15 files changed, 132 insertions, 115 deletions

diff --git a/src/core/hle/kernel/address_arbiter.cpp b/src/core/hle/kernel/address_arbiter.cpp
index b882eaa0f..048acd30e 100644
--- a/src/core/hle/kernel/address_arbiter.cpp
+++ b/src/core/hle/kernel/address_arbiter.cpp
@@ -275,12 +275,6 @@ ResultCode AddressArbiter::WaitForAddressIfEqual(VAddr address, s32 value, s64 t
     return current_thread->GetSignalingResult();
 }
 
-void AddressArbiter::HandleWakeupThread(std::shared_ptr<Thread> thread) {
-    ASSERT(thread->GetStatus() == ThreadStatus::WaitArb);
-    RemoveThread(thread);
-    thread->SetArbiterWaitAddress(0);
-}
-
 void AddressArbiter::InsertThread(std::shared_ptr<Thread> thread) {
     const VAddr arb_addr = thread->GetArbiterWaitAddress();
     std::list<std::shared_ptr<Thread>>& thread_list = arb_threads[arb_addr];
diff --git a/src/core/hle/kernel/address_arbiter.h b/src/core/hle/kernel/address_arbiter.h
index 0b05d533c..b91edc67d 100644
--- a/src/core/hle/kernel/address_arbiter.h
+++ b/src/core/hle/kernel/address_arbiter.h
@@ -50,9 +50,6 @@ public:
     /// Waits on an address with a particular arbitration type.
     ResultCode WaitForAddress(VAddr address, ArbitrationType type, s32 value, s64 timeout_ns);
 
-    /// Removes a thread from the container and resets its address arbiter adress to 0
-    void HandleWakeupThread(std::shared_ptr<Thread> thread);
-
 private:
     /// Signals an address being waited on.
     ResultCode SignalToAddressOnly(VAddr address, s32 num_to_wake);
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index bb3e312a7..929db696d 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -68,6 +68,12 @@ struct KernelCore::Impl {
         InitializeSuspendThreads();
     }
 
+    void InitializeCores() {
+        for (auto& core : cores) {
+            core.Initialize(current_process->Is64BitProcess());
+        }
+    }
+
     void Shutdown() {
         next_object_id = 0;
         next_kernel_process_id = Process::InitialKIPIDMin;
@@ -116,7 +122,7 @@ struct KernelCore::Impl {
             Core::MakeExclusiveMonitor(system.Memory(), Core::Hardware::NUM_CPU_CORES);
         for (std::size_t i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) {
             schedulers[i] = std::make_unique<Kernel::Scheduler>(system, i);
-            cores.emplace_back(system, i, *schedulers[i], interrupts[i]);
+            cores.emplace_back(i, system, *schedulers[i], interrupts);
         }
     }
 
@@ -181,6 +187,7 @@ struct KernelCore::Impl {
         if (process == nullptr) {
             return;
         }
+
         const u32 core_id = GetCurrentHostThreadID();
         if (core_id < Core::Hardware::NUM_CPU_CORES) {
             system.Memory().SetCurrentPageTable(*process, core_id);
@@ -372,6 +379,10 @@ void KernelCore::Initialize() {
     impl->Initialize(*this);
 }
 
+void KernelCore::InitializeCores() {
+    impl->InitializeCores();
+}
+
 void KernelCore::Shutdown() {
     impl->Shutdown();
 }
@@ -486,12 +497,17 @@ const Core::ExclusiveMonitor& KernelCore::GetExclusiveMonitor() const {
 }
 
 void KernelCore::InvalidateAllInstructionCaches() {
-    auto& threads = GlobalScheduler().GetThreadList();
-    for (auto& thread : threads) {
-        if (!thread->IsHLEThread()) {
-            auto& arm_interface = thread->ArmInterface();
-            arm_interface.ClearInstructionCache();
+    for (auto& physical_core : impl->cores) {
+        physical_core.ArmInterface().ClearInstructionCache();
+    }
+}
+
+void KernelCore::InvalidateCpuInstructionCacheRange(VAddr addr, std::size_t size) {
+    for (auto& physical_core : impl->cores) {
+        if (!physical_core.IsInitialized()) {
+            continue;
         }
+        physical_core.ArmInterface().InvalidateCacheRange(addr, size);
     }
 }
 
