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Allow locking external thread in MutexLock

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We want the ability to lock mutexes on behalf of other threads to refactor condition variables to match HOS on waking behavior.
This commit is contained in:
PixelyIon 2022-11-26 00:58:45 +05:30 committed by Mark Collins
parent 6bbe9de881
commit 1eb4eec103
3 changed files with 16 additions and 13 deletions
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2
app/src/main/cpp/skyline/kernel/svc.cpp
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@ -751,7 +751,7 @@ namespace skyline::kernel::svc {
KHandle ownerHandle{state.ctx->gpr.w0};
KHandle requesterHandle{state.ctx->gpr.w2};
auto result{state.process->MutexLock(mutex, ownerHandle, requesterHandle)};
auto result{state.process->MutexLock(state.thread, mutex, ownerHandle, requesterHandle)};
if (result == Result{})
Logger::Debug("Locked 0x{:X}", mutex);
else if (result == result::InvalidCurrentMemory)

24
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -111,8 +111,8 @@ namespace skyline::kernel::type {
constexpr u32 HandleWaitersBit{1UL << 30}; //!< A bit which denotes if a mutex psuedo-handle has waiters or not
Result KProcess::MutexLock(u32 *mutex, KHandle ownerHandle, KHandle tag, bool failOnOutdated) {
TRACE_EVENT_FMT("kernel", "MutexLock 0x{:X}", mutex);
Result KProcess::MutexLock(const std::shared_ptr<KThread> &thread, u32 *mutex, KHandle ownerHandle, KHandle tag, bool failOnOutdated) {
TRACE_EVENT_FMT("kernel", "MutexLock 0x{:X} @ 0x{:X}", mutex, thread->id);
std::shared_ptr<KThread> owner;
try {
@ -126,7 +126,7 @@ namespace skyline::kernel::type {
bool isHighestPriority;
{
std::scoped_lock lock{owner->waiterMutex, state.thread->waiterMutex}; // We need to lock both mutexes at the same time as we mutate the owner and the current thread, the ordering of locks **must** match MutexUnlock to avoid deadlocks
std::scoped_lock lock{owner->waiterMutex, thread->waiterMutex}; // We need to lock both mutexes at the same time as we mutate the owner and the current thread, the ordering of locks **must** match MutexUnlock to avoid deadlocks
u32 value{__atomic_load_n(mutex, __ATOMIC_SEQ_CST)};
if (value != (ownerHandle | HandleWaitersBit))
@ -134,19 +134,21 @@ namespace skyline::kernel::type {
return failOnOutdated ? result::InvalidCurrentMemory : Result{};
auto &waiters{owner->waiters};
isHighestPriority = waiters.insert(std::upper_bound(waiters.begin(), waiters.end(), state.thread->priority.load(), KThread::IsHigherPriority), state.thread) == waiters.begin();
state.scheduler->RemoveThread();
isHighestPriority = waiters.insert(std::upper_bound(waiters.begin(), waiters.end(), thread->priority.load(), KThread::IsHigherPriority), thread) == waiters.begin();
if (thread == state.thread)
state.scheduler->RemoveThread();
state.thread->waitThread = owner;
state.thread->waitKey = mutex;
state.thread->waitTag = tag;
thread->waitThread = owner;
thread->waitKey = mutex;
thread->waitTag = tag;
}
if (isHighestPriority)
// If we were the highest priority thread then we need to inherit priorities for all threads we're waiting on recursively
state.thread->UpdatePriorityInheritance();
thread->UpdatePriorityInheritance();
state.scheduler->WaitSchedule();
if (thread == state.thread)
state.scheduler->WaitSchedule();
return {};
}
@ -247,7 +249,7 @@ namespace skyline::kernel::type {
KHandle value{};
if (!__atomic_compare_exchange_n(mutex, &value, tag, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
while (MutexLock(mutex, value & ~HandleWaitersBit, tag, true) != Result{})
while (MutexLock(state.thread, mutex, value & ~HandleWaitersBit, tag, true) != Result{})
if ((value = __atomic_or_fetch(mutex, HandleWaitersBit, __ATOMIC_SEQ_CST)) == HandleWaitersBit)
if (__atomic_compare_exchange_n(mutex, &value, tag, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
break;

3
app/src/main/cpp/skyline/kernel/types/KProcess.h
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@ -210,11 +210,12 @@ namespace skyline {
/**
* @brief Locks the mutex at the specified address
* @param thread The thread that is locking the mutex
* @param ownerHandle The psuedo-handle of the current mutex owner
* @param tag The handle of the thread which is requesting this lock
* @param failOnOutdated If true, the function will return InvalidCurrentMemory if the supplied ownerHandle is outdated
*/
Result MutexLock(u32 *mutex, KHandle ownerHandle, KHandle tag, bool failOnOutdated = false);
Result MutexLock(const std::shared_ptr<KThread> &thread, u32 *mutex, KHandle ownerHandle, KHandle tag, bool failOnOutdated = false);
/**
* @brief Unlocks the mutex at the specified address