15 files changed, 101 insertions, 110 deletions

diff --git a/src/audio_core/device/device_session.cpp b/src/audio_core/device/device_session.cpp
index c41d9d1ea..ee42ae529 100644
--- a/src/audio_core/device/device_session.cpp
+++ b/src/audio_core/device/device_session.cpp
@@ -18,9 +18,7 @@ constexpr auto INCREMENT_TIME{5ms};
 DeviceSession::DeviceSession(Core::System& system_)
     : system{system_}, thread_event{Core::Timing::CreateEvent(
                            "AudioOutSampleTick",
-                           [this](std::uintptr_t, s64 time, std::chrono::nanoseconds) {
-                               return ThreadFunc();
-                           })} {}
+                           [this](s64 time, std::chrono::nanoseconds) { return ThreadFunc(); })} {}
 
 DeviceSession::~DeviceSession() {
     Finalize();
diff --git a/src/core/core_timing.cpp b/src/core/core_timing.cpp
index d6b5abc68..fc536413b 100644
--- a/src/core/core_timing.cpp
+++ b/src/core/core_timing.cpp
@@ -29,7 +29,6 @@ std::shared_ptr<EventType> CreateEvent(std::string name, TimedCallback&& callbac
 struct CoreTiming::Event {
     s64 time;
     u64 fifo_order;
-    std::uintptr_t user_data;
     std::weak_ptr<EventType> type;
     s64 reschedule_time;
     heap_t::handle_type handle{};
@@ -67,17 +66,15 @@ void CoreTiming::Initialize(std::function<void()>&& on_thread_init_) {
     event_fifo_id = 0;
     shutting_down = false;
     cpu_ticks = 0;
-    const auto empty_timed_callback = [](std::uintptr_t, u64, std::chrono::nanoseconds)
-        -> std::optional<std::chrono::nanoseconds> { return std::nullopt; };
-    ev_lost = CreateEvent("_lost_event", empty_timed_callback);
     if (is_multicore) {
         timer_thread = std::make_unique<std::jthread>(ThreadEntry, std::ref(*this));
     }
 }
 
 void CoreTiming::ClearPendingEvents() {
-    std::scoped_lock lock{basic_lock};
+    std::scoped_lock lock{advance_lock, basic_lock};
     event_queue.clear();
+    event.Set();
 }
 
 void CoreTiming::Pause(bool is_paused) {
@@ -119,14 +116,12 @@ bool CoreTiming::HasPendingEvents() const {
 }
 
 void CoreTiming::ScheduleEvent(std::chrono::nanoseconds ns_into_future,
-                               const std::shared_ptr<EventType>& event_type,
-                               std::uintptr_t user_data, bool absolute_time) {
+                               const std::shared_ptr<EventType>& event_type, bool absolute_time) {
     {
         std::scoped_lock scope{basic_lock};
         const auto next_time{absolute_time ? ns_into_future : GetGlobalTimeNs() + ns_into_future};
 
-        auto h{event_queue.emplace(
-            Event{next_time.count(), event_fifo_id++, user_data, event_type, 0})};
+        auto h{event_queue.emplace(Event{next_time.count(), event_fifo_id++, event_type, 0})};
         (*h).handle = h;
     }
 
@@ -136,13 +131,13 @@ void CoreTiming::ScheduleEvent(std::chrono::nanoseconds ns_into_future,
 void CoreTiming::ScheduleLoopingEvent(std::chrono::nanoseconds start_time,
                                       std::chrono::nanoseconds resched_time,
                                       const std::shared_ptr<EventType>& event_type,
-                                      std::uintptr_t user_data, bool absolute_time) {
+                                      bool absolute_time) {
     {
         std::scoped_lock scope{basic_lock};
         const auto next_time{absolute_time ? start_time : GetGlobalTimeNs() + start_time};
 
-        auto h{event_queue.emplace(Event{next_time.count(), event_fifo_id++, user_data, event_type,
-                                         resched_time.count()})};
+        auto h{event_queue.emplace(
+            Event{next_time.count(), event_fifo_id++, event_type, resched_time.count()})};
         (*h).handle = h;
     }
 