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 16285c3f0..a73a93039 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -74,6 +74,9 @@ public:
     /// Resets the kernel to a clean slate for use.
     void Initialize();
 
+    /// Initializes the CPU cores.
+    void InitializeCores();
+
     /// Clears all resources in use by the kernel instance.
     void Shutdown();
 
@@ -153,6 +156,8 @@ public:
 
     void InvalidateAllInstructionCaches();
 
+    void InvalidateCpuInstructionCacheRange(VAddr addr, std::size_t size);
+
     /// Adds a port to the named port table
     void AddNamedPort(std::string name, std::shared_ptr<ClientPort> port);
 
diff --git a/src/core/hle/kernel/memory/page_table.cpp b/src/core/hle/kernel/memory/page_table.cpp
index a3fadb533..f53a7be82 100644
--- a/src/core/hle/kernel/memory/page_table.cpp
+++ b/src/core/hle/kernel/memory/page_table.cpp
@@ -670,6 +670,11 @@ ResultCode PageTable::SetCodeMemoryPermission(VAddr addr, std::size_t size, Memo
         return RESULT_SUCCESS;
     }
 
+    if ((prev_perm & MemoryPermission::Execute) != (perm & MemoryPermission::Execute)) {
+        // Memory execution state is changing, invalidate CPU cache range
+        system.InvalidateCpuInstructionCacheRange(addr, size);
+    }
+
     const std::size_t num_pages{size / PageSize};
     const OperationType operation{(perm & MemoryPermission::Execute) != MemoryPermission::None
                                       ? OperationType::ChangePermissionsAndRefresh
diff --git a/src/core/hle/kernel/physical_core.cpp b/src/core/hle/kernel/physical_core.cpp
index 6e04d025f..50aca5752 100644
--- a/src/core/hle/kernel/physical_core.cpp
+++ b/src/core/hle/kernel/physical_core.cpp
@@ -4,21 +4,43 @@
 
 #include "common/spin_lock.h"
 #include "core/arm/cpu_interrupt_handler.h"
+#include "core/arm/dynarmic/arm_dynarmic_32.h"
+#include "core/arm/dynarmic/arm_dynarmic_64.h"
 #include "core/core.h"
+#include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/physical_core.h"
 #include "core/hle/kernel/scheduler.h"
 
 namespace Kernel {
 
-PhysicalCore::PhysicalCore(Core::System& system, std::size_t id, Kernel::Scheduler& scheduler,
-                           Core::CPUInterruptHandler& interrupt_handler)
-    : interrupt_handler{interrupt_handler},
-      core_index{id}, scheduler{scheduler}, guard{std::make_unique<Common::SpinLock>()} {}
+PhysicalCore::PhysicalCore(std::size_t core_index, Core::System& system,
+                           Kernel::Scheduler& scheduler, Core::CPUInterrupts& interrupts)
+    : core_index{core_index}, system{system}, scheduler{scheduler},
+      interrupts{interrupts}, guard{std::make_unique<Common::SpinLock>()} {}
 
 PhysicalCore::~PhysicalCore() = default;
 
+void PhysicalCore::Initialize([[maybe_unused]] bool is_64_bit) {
+#ifdef ARCHITECTURE_x86_64
+    auto& kernel = system.Kernel();
+    if (is_64_bit) {
+        arm_interface = std::make_unique<Core::ARM_Dynarmic_64>(
+            system, interrupts, kernel.IsMulticore(), kernel.GetExclusiveMonitor(), core_index);
+    } else {
+        arm_interface = std::make_unique<Core::ARM_Dynarmic_32>(
+            system, interrupts, kernel.IsMulticore(), kernel.GetExclusiveMonitor(), core_index);
+    }
+#else
+#error Platform not supported yet.
+#endif
+}
+
+void PhysicalCore::Run() {
+    arm_interface->Run();
+}
+
 void PhysicalCore::Idle() {
-    interrupt_handler.AwaitInterrupt();
+    interrupts[core_index].AwaitInterrupt();
 }
 
 void PhysicalCore::Shutdown() {
@@ -26,18 +48,18 @@ void PhysicalCore::Shutdown() {
 }
 
 bool PhysicalCore::IsInterrupted() const {
-    return interrupt_handler.IsInterrupted();
+    return interrupts[core_index].IsInterrupted();
 }
 
