orr_mask);
|
|
}
|
|
|
|
}
|
|
|
|
Result KConditionVariable::SignalToAddress(KProcessAddress addr) {
|
|
KThread *owner_thread = std::addressof(GetCurrentThread());
|
|
|
|
/* Signal the address. */
|
|
{
|
|
KScopedSchedulerLock sl;
|
|
|
|
/* Remove waiter thread. */
|
|
s32 num_waiters;
|
|
KThread *next_owner_thread = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
|
|
|
|
/* Determine the next tag. */
|
|
u32 next_value = 0;
|
|
if (next_owner_thread) {
|
|
next_value = next_owner_thread->GetAddressKeyValue();
|
|
if (num_waiters > 1) {
|
|
next_value |= ams::svc::HandleWaitMask;
|
|
}
|
|
|
|
next_owner_thread->SetSyncedObject(nullptr, ResultSuccess());
|
|
next_owner_thread->Wakeup();
|
|
}
|
|
|
|
/* Write the value to userspace. */
|
|
if (!WriteToUser(addr, std::addressof(next_value))) {
|
|
if (next_owner_thread) {
|
|
next_owner_thread->SetSyncedObject(nullptr, svc::ResultInvalidCurrentMemory());
|
|
}
|
|
|
|
return svc::ResultInvalidCurrentMemory();
|
|
}
|
|
}
|
|
|
|
return ResultSuccess();
|
|
}
|
|
|
|
Result KConditionVariable::WaitForAddress(ams::svc::Handle handle, KProcessAddress addr, u32 value) {
|
|
KThread *cur_thread = std::addressof(GetCurrentThread());
|
|
|
|
/* Wait for the address. */
|
|
{
|
|
KScopedAutoObject<KThread> owner_thread;
|
|
MESOSPHERE_ASSERT(owner_thread.IsNull());
|
|
{
|
|
KScopedSchedulerLock sl;
|
|
cur_thread->SetSyncedObject(nullptr, ResultSuccess());
|
|
|
|
/* Check if the thread should terminate. */
|
|
R_UNLESS(!cur_thread->IsTerminationRequested(), svc::ResultTerminationRequested());
|
|
|
|
{
|
|
/* Read the tag from userspace. */
|
|
u32 test_tag;
|
|
R_UNLESS(ReadFromUser(std::addressof(test_tag), addr), svc::ResultInvalidCurrentMemory());
|
|
|
|
/* If the tag isn't the handle (with wait mask), we're done. */
|
|
R_SUCCEED_IF(test_tag != (handle | ams::svc::HandleWaitMask));
|
|
|
|
/* Get the lock owner thread. */
|
|
owner_thread = GetCurrentProcess().GetHandleTable().GetObjectWithoutPseudoHandle<KThread>(handle);
|
|
R_UNLESS(owner_thread.IsNotNull(), svc::ResultInvalidHandle());
|
|
|
|
/* Update the lock. */
|
|
cur_thread->SetAddressKey(addr, value);
|
|
owner_thread->AddWaiter(cur_thread);
|
|
cur_thread->SetState(KThread::ThreadState_Waiting);
|
|
}
|
|
}
|
|
MESOSPHERE_ASSERT(owner_thread.IsNotNull());
|
|
}
|
|
|
|
/* Remove the thread as a waiter from the lock owner. */
|
|
{
|
|
KScopedSchedulerLock sl;
|
|
KThread *owner_thread = cur_thread->GetLockOwner();
|
|
if (owner_thread != nullptr) {
|
|
owner_thread->RemoveWaiter(cur_thread);
|
|
}
|
|
}
|
|
|
|
/* Get the wait result. */
|
|
KSynchronizationObject *dummy;
|
|
return cur_thread->GetWaitResult(std::addressof(dummy));
|
|
}
|
|
|
|
KThread *KConditionVariable::SignalImpl(KThread *thread) {
|
|
/* Check pre-conditions. */
|
|
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
|
|
|
|
/* Update the tag. */
|
|
KProcessAddress address = thread->GetAddressKey();
|
|
u32 own_tag = thread->GetAddressKeyValue();
|
|
|
|
u32 prev_tag;
|
|
bool can_access;
|
|
{
|
|
KScopedInterruptDisable di;
|
|
|
|
can_access = cpu::CanAccessAtomic(address);
|
|
if (AMS_LIKELY(can_access)) {
|
|
UpdateLockAtomic(std::addressof(prev_tag), address, own_tag, ams::svc::HandleWaitMask);
|
|
}
|
|
}
|
|
|
|
KThread *thread_to_close = nullptr;
|
|
if (AMS_LIKELY(can_access)) {
|
|
if (prev_tag == ams::svc::InvalidHandle) {
|
|
/* If nobody held the lock previously, we're all good. */
|
|
thread->SetSyncedObject(nullptr, ResultSuccess());
|
|
thread->Wakeup();
|
|
} else {
|
|
/* Get the previous owner. */
|
|
KThread *owner_thread = GetCurrentProcess().GetHandleTable().GetObjectWithoutPseudoHandle<KThread>(static_cast<ams::svc::Handle>(prev_tag & ~ams::svc::HandleWaitMask))
|
|
.ReleasePointerUnsafe();
|
|
if (AMS_LIKELY(owner_thread != nullptr)) {
|
|
/* Add the thread as a waiter on the owner. */
|
|
owner_thread->AddWaiter(thread);
|
|
thread_to_close = owner_thread;
|
|
} else {
|
|
/* The lock was tagged with a thread that doesn't exist. */
|
|
thread->SetSyncedObject(nullptr, svc::ResultInvalidState());
|
|
thread->Wakeup();
|
|
}
|
|
}
|
|
} else {
|
|