@@ -150,14 +145,14 @@ void CoreTiming::ScheduleLoopingEvent(std::chrono::nanoseconds start_time,
 }
 
 void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
-                                 std::uintptr_t user_data, bool wait) {
+                                 UnscheduleEventType type) {
     {
         std::scoped_lock lk{basic_lock};
 
         std::vector<heap_t::handle_type> to_remove;
         for (auto itr = event_queue.begin(); itr != event_queue.end(); itr++) {
             const Event& e = *itr;
-            if (e.type.lock().get() == event_type.get() && e.user_data == user_data) {
+            if (e.type.lock().get() == event_type.get()) {
                 to_remove.push_back(itr->handle);
             }
         }
@@ -165,10 +160,12 @@ void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
         for (auto h : to_remove) {
             event_queue.erase(h);
         }
+
+        event_type->sequence_number++;
     }
 
     // Force any in-progress events to finish
-    if (wait) {
+    if (type == UnscheduleEventType::Wait) {
         std::scoped_lock lk{advance_lock};
     }
 }
@@ -208,28 +205,31 @@ std::optional<s64> CoreTiming::Advance() {
         const Event& evt = event_queue.top();
 
         if (const auto event_type{evt.type.lock()}) {
-            if (evt.reschedule_time == 0) {
-                const auto evt_user_data = evt.user_data;
-                const auto evt_time = evt.time;
+            const auto evt_time = evt.time;
+            const auto evt_sequence_num = event_type->sequence_number;
 
+            if (evt.reschedule_time == 0) {
                 event_queue.pop();
 
                 basic_lock.unlock();
 
                 event_type->callback(
-                    evt_user_data, evt_time,
-                    std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt_time});
+                    evt_time, std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt_time});
 
                 basic_lock.lock();
             } else {
                 basic_lock.unlock();
 
                 const auto new_schedule_time{event_type->callback(
-                    evt.user_data, evt.time,
-                    std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt.time})};
+                    evt_time, std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt_time})};
 
                 basic_lock.lock();
 
+                if (evt_sequence_num != event_type->sequence_number) {
+                    // Heap handle is invalidated after external modification.
+                    continue;
+                }
+
                 const auto next_schedule_time{new_schedule_time.has_value()
                                                   ? new_schedule_time.value().count()
                                                   : evt.reschedule_time};
@@ -241,8 +241,8 @@ std::optional<s64> CoreTiming::Advance() {
                     next_time = pause_end_time + next_schedule_time;
                 }
 
-                event_queue.update(evt.handle, Event{next_time, event_fifo_id++, evt.user_data,
-                                                     evt.type, next_schedule_time, evt.handle});
+                event_queue.update(evt.handle, Event{next_time, event_fifo_id++, evt.type,
+                                                     next_schedule_time, evt.handle});
             }
         }
 
diff --git a/src/core/core_timing.h b/src/core/core_timing.h
index 21548f0a9..7e4dff7f3 100644
--- a/src/core/core_timing.h
+++ b/src/core/core_timing.h
@@ -22,17 +22,25 @@ namespace Core::Timing {
 
 /// A callback that may be scheduled for a particular core timing event.
 using TimedCallback = std::function<std::optional<std::chrono::nanoseconds>(
-    std::uintptr_t user_data, s64 time, std::chrono::nanoseconds ns_late)>;
+    s64 time, std::chrono::nanoseconds ns_late)>;
 
 /// Contains the characteristics of a particular event.
 struct EventType {
     explicit EventType(TimedCallback&& callback_, std::string&& name_)
-        : callback{std::move(callback_)}, name{std::move(name_)} {}
+        : callback{std::move(callback_)}, name{std::move(name_)}, sequence_number{0} {}
 
     /// The event's callback function.
     TimedCallback callback;
     /// A pointer to the name of the event.
     const std::string name;
+    /// A monotonic sequence number, incremented when this event is
+    /// changed externally.
+    size_t sequence_number;
+};
+
+enum class UnscheduleEventType {
+    Wait,
+    NoWait,
 };
 
 /**
@@ -89,23 +97,17 @@ public:
 
     /// Schedules an event in core timing
     void ScheduleEvent(std::chrono::nanoseconds ns_into_future,
-                       const std::shared_ptr<EventType>& event_type, std::uintptr_t user_data = 0,
-                       bool absolute_time = false);
+                       const std::shared_ptr<EventType>& event_type, bool absolute_time = false);
 
     /// Schedules an event which will automatically re-schedule itself with the given time, until
     /// unscheduled
     void ScheduleLoopingEvent(std::chrono::nanoseconds start_time,
                               std::chrono::nanoseconds resched_time,
                               const std::shared_ptr<EventType>& event_type,
-                              std::uintptr_t user_data = 0, bool absolute_time = false);
+                              bool absolute_time = false);
 
-    void UnscheduleEvent(const std::shared_ptr<EventType>& event_type, std::uintptr_t user_data,
-                         bool wait = true);
-
-    void UnscheduleEventWithoutWait(const std::shared_ptr<EventType>& event_type,
-                                    std::uintptr_t user_data) {
-        UnscheduleEvent(event_type, user_data, false);
-    }
+    void UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
+                         UnscheduleEventType type = UnscheduleEventType::Wait);
 
     void AddTicks(u64 ticks_to_add);
 
@@ -158,7 +160,6 @@ private:
     heap_t event_queue;
     u64 event_fifo_id = 0;
 
-    std::shared_ptr<EventType> ev_lost;
     Common::Event event{};
     Common::Event pause_event{};
     mutable std::mutex basic_lock;
diff --git a/src/core/hle/kernel/k_hardware_timer.cpp b/src/core/hle/kernel/k_hardware_timer.cpp
index 8e2e40307..4e947dd6b 100644
--- a/src/core/hle/kernel/k_hardware_timer.cpp
+++ b/src/core/hle/kernel/k_hardware_timer.cpp
@@ -10,15 +10,15 @@ namespace Kernel {
 
 void KHardwareTimer::Initialize() {
     // Create the timing callback to register with CoreTiming.
-    m_event_type = Core::Timing::CreateEvent(
-        "KHardwareTimer::Callback", [](std::uintptr_t timer_handle, s64, std::chrono::nanoseconds) {
-            reinterpret_cast<KHardwareTimer*>(timer_handle)->DoTask();
-            return std::nullopt;
-        });
+    m_event_type = Core::Timing::CreateEvent("KHardwareTimer::Callback",
+                                             [this](s64, std::chrono::nanoseconds) {
+                                                 this->DoTask();
+                                                 return std::nullopt;
+                                             });
 }
 
 void KHardwareTimer::Finalize() {
-    m_kernel.System().CoreTiming().UnscheduleEvent(m_event_type, reinterpret_cast<uintptr_t>(this));
+    m_kernel.System().CoreTiming().UnscheduleEvent(m_event_type);
     m_wakeup_time = std::numeric_limits<s64>::max();
     m_event_type.reset();
 }
@@ -57,13 +57,12 @@ void KHardwareTimer::EnableInterrupt(s64 wakeup_time) {
 
     m_wakeup_time = wakeup_time;
     m_kernel.System().CoreTiming().ScheduleEvent(std::chrono::nanoseconds{m_wakeup_time},
-                                                 m_event_type, reinterpret_cast<uintptr_t>(this),
-                                                 true);
+                                                 m_event_type, true);
 }
 
 void KHardwareTimer::DisableInterrupt() {
-    m_kernel.System().CoreTiming().UnscheduleEventWithoutWait(m_event_type,
-                                                              reinterpret_cast<uintptr_t>(this));
+    m_kernel.System().CoreTiming().UnscheduleEvent(m_event_type,
+                                                   Core::Timing::UnscheduleEventType::NoWait);
     m_wakeup_time = std::numeric_limits<s64>::max();
 }
 
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index c14d2d2f3..1030f0c12 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -238,7 +238,7 @@ struct KernelCore::Impl {
     void InitializePreemption(KernelCore& kernel) {
         preemption_event = Core::Timing::CreateEvent(
             "PreemptionCallback",
-            [this, &kernel](std::uintptr_t, s64 time,
+            [this, &kernel](s64 time,
                             std::chrono::nanoseconds) -> std::optional<std::chrono::nanoseconds> {
                 {
                     KScopedSchedulerLock lock(kernel);
diff --git a/src/core/hle/service/hid/hidbus.cpp b/src/core/hle/service/hid/hidbus.cpp
index d12f9beb0..ffa7e144d 100644
--- a/src/core/hle/service/hid/hidbus.cpp
+++ b/src/core/hle/service/hid/hidbus.cpp
@@ -49,10 +49,10 @@ HidBus::HidBus(Core::System& system_)
     // Register update callbacks
     hidbus_update_event = Core::Timing::CreateEvent(
         "Hidbus::UpdateCallback",
-        [this](std::uintptr_t user_data, s64 time,
+        [this](s64 time,
                std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto guard = LockService();
-            UpdateHidbus(user_data, ns_late);
+            UpdateHidbus(ns_late);
             return std::nullopt;
         });
 