 void PhysicalCore::Interrupt() {
     guard->lock();
-    interrupt_handler.SetInterrupt(true);
+    interrupts[core_index].SetInterrupt(true);
     guard->unlock();
 }
 
 void PhysicalCore::ClearInterrupt() {
     guard->lock();
-    interrupt_handler.SetInterrupt(false);
+    interrupts[core_index].SetInterrupt(false);
     guard->unlock();
 }
 
diff --git a/src/core/hle/kernel/physical_core.h b/src/core/hle/kernel/physical_core.h
index d7a7a951c..37513130a 100644
--- a/src/core/hle/kernel/physical_core.h
+++ b/src/core/hle/kernel/physical_core.h
@@ -4,9 +4,12 @@
 
 #pragma once
 
+#include <array>
 #include <cstddef>
 #include <memory>
 
+#include "core/arm/arm_interface.h"
+
 namespace Common {
 class SpinLock;
 }
@@ -16,7 +19,6 @@ class Scheduler;
 } // namespace Kernel
 
 namespace Core {
-class ARM_Interface;
 class CPUInterruptHandler;
 class ExclusiveMonitor;
 class System;
@@ -26,8 +28,8 @@ namespace Kernel {
 
 class PhysicalCore {
 public:
-    PhysicalCore(Core::System& system, std::size_t id, Kernel::Scheduler& scheduler,
-                 Core::CPUInterruptHandler& interrupt_handler);
+    PhysicalCore(std::size_t core_index, Core::System& system, Kernel::Scheduler& scheduler,
+                 Core::CPUInterrupts& interrupts);
     ~PhysicalCore();
 
     PhysicalCore(const PhysicalCore&) = delete;
@@ -36,7 +38,14 @@ public:
     PhysicalCore(PhysicalCore&&) = default;
     PhysicalCore& operator=(PhysicalCore&&) = default;
 
+    /// Initialize the core for the specified parameters.
+    void Initialize(bool is_64_bit);
+
+    /// Execute current jit state
+    void Run();
+
     void Idle();
+
     /// Interrupt this physical core.
     void Interrupt();
 
@@ -49,6 +58,18 @@ public:
     // Shutdown this physical core.
     void Shutdown();
 
+    bool IsInitialized() const {
+        return arm_interface != nullptr;
+    }
+
+    Core::ARM_Interface& ArmInterface() {
+        return *arm_interface;
+    }
+
+    const Core::ARM_Interface& ArmInterface() const {
+        return *arm_interface;
+    }
+
     bool IsMainCore() const {
         return core_index == 0;
     }
@@ -70,10 +91,12 @@ public:
     }
 
 private:
-    Core::CPUInterruptHandler& interrupt_handler;
-    std::size_t core_index;
+    const std::size_t core_index;
+    Core::System& system;
     Kernel::Scheduler& scheduler;
+    Core::CPUInterrupts& interrupts;
     std::unique_ptr<Common::SpinLock> guard;
+    std::unique_ptr<Core::ARM_Interface> arm_interface;
 };
 
 } // namespace Kernel
diff --git a/src/core/hle/kernel/scheduler.cpp b/src/core/hle/kernel/scheduler.cpp
index 6b7db5372..5c63b0b4a 100644
--- a/src/core/hle/kernel/scheduler.cpp
+++ b/src/core/hle/kernel/scheduler.cpp
@@ -618,14 +618,16 @@ void Scheduler::OnThreadStart() {
     SwitchContextStep2();
 }
 
-void Scheduler::Unload() {
-    Thread* thread = current_thread.get();
+void Scheduler::Unload(Thread* thread) {
     if (thread) {
-        thread->SetContinuousOnSVC(false);
         thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
         thread->SetIsRunning(false);
+        if (thread->IsContinuousOnSVC() && !thread->IsHLEThread()) {
+            system.ArmInterface(core_id).ExceptionalExit();
+            thread->SetContinuousOnSVC(false);
+        }
         if (!thread->IsHLEThread() && !thread->HasExited()) {
-            Core::ARM_Interface& cpu_core = thread->ArmInterface();
+            Core::ARM_Interface& cpu_core = system.ArmInterface(core_id);
             cpu_core.SaveContext(thread->GetContext32());
             cpu_core.SaveContext(thread->GetContext64());
             // Save the TPIDR_EL0 system register in case it was modified.
@@ -636,8 +638,11 @@ void Scheduler::Unload() {
     }
 }
 