/* If the address wasn't accessible, note so. */
|
|
thread->SetSyncedObject(nullptr, svc::ResultInvalidCurrentMemory());
|
|
thread->Wakeup();
|
|
}
|
|
|
|
return thread_to_close;
|
|
}
|
|
|
|
void KConditionVariable::Signal(uintptr_t cv_key, s32 count) {
|
|
/* Prepare for signaling. */
|
|
constexpr int MaxThreads = 16;
|
|
KLinkedList<KThread> thread_list;
|
|
KThread *thread_array[MaxThreads];
|
|
int num_to_close = 0;
|
|
|
|
/* Perform signaling. */
|
|
int num_waiters = 0;
|
|
{
|
|
KScopedSchedulerLock sl;
|
|
|
|
auto it = m_tree.nfind_light({ cv_key, -1 });
|
|
while ((it != m_tree.end()) && (count <= 0 || num_waiters < count) && (it->GetConditionVariableKey() == cv_key)) {
|
|
KThread *target_thread = std::addressof(*it);
|
|
|
|
if (KThread *thread = this->SignalImpl(target_thread); thread != nullptr) {
|
|
if (num_to_close < MaxThreads) {
|
|
thread_array[num_to_close++] = thread;
|
|
} else {
|
|
thread_list.push_back(*thread);
|
|
}
|
|
}
|
|
|
|
it = m_tree.erase(it);
|
|
target_thread->ClearConditionVariable();
|
|
++num_waiters;
|
|
}
|
|
|
|
/* If we have no waiters, clear the has waiter flag. */
|
|
if (it == m_tree.end() || it->GetConditionVariableKey() != cv_key) {
|
|
const u32 has_waiter_flag = 0;
|
|
WriteToUser(cv_key, std::addressof(has_waiter_flag));
|
|
}
|
|
}
|
|
|
|
/* Close threads in the array. */
|
|
for (auto i = 0; i < num_to_close; ++i) {
|
|
thread_array[i]->Close();
|
|
}
|
|
|
|
/* Close threads in the list. */
|
|
for (auto it = thread_list.begin(); it != thread_list.end(); it = thread_list.erase(it)) {
|
|
(*it).Close();
|
|
}
|
|
}
|
|
|
|
Result KConditionVariable::Wait(KProcessAddress addr, uintptr_t key, u32 value, s64 timeout) {
|
|
/* Prepare to wait. */
|
|
KThread *cur_thread = GetCurrentThreadPointer();
|
|
KHardwareTimer *timer;
|
|
|
|
{
|
|
KScopedSchedulerLockAndSleep slp(std::addressof(timer), cur_thread, timeout);
|
|
|
|
/* Set the synced object. */
|
|
cur_thread->SetSyncedObject(nullptr, ams::svc::ResultTimedOut());
|
|
|
|
/* Check that the thread isn't terminating. */
|
|
if (cur_thread->IsTerminationRequested()) {
|
|
slp.CancelSleep();
|
|
return svc::ResultTerminationRequested();
|
|
}
|
|
|
|
/* Update the value and process for the next owner. */
|
|
{
|
|
/* Remove waiter thread. */
|
|
s32 num_waiters;
|
|
KThread *next_owner_thread = cur_thread->RemoveWaiterByKey(std::addressof(num_waiters), GetInteger(addr));
|
|
|
|
/* Update for the next owner thread. */
|
|
u32 next_value = 0;
|
|
if (next_owner_thread != nullptr) {
|
|
/* Get the next tag value. */
|
|
next_value = next_owner_thread->GetAddressKeyValue();
|
|
if (num_waiters > 1) {
|
|
next_value |= ams::svc::HandleWaitMask;
|
|
}
|
|
|
|
/* Wake up the next owner. */
|
|
next_owner_thread->SetSyncedObject(nullptr, ResultSuccess());
|
|
next_owner_thread->Wakeup();
|
|
}
|
|
|
|
/* Write to the cv key. */
|
|
{
|
|
const u32 has_waiter_flag = 1;
|
|
WriteToUser(key, std::addressof(has_waiter_flag));
|
|
cpu::DataMemoryBarrier();
|
|
}
|
|
|
|
/* Write the value to userspace. */
|
|
if (!WriteToUser(addr, std::addressof(next_value))) {
|
|
slp.CancelSleep();
|
|
return svc::ResultInvalidCurrentMemory();
|
|
}
|
|
}
|
|
|
|
/* Update condition variable tracking. */
|
|
{
|
|
cur_thread->SetConditionVariable(std::addressof(m_tree), addr, key, value);
|
|
m_tree.insert(*cur_thread);
|
|
}
|
|
|
|
/* If the timeout is non-zero, set the thread as waiting. */
|
|
if (timeout != 0) {
|
|
cur_thread->SetState(KThread::ThreadState_Waiting);
|
|
}
|
|
}
|
|
|
|
/* Cancel the timer wait. */
|
|
if (timer != nullptr) {
|
|
timer->CancelTask(cur_thread);
|
|
}
|
|
|
|
/* Remove from the condition variable. */
|
|
{
|
|
KScopedSchedulerLock sl;
|
|
|
|
if (KThread *owner = cur_thread->GetLockOwner(); owner != nullptr) {
|
|
owner->RemoveWaiter(cur_thread);
|
|
}
|
|
|
|
if (cur_thread->IsWaitingForConditionVariable()) {
|
|
m_tree.erase(m_tree.iterator_to(*cur_thread));
|
|
cur_thread->ClearConditionVariable();
|
|
}
|
|
}
|
|
|
|
/* Get the result. */
|
|
KSynchronizationObject *dummy;
|
|
return cur_thread->GetWaitResult(std::addressof(dummy));
|
|
}
|
|
|
|
}
|