@@ -61,10 +61,10 @@ HidBus::HidBus(Core::System& system_)
 }
 
 HidBus::~HidBus() {
-    system.CoreTiming().UnscheduleEvent(hidbus_update_event, 0);
+    system.CoreTiming().UnscheduleEvent(hidbus_update_event);
 }
 
-void HidBus::UpdateHidbus(std::uintptr_t user_data, std::chrono::nanoseconds ns_late) {
+void HidBus::UpdateHidbus(std::chrono::nanoseconds ns_late) {
     if (is_hidbus_enabled) {
         for (std::size_t i = 0; i < devices.size(); ++i) {
             if (!devices[i].is_device_initializated) {
diff --git a/src/core/hle/service/hid/hidbus.h b/src/core/hle/service/hid/hidbus.h
index c29b5e882..85a1df133 100644
--- a/src/core/hle/service/hid/hidbus.h
+++ b/src/core/hle/service/hid/hidbus.h
@@ -108,7 +108,7 @@ private:
     void DisableJoyPollingReceiveMode(HLERequestContext& ctx);
     void SetStatusManagerType(HLERequestContext& ctx);
 
-    void UpdateHidbus(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
+    void UpdateHidbus(std::chrono::nanoseconds ns_late);
     std::optional<std::size_t> GetDeviceIndexFromHandle(BusHandle handle) const;
 
     template <typename T>
diff --git a/src/core/hle/service/hid/resource_manager.cpp b/src/core/hle/service/hid/resource_manager.cpp
index 6c6cbd802..afc61f70d 100644
--- a/src/core/hle/service/hid/resource_manager.cpp
+++ b/src/core/hle/service/hid/resource_manager.cpp
@@ -227,8 +227,7 @@ void ResourceManager::EnableTouchScreen(u64 aruid, bool is_enabled) {
     applet_resource->EnableTouchScreen(aruid, is_enabled);
 }
 
-void ResourceManager::UpdateControllers(std::uintptr_t user_data,
-                                        std::chrono::nanoseconds ns_late) {
+void ResourceManager::UpdateControllers(std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
     debug_pad->OnUpdate(core_timing);
     digitizer->OnUpdate(core_timing);
@@ -241,20 +240,19 @@ void ResourceManager::UpdateControllers(std::uintptr_t user_data,
     capture_button->OnUpdate(core_timing);
 }
 
-void ResourceManager::UpdateNpad(std::uintptr_t user_data, std::chrono::nanoseconds ns_late) {
+void ResourceManager::UpdateNpad(std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
     npad->OnUpdate(core_timing);
 }
 
-void ResourceManager::UpdateMouseKeyboard(std::uintptr_t user_data,
-                                          std::chrono::nanoseconds ns_late) {
+void ResourceManager::UpdateMouseKeyboard(std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
     mouse->OnUpdate(core_timing);
     debug_mouse->OnUpdate(core_timing);
     keyboard->OnUpdate(core_timing);
 }
 