-void Scheduler::Reload() {
-    Thread* thread = current_thread.get();
+void Scheduler::Unload() {
+    Unload(current_thread.get());
+}
+
+void Scheduler::Reload(Thread* thread) {
     if (thread) {
         ASSERT_MSG(thread->GetSchedulingStatus() == ThreadSchedStatus::Runnable,
                    "Thread must be runnable.");
@@ -652,42 +657,23 @@ void Scheduler::Reload() {
             system.Kernel().MakeCurrentProcess(thread_owner_process);
         }
         if (!thread->IsHLEThread()) {
-            Core::ARM_Interface& cpu_core = thread->ArmInterface();
+            Core::ARM_Interface& cpu_core = system.ArmInterface(core_id);
             cpu_core.LoadContext(thread->GetContext32());
             cpu_core.LoadContext(thread->GetContext64());
             cpu_core.SetTlsAddress(thread->GetTLSAddress());
             cpu_core.SetTPIDR_EL0(thread->GetTPIDR_EL0());
-            cpu_core.ChangeProcessorID(this->core_id);
             cpu_core.ClearExclusiveState();
         }
     }
 }
 
+void Scheduler::Reload() {
+    Reload(current_thread.get());
+}
+
 void Scheduler::SwitchContextStep2() {
     // Load context of new thread
-    if (selected_thread) {
-        ASSERT_MSG(selected_thread->GetSchedulingStatus() == ThreadSchedStatus::Runnable,
-                   "Thread must be runnable.");
-
-        // Cancel any outstanding wakeup events for this thread
-        selected_thread->SetIsRunning(true);
-        selected_thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
-        selected_thread->SetWasRunning(false);
-
-        auto* const thread_owner_process = current_thread->GetOwnerProcess();
-        if (thread_owner_process != nullptr) {
-            system.Kernel().MakeCurrentProcess(thread_owner_process);
-        }
-        if (!selected_thread->IsHLEThread()) {
-            Core::ARM_Interface& cpu_core = selected_thread->ArmInterface();
-            cpu_core.LoadContext(selected_thread->GetContext32());
-            cpu_core.LoadContext(selected_thread->GetContext64());
-            cpu_core.SetTlsAddress(selected_thread->GetTLSAddress());
-            cpu_core.SetTPIDR_EL0(selected_thread->GetTPIDR_EL0());
-            cpu_core.ChangeProcessorID(this->core_id);
-            cpu_core.ClearExclusiveState();
-        }
-    }
+    Reload(selected_thread.get());
 
     TryDoContextSwitch();
 }
@@ -711,23 +697,7 @@ void Scheduler::SwitchContext() {
     UpdateLastContextSwitchTime(previous_thread, previous_process);
 
     // Save context for previous thread
-    if (previous_thread) {
-        if (new_thread != nullptr && new_thread->IsSuspendThread()) {
-            previous_thread->SetWasRunning(true);
-        }
-        previous_thread->SetContinuousOnSVC(false);
-        previous_thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
-        previous_thread->SetIsRunning(false);
-        if (!previous_thread->IsHLEThread() && !previous_thread->HasExited()) {
-            Core::ARM_Interface& cpu_core = previous_thread->ArmInterface();
-            cpu_core.SaveContext(previous_thread->GetContext32());
-            cpu_core.SaveContext(previous_thread->GetContext64());
-            // Save the TPIDR_EL0 system register in case it was modified.
-            previous_thread->SetTPIDR_EL0(cpu_core.GetTPIDR_EL0());
-            cpu_core.ClearExclusiveState();
-        }
-        previous_thread->context_guard.unlock();
-    }
+    Unload(previous_thread);
 
     std::shared_ptr<Common::Fiber>* old_context;
     if (previous_thread != nullptr) {
diff --git a/src/core/hle/kernel/scheduler.h b/src/core/hle/kernel/scheduler.h
index b6f04dcea..68db4a5ef 100644
--- a/src/core/hle/kernel/scheduler.h
+++ b/src/core/hle/kernel/scheduler.h
@@ -212,8 +212,10 @@ public:
 
