hle: kernel: Migrate KReadableEvent and KWritableEvent to KAutoObject.

src/core/hle/kernel/handle_table.cpp

@@ -54,7 +54,9 @@ ResultVal<Handle> HandleTable::Create(Object* obj) {
     case HandleType::SharedMemory:
     case HandleType::Thread:
     case HandleType::Event:
-    case HandleType::Process: {
+    case HandleType::Process:
+    case HandleType::ReadableEvent:
+    case HandleType::WritableEvent: {
         Handle handle{};
         Add(&handle, reinterpret_cast<KAutoObject*>(obj), {});
         return MakeResult<Handle>(handle);

src/core/hle/kernel/k_event.cpp

@@ -3,14 +3,13 @@
 // Refer to the license.txt file included.
 
 #include "core/hle/kernel/k_event.h"
-#include "core/hle/kernel/k_readable_event.h"
 #include "core/hle/kernel/k_resource_limit.h"
-#include "core/hle/kernel/k_writable_event.h"
 #include "core/hle/kernel/process.h"
 
 namespace Kernel {
 
-KEvent::KEvent(KernelCore& kernel) : KAutoObjectWithSlabHeapAndContainer{kernel} {}
+KEvent::KEvent(KernelCore& kernel)
+    : KAutoObjectWithSlabHeapAndContainer{kernel}, readable_event{kernel}, writable_event{kernel} {}
 
 KEvent::~KEvent() = default;
 
@@ -21,17 +20,13 @@ void KEvent::Initialize(std::string&& name_) {
     // writable events are closed this object will be destroyed.
     Open();
 
-    //// Create our sub events.
-    //KAutoObject::Create(readable_event.get());
-    //KAutoObject::Create(writable_event.get());
-
     // Create our sub events.
-    readable_event = std::make_shared<KReadableEvent>(kernel, name_ + ":Readable");
-    writable_event = std::make_shared<KWritableEvent>(kernel, name_ + ":Writable");
+    KAutoObject::Create(std::addressof(readable_event));
+    KAutoObject::Create(std::addressof(writable_event));
 
     // Initialize our sub sessions.
-    readable_event->Initialize(this);
-    writable_event->Initialize(this);
+    readable_event.Initialize(this, name_ + ":Readable");
+    writable_event.Initialize(this, name_ + ":Writable");
 
     // Set our owner process.
     owner = kernel.CurrentProcess();

src/core/hle/kernel/k_event.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include "core/hle/kernel/k_readable_event.h"
+#include "core/hle/kernel/k_writable_event.h"
 #include "core/hle/kernel/slab_helpers.h"
 
 namespace Kernel {
@@ -27,12 +29,27 @@ public:
     virtual bool IsInitialized() const override {
         return initialized;
     }
+
     virtual uintptr_t GetPostDestroyArgument() const override {
         return reinterpret_cast<uintptr_t>(owner);
     }
 
     static void PostDestroy(uintptr_t arg);
 
+    virtual Process* GetOwner() const override {
+        return owner;
+    }
+
+    KReadableEvent& GetReadableEvent() {
+        return readable_event;
+    }
+
+    KWritableEvent& GetWritableEvent() {
+        return writable_event;
+    }
+
+    // DEPRECATED
+
     std::string GetTypeName() const override {
         return "KEvent";
     }
@@ -42,25 +59,9 @@ public:
         return HANDLE_TYPE;
     }
 