-void ResourceManager::UpdateMotion(std::uintptr_t user_data, std::chrono::nanoseconds ns_late) {
+void ResourceManager::UpdateMotion(std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
     six_axis->OnUpdate(core_timing);
     seven_six_axis->OnUpdate(core_timing);
@@ -273,34 +271,34 @@ IAppletResource::IAppletResource(Core::System& system_, std::shared_ptr<Resource
     // Register update callbacks
     npad_update_event = Core::Timing::CreateEvent(
         "HID::UpdatePadCallback",
-        [this, resource](std::uintptr_t user_data, s64 time, std::chrono::nanoseconds ns_late)
-            -> std::optional<std::chrono::nanoseconds> {
+        [this, resource](
+            s64 time, std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto guard = LockService();
-            resource->UpdateNpad(user_data, ns_late);
+            resource->UpdateNpad(ns_late);
             return std::nullopt;
         });
     default_update_event = Core::Timing::CreateEvent(
         "HID::UpdateDefaultCallback",
-        [this, resource](std::uintptr_t user_data, s64 time, std::chrono::nanoseconds ns_late)
-            -> std::optional<std::chrono::nanoseconds> {
+        [this, resource](
+            s64 time, std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto guard = LockService();
-            resource->UpdateControllers(user_data, ns_late);
+            resource->UpdateControllers(ns_late);
             return std::nullopt;
         });
     mouse_keyboard_update_event = Core::Timing::CreateEvent(
         "HID::UpdateMouseKeyboardCallback",
-        [this, resource](std::uintptr_t user_data, s64 time, std::chrono::nanoseconds ns_late)
-            -> std::optional<std::chrono::nanoseconds> {
+        [this, resource](
+            s64 time, std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto guard = LockService();
-            resource->UpdateMouseKeyboard(user_data, ns_late);
+            resource->UpdateMouseKeyboard(ns_late);
             return std::nullopt;
         });
     motion_update_event = Core::Timing::CreateEvent(
         "HID::UpdateMotionCallback",
-        [this, resource](std::uintptr_t user_data, s64 time, std::chrono::nanoseconds ns_late)
-            -> std::optional<std::chrono::nanoseconds> {
+        [this, resource](
+            s64 time, std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto guard = LockService();
-            resource->UpdateMotion(user_data, ns_late);
+            resource->UpdateMotion(ns_late);
             return std::nullopt;
         });
 
@@ -314,10 +312,10 @@ IAppletResource::IAppletResource(Core::System& system_, std::shared_ptr<Resource
 }
 
 IAppletResource::~IAppletResource() {
-    system.CoreTiming().UnscheduleEvent(npad_update_event, 0);
-    system.CoreTiming().UnscheduleEvent(default_update_event, 0);
-    system.CoreTiming().UnscheduleEvent(mouse_keyboard_update_event, 0);
-    system.CoreTiming().UnscheduleEvent(motion_update_event, 0);
+    system.CoreTiming().UnscheduleEvent(npad_update_event);
+    system.CoreTiming().UnscheduleEvent(default_update_event);
+    system.CoreTiming().UnscheduleEvent(mouse_keyboard_update_event);
+    system.CoreTiming().UnscheduleEvent(motion_update_event);
     resource_manager->FreeAppletResourceId(aruid);
 }
 
diff --git a/src/core/hle/service/hid/resource_manager.h b/src/core/hle/service/hid/resource_manager.h
index 5ad7cb564..5a6596099 100644
--- a/src/core/hle/service/hid/resource_manager.h
+++ b/src/core/hle/service/hid/resource_manager.h
@@ -81,10 +81,10 @@ public:
     void EnablePadInput(u64 aruid, bool is_enabled);
     void EnableTouchScreen(u64 aruid, bool is_enabled);
 
-    void UpdateControllers(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
-    void UpdateNpad(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
-    void UpdateMouseKeyboard(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
-    void UpdateMotion(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
+    void UpdateControllers(std::chrono::nanoseconds ns_late);
+    void UpdateNpad(std::chrono::nanoseconds ns_late);
+    void UpdateMouseKeyboard(std::chrono::nanoseconds ns_late);
+    void UpdateMotion(std::chrono::nanoseconds ns_late);
 
 private:
     Result CreateAppletResourceImpl(u64 aruid);
diff --git a/src/core/hle/service/nvnflinger/nvnflinger.cpp b/src/core/hle/service/nvnflinger/nvnflinger.cpp
index 6352b09a9..aa8aaa2d9 100644
--- a/src/core/hle/service/nvnflinger/nvnflinger.cpp
+++ b/src/core/hle/service/nvnflinger/nvnflinger.cpp
@@ -67,7 +67,7 @@ Nvnflinger::Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_
     // Schedule the screen composition events
     multi_composition_event = Core::Timing::CreateEvent(
         "ScreenComposition",
-        [this](std::uintptr_t, s64 time,
+        [this](s64 time,
                std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             vsync_signal.Set();
             return std::chrono::nanoseconds(GetNextTicks());
@@ -75,7 +75,7 @@ Nvnflinger::Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_
 
     single_composition_event = Core::Timing::CreateEvent(
         "ScreenComposition",
-        [this](std::uintptr_t, s64 time,
+        [this](s64 time,
                std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             const auto lock_guard = Lock();
             Compose();
@@ -93,11 +93,11 @@ Nvnflinger::Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_
 
 Nvnflinger::~Nvnflinger() {
     if (system.IsMulticore()) {
-        system.CoreTiming().UnscheduleEvent(multi_composition_event, {});
+        system.CoreTiming().UnscheduleEvent(multi_composition_event);
         vsync_thread.request_stop();
         vsync_signal.Set();
     } else {
-        system.CoreTiming().UnscheduleEvent(single_composition_event, {});
+        system.CoreTiming().UnscheduleEvent(single_composition_event);
     }
 
     ShutdownLayers();
diff --git a/src/core/memory/cheat_engine.cpp b/src/core/memory/cheat_engine.cpp
index 3fc4024dc..7bc5b5ae5 100644
--- a/src/core/memory/cheat_engine.cpp
+++ b/src/core/memory/cheat_engine.cpp
@@ -190,15 +190,15 @@ CheatEngine::CheatEngine(System& system_, std::vector<CheatEntry> cheats_,
 }
 
 CheatEngine::~CheatEngine() {
-    core_timing.UnscheduleEvent(event, 0);
+    core_timing.UnscheduleEvent(event);
 }
 
 void CheatEngine::Initialize() {
     event = Core::Timing::CreateEvent(
         "CheatEngine::FrameCallback::" + Common::HexToString(metadata.main_nso_build_id),
-        [this](std::uintptr_t user_data, s64 time,
+        [this](s64 time,
                std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
-            FrameCallback(user_data, ns_late);
+            FrameCallback(ns_late);
             return std::nullopt;
         });
     core_timing.ScheduleLoopingEvent(CHEAT_ENGINE_NS, CHEAT_ENGINE_NS, event);
@@ -239,7 +239,7 @@ void CheatEngine::Reload(std::vector<CheatEntry> reload_cheats) {
 
 MICROPROFILE_DEFINE(Cheat_Engine, "Add-Ons", "Cheat Engine", MP_RGB(70, 200, 70));
 
-void CheatEngine::FrameCallback(std::uintptr_t, std::chrono::nanoseconds ns_late) {
+void CheatEngine::FrameCallback(std::chrono::nanoseconds ns_late) {
     if (is_pending_reload.exchange(false)) {
         vm.LoadProgram(cheats);
     }
diff --git a/src/core/memory/cheat_engine.h b/src/core/memory/cheat_engine.h
index 284abdd28..ced2168d1 100644
--- a/src/core/memory/cheat_engine.h
+++ b/src/core/memory/cheat_engine.h
@@ -70,7 +70,7 @@ public:
     void Reload(std::vector<CheatEntry> reload_cheats);
 
 private:
-    void FrameCallback(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
+    void FrameCallback(std::chrono::nanoseconds ns_late);
 
     DmntCheatVm vm;
     CheatProcessMetadata metadata;
diff --git a/src/core/tools/freezer.cpp b/src/core/tools/freezer.cpp
index 98ebbbf32..9d42c726e 100644
--- a/src/core/tools/freezer.cpp
+++ b/src/core/tools/freezer.cpp
@@ -51,18 +51,17 @@ void MemoryWriteWidth(Core::Memory::Memory& memory, u32 width, VAddr addr, u64 v
 
 Freezer::Freezer(Core::Timing::CoreTiming& core_timing_, Core::Memory::Memory& memory_)
     : core_timing{core_timing_}, memory{memory_} {
-    event = Core::Timing::CreateEvent(
-        "MemoryFreezer::FrameCallback",
-        [this](std::uintptr_t user_data, s64 time,
-               std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
-            FrameCallback(user_data, ns_late);
-            return std::nullopt;
-        });
+    event = Core::Timing::CreateEvent("MemoryFreezer::FrameCallback",
+                                      [this](s64 time, std::chrono::nanoseconds ns_late)
+                                          -> std::optional<std::chrono::nanoseconds> {
+                                          FrameCallback(ns_late);
+                                          return std::nullopt;
+                                      });
     core_timing.ScheduleEvent(memory_freezer_ns, event);
 }
 