     /// The next two are for SingleCore Only.
     /// Unload current thread before preempting core.
+    void Unload(Thread* thread);
     void Unload();
     /// Reload current thread after core preemption.
+    void Reload(Thread* thread);
     void Reload();
 
     /// Gets the current running thread
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index e3b770d66..95d6e2b4d 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -2639,6 +2639,9 @@ void Call(Core::System& system, u32 immediate) {
     auto& kernel = system.Kernel();
     kernel.EnterSVCProfile();
 
+    auto* thread = system.CurrentScheduler().GetCurrentThread();
+    thread->SetContinuousOnSVC(true);
+
     const FunctionDef* info = system.CurrentProcess()->Is64BitProcess() ? GetSVCInfo64(immediate)
                                                                         : GetSVCInfo32(immediate);
     if (info) {
@@ -2652,6 +2655,12 @@ void Call(Core::System& system, u32 immediate) {
     }
 
     kernel.ExitSVCProfile();
+
+    if (!thread->IsContinuousOnSVC()) {
+        auto* host_context = thread->GetHostContext().get();
+        host_context->Rewind();
+    }
+
     system.EnterDynarmicProfile();
 }
 
diff --git a/src/core/hle/kernel/synchronization_object.h b/src/core/hle/kernel/synchronization_object.h
index f89b24204..7408ed51f 100644
--- a/src/core/hle/kernel/synchronization_object.h
+++ b/src/core/hle/kernel/synchronization_object.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <atomic>
 #include <memory>
 #include <vector>
 
@@ -56,7 +57,7 @@ public:
     void ClearWaitingThreads();
 
 protected:
-    bool is_signaled{}; // Tells if this sync object is signalled;
+    std::atomic_bool is_signaled{}; // Tells if this sync object is signaled
 
 private:
     /// Threads waiting for this object to become available
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index da0cb26b6..7d1eb2c6e 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -12,7 +12,6 @@
 #include "common/fiber.h"
 #include "common/logging/log.h"
 #include "common/thread_queue_list.h"
-#include "core/arm/arm_interface.h"
 #include "core/core.h"
 #include "core/cpu_manager.h"
 #include "core/hardware_properties.h"
@@ -62,7 +61,6 @@ void Thread::Stop() {
             // Mark the TLS slot in the thread's page as free.
             owner_process->FreeTLSRegion(tls_address);
         }
-        arm_interface.reset();
         has_exited = true;
     }
     global_handle = 0;
@@ -90,10 +88,6 @@ void Thread::ResumeFromWait() {
         // before actually resuming. We can ignore subsequent wakeups if the thread status has
         // already been set to ThreadStatus::Ready.
         return;
-
-    case ThreadStatus::Running:
-        DEBUG_ASSERT_MSG(false, "Thread with object id {} has already resumed.", GetObjectId());
-        return;
     case ThreadStatus::Dead:
         // This should never happen, as threads must complete before being stopped.
         DEBUG_ASSERT_MSG(false, "Thread with object id {} cannot be resumed because it's DEAD.",
@@ -217,22 +211,9 @@ ResultVal<std::shared_ptr<Thread>> Thread::Create(Core::System& system, ThreadTy
         thread->tls_address = 0;
     }
 
-    thread->arm_interface.reset();
+    // TODO(peachum): move to ScheduleThread() when scheduler is added so selected core is used
+    // to initialize the context
     if ((type_flags & THREADTYPE_HLE) == 0) {
-#ifdef ARCHITECTURE_x86_64
-        if (owner_process && !owner_process->Is64BitProcess()) {
-            thread->arm_interface = std::make_unique<Core::ARM_Dynarmic_32>(
-                system, kernel.Interrupts(), kernel.IsMulticore(), kernel.GetExclusiveMonitor(),
-                processor_id);
-        } else {
-            thread->arm_interface = std::make_unique<Core::ARM_Dynarmic_64>(
-                system, kernel.Interrupts(), kernel.IsMulticore(), kernel.GetExclusiveMonitor(),
-                processor_id);
-        }
-#else
-#error Platform not supported yet.
-#endif
-
         ResetThreadContext32(thread->context_32, static_cast<u32>(stack_top),
                              static_cast<u32>(entry_point), static_cast<u32>(arg));
         ResetThreadContext64(thread->context_64, stack_top, entry_point, arg);
@@ -268,14 +249,6 @@ VAddr Thread::GetCommandBufferAddress() const {
     return GetTLSAddress() + command_header_offset;
 }
 