-    KReadableEvent* GetReadableEvent() {
-        return readable_event.get();
-    }
-
-    std::shared_ptr<KWritableEvent>& GetWritableEvent() {
-        return writable_event;
-    }
-
-    const std::shared_ptr<KReadableEvent>& GetReadableEvent() const {
-        return readable_event;
-    }
-
-    const std::shared_ptr<KWritableEvent>& GetWritableEvent() const {
-        return writable_event;
-    }
-
 private:
-    std::shared_ptr<KReadableEvent> readable_event;
-    std::shared_ptr<KWritableEvent> writable_event;
+    KReadableEvent readable_event;
+    KWritableEvent writable_event;
     Process* owner{};
     bool initialized{};
 };

src/core/hle/kernel/k_readable_event.cpp

@@ -2,21 +2,18 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <algorithm>
 #include "common/assert.h"
-#include "common/common_funcs.h"
-#include "common/logging/log.h"
+#include "core/hle/kernel/k_event.h"
 #include "core/hle/kernel/k_readable_event.h"
 #include "core/hle/kernel/k_scheduler.h"
 #include "core/hle/kernel/k_thread.h"
 #include "core/hle/kernel/kernel.h"
-#include "core/hle/kernel/object.h"
 #include "core/hle/kernel/svc_results.h"
 
 namespace Kernel {
 
-KReadableEvent::KReadableEvent(KernelCore& kernel, std::string&& name)
-    : KSynchronizationObject{kernel, std::move(name)} {}
+KReadableEvent::KReadableEvent(KernelCore& kernel) : KSynchronizationObject{kernel} {}
+
 KReadableEvent::~KReadableEvent() = default;
 
 bool KReadableEvent::IsSignaled() const {
@@ -25,6 +22,12 @@ bool KReadableEvent::IsSignaled() const {
     return is_signaled;
 }
 
+void KReadableEvent::Destroy() {
+    if (parent) {
+        parent->Close();
+    }
+}
+
 ResultCode KReadableEvent::Signal() {
     KScopedSchedulerLock lk{kernel};
 

src/core/hle/kernel/k_readable_event.h

@@ -4,8 +4,10 @@
 
 #pragma once
 
+#include "core/hle/kernel/k_auto_object.h"
 #include "core/hle/kernel/k_synchronization_object.h"
 #include "core/hle/kernel/object.h"
+#include "core/hle/kernel/slab_helpers.h"
 #include "core/hle/result.h"
 
 namespace Kernel {
@@ -13,11 +15,32 @@ namespace Kernel {
 class KernelCore;
 class KEvent;
 
-class KReadableEvent final : public KSynchronizationObject {
+class KReadableEvent : public KSynchronizationObject {
+    KERNEL_AUTOOBJECT_TRAITS(KReadableEvent, KSynchronizationObject);
+
 public:
-    explicit KReadableEvent(KernelCore& kernel, std::string&& name);
+    explicit KReadableEvent(KernelCore& kernel);
     ~KReadableEvent() override;
 
+    void Initialize(KEvent* parent_, std::string&& name_) {
+        is_signaled = false;
+        parent = parent_;
+        name = std::move(name_);
+    }
+
+    constexpr KEvent* GetParent() const {
+        return parent;
+    }
+
+    virtual bool IsSignaled() const override;
+    virtual void Destroy() override;
+
+    ResultCode Signal();
+    ResultCode Clear();
+    ResultCode Reset();
+
+    // DEPRECATED
+
     std::string GetTypeName() const override {
         return "KReadableEvent";
     }
@@ -27,22 +50,6 @@ public:
         return HANDLE_TYPE;
     }
 
-    KEvent* GetParent() const {
-        return parent;
-    }
-
-    void Initialize(KEvent* parent_) {
-        is_signaled = false;
-        parent = parent_;
-    }
-
-    bool IsSignaled() const override;
-    void Finalize() override {}
-
-    ResultCode Signal();
-    ResultCode Clear();
-    ResultCode Reset();
-
 private:
     bool is_signaled{};
     KEvent* parent{};

src/core/hle/kernel/k_writable_event.cpp

@@ -8,20 +8,28 @@
 
 namespace Kernel {
 
-KWritableEvent::KWritableEvent(KernelCore& kernel, std::string&& name)
-    : Object{kernel, std::move(name)} {}
+KWritableEvent::KWritableEvent(KernelCore& kernel) : KAutoObjectWithSlabHeapAndContainer{kernel} {}
+
 KWritableEvent::~KWritableEvