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kernel: fix incorrect locking order in suspension

master
Liam 2023-01-23 14:56:06 +07:00
parent 78df1ddce8
commit 5086380a63
3 changed files with 26 additions and 34 deletions
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13
src/core/hle/kernel/k_thread.cpp
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@ -763,19 +763,6 @@ void KThread::Continue() {
KScheduler::OnThreadStateChanged(kernel, this, old_state);
}
void KThread::WaitUntilSuspended() {
// Make sure we have a suspend requested.
ASSERT(IsSuspendRequested());
// Loop until the thread is not executing on any core.
for (std::size_t i = 0; i < static_cast<std::size_t>(Core::Hardware::NUM_CPU_CORES); ++i) {
KThread* core_thread{};
do {
core_thread = kernel.Scheduler(i).GetSchedulerCurrentThread();
} while (core_thread == this);
}
}
Result KThread::SetActivity(Svc::ThreadActivity activity) {
// Lock ourselves.
KScopedLightLock lk(activity_pause_lock);

2
src/core/hle/kernel/k_thread.h
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@ -214,8 +214,6 @@ public:
void Continue();
void WaitUntilSuspended();
constexpr void SetSyncedIndex(s32 index) {
synced_index = index;
}

45
src/core/hle/kernel/kernel.cpp
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@ -1198,27 +1198,34 @@ void KernelCore::Suspend(bool suspended) {
const bool should_suspend{exception_exited || suspended};
const auto activity = should_suspend ? ProcessActivity::Paused : ProcessActivity::Runnable;
std::vector<KScopedAutoObject<KThread>> process_threads;
{
KScopedSchedulerLock sl{*this};
if (auto* process = CurrentProcess(); process != nullptr) {
process->SetActivity(activity);
if (!should_suspend) {
// Runnable now; no need to wait.
return;
}
for (auto* thread : process->GetThreadList()) {
process_threads.emplace_back(thread);
}
}
//! This refers to the application process, not the current process.
KScopedAutoObject<KProcess> process = CurrentProcess();
if (process.IsNull()) {
return;
}
// Wait for execution to stop.
for (auto& thread : process_threads) {
thread->WaitUntilSuspended();
// Set the new activity.
process->SetActivity(activity);
// Wait for process execution to stop.
bool must_wait{should_suspend};
// KernelCore::Suspend must be called from locked context, or we
// could race another call to SetActivity, interfering with waiting.
while (must_wait) {
KScopedSchedulerLock sl{*this};
// Assume that all threads have finished running.
must_wait = false;
for (auto i = 0; i < static_cast<s32>(Core::Hardware::NUM_CPU_CORES); ++i) {
if (Scheduler(i).GetSchedulerCurrentThread()->GetOwnerProcess() ==
process.GetPointerUnsafe()) {
// A thread has not finished running yet.
// Continue waiting.
must_wait = true;
}
}
}
}