-Core::ARM_Interface& Thread::ArmInterface() {
-    return *arm_interface;
-}
-
-const Core::ARM_Interface& Thread::ArmInterface() const {
-    return *arm_interface;
-}
-
 void Thread::SetStatus(ThreadStatus new_status) {
     if (new_status == status) {
         return;
@@ -283,7 +256,6 @@ void Thread::SetStatus(ThreadStatus new_status) {
 
     switch (new_status) {
     case ThreadStatus::Ready:
-    case ThreadStatus::Running:
         SetSchedulingStatus(ThreadSchedStatus::Runnable);
         break;
     case ThreadStatus::Dormant:
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index 8daf79fac..a75071e9b 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -72,7 +72,6 @@ enum ThreadProcessorId : s32 {
 };
 
 enum class ThreadStatus {
-    Running,      ///< Currently running
     Ready,        ///< Ready to run
     Paused,       ///< Paused by SetThreadActivity or debug
     WaitHLEEvent, ///< Waiting for hle event to finish
@@ -248,10 +247,6 @@ public:
 
     void SetSynchronizationResults(SynchronizationObject* object, ResultCode result);
 
-    Core::ARM_Interface& ArmInterface();
-
-    const Core::ARM_Interface& ArmInterface() const;
-
     SynchronizationObject* GetSignalingObject() const {
         return signaling_object;
     }
@@ -586,7 +581,6 @@ private:
     Common::SpinLock context_guard{};
     ThreadContext32 context_32{};
     ThreadContext64 context_64{};
-    std::unique_ptr<Core::ARM_Interface> arm_interface{};
     std::shared_ptr<Common::Fiber> host_context{};
 
     u64 thread_id = 0;
diff --git a/src/core/hle/kernel/time_manager.cpp b/src/core/hle/kernel/time_manager.cpp
index 95f2446c9..caf329bfb 100644
--- a/src/core/hle/kernel/time_manager.cpp
+++ b/src/core/hle/kernel/time_manager.cpp
@@ -24,11 +24,15 @@ TimeManager::TimeManager(Core::System& system_) : system{system_} {
                 return;
             }
             auto thread = this->system.Kernel().RetrieveThreadFromGlobalHandleTable(proper_handle);
-            thread->OnWakeUp();
+            if (thread) {
+                // Thread can be null if process has exited
+                thread->OnWakeUp();
+            }
         });
 }
 
 void TimeManager::ScheduleTimeEvent(Handle& event_handle, Thread* timetask, s64 nanoseconds) {
+    std::lock_guard lock{mutex};
     event_handle = timetask->GetGlobalHandle();
     if (nanoseconds > 0) {
         ASSERT(timetask);
@@ -43,6 +47,7 @@ void TimeManager::ScheduleTimeEvent(Handle& event_handle, Thread* timetask, s64
 }
 
 void TimeManager::UnscheduleTimeEvent(Handle event_handle) {
+    std::lock_guard lock{mutex};
     if (event_handle == InvalidHandle) {
         return;
     }
@@ -51,7 +56,7 @@ void TimeManager::UnscheduleTimeEvent(Handle event_handle) {
 }
 
 void TimeManager::CancelTimeEvent(Thread* time_task) {
-    Handle event_handle = time_task->GetGlobalHandle();
+    const Handle event_handle = time_task->GetGlobalHandle();
     UnscheduleTimeEvent(event_handle);
 }
 
diff --git a/src/core/hle/kernel/time_manager.h b/src/core/hle/kernel/time_manager.h
index 307a18765..f39df39a0 100644
--- a/src/core/hle/kernel/time_manager.h
+++ b/src/core/hle/kernel/time_manager.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <memory>
+#include <mutex>
 #include <unordered_map>
 
 #include "core/hle/kernel/object.h"
@@ -42,6 +43,7 @@ private:
     Core::System& system;
     std::shared_ptr<Core::Timing::EventType> time_manager_event_type;
     std::unordered_map<Handle, bool> cancelled_events;
+    std::mutex mutex;
 };
 
 } // namespace Kernel