 Freezer::~Freezer() {
-    core_timing.UnscheduleEvent(event, 0);
+    core_timing.UnscheduleEvent(event);
 }
 
 void Freezer::SetActive(bool is_active) {
@@ -159,7 +158,7 @@ Freezer::Entries::const_iterator Freezer::FindEntry(VAddr address) const {
                         [address](const Entry& entry) { return entry.address == address; });
 }
 
-void Freezer::FrameCallback(std::uintptr_t, std::chrono::nanoseconds ns_late) {
+void Freezer::FrameCallback(std::chrono::nanoseconds ns_late) {
     if (!IsActive()) {
         LOG_DEBUG(Common_Memory, "Memory freezer has been deactivated, ending callback events.");
         return;
diff --git a/src/core/tools/freezer.h b/src/core/tools/freezer.h
index 0d6df5217..2efbc11f3 100644
--- a/src/core/tools/freezer.h
+++ b/src/core/tools/freezer.h
@@ -77,7 +77,7 @@ private:
     Entries::iterator FindEntry(VAddr address);
     Entries::const_iterator FindEntry(VAddr address) const;
 
-    void FrameCallback(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
+    void FrameCallback(std::chrono::nanoseconds ns_late);
     void FillEntryReads();
 
     std::atomic_bool active{false};
diff --git a/src/tests/core/core_timing.cpp b/src/tests/core/core_timing.cpp
index f08afbf9a..81898a1d3 100644
--- a/src/tests/core/core_timing.cpp
+++ b/src/tests/core/core_timing.cpp
@@ -16,20 +16,16 @@
 
 namespace {
 // Numbers are chosen randomly to make sure the correct one is given.
-constexpr std::array<u64, 5> CB_IDS{{42, 144, 93, 1026, UINT64_C(0xFFFF7FFFF7FFFF)}};
 constexpr std::array<u64, 5> calls_order{{2, 0, 1, 4, 3}};
 std::array<s64, 5> delays{};
-
-std::bitset<CB_IDS.size()> callbacks_ran_flags;
+std::bitset<5> callbacks_ran_flags;
 u64 expected_callback = 0;
 
 template <unsigned int IDX>
-std::optional<std::chrono::nanoseconds> HostCallbackTemplate(std::uintptr_t user_data, s64 time,
+std::optional<std::chrono::nanoseconds> HostCallbackTemplate(s64 time,
                                                              std::chrono::nanoseconds ns_late) {
-    static_assert(IDX < CB_IDS.size(), "IDX out of range");
+    static_assert(IDX < callbacks_ran_flags.size(), "IDX out of range");
     callbacks_ran_flags.set(IDX);
-    REQUIRE(CB_IDS[IDX] == user_data);
-    REQUIRE(CB_IDS[IDX] == CB_IDS[calls_order[expected_callback]]);
     delays[IDX] = ns_late.count();
     ++expected_callback;
     return std::nullopt;
@@ -76,7 +72,7 @@ TEST_CASE("CoreTiming[BasicOrder]", "[core]") {
         const u64 order = calls_order[i];
         const auto future_ns = std::chrono::nanoseconds{static_cast<s64>(i * one_micro + 100)};
 
-        core_timing.ScheduleEvent(future_ns, events[order], CB_IDS[order]);
+        core_timing.ScheduleEvent(future_ns, events[order]);
     }
     /// test pause
     REQUIRE(callbacks_ran_flags.none());
@@ -118,7 +114,7 @@ TEST_CASE("CoreTiming[BasicOrderNoPausing]", "[core]") {
     for (std::size_t i = 0; i < events.size(); i++) {
         const u64 order = calls_order[i];
         const auto future_ns = std::chrono::nanoseconds{static_cast<s64>(i * one_micro + 100)};
-        core_timing.ScheduleEvent(future_ns, events[order], CB_IDS[order]);
+        core_timing.ScheduleEvent(future_ns, events[order]);
     }
 
     const u64 end = core_timing.GetGlobalTimeNs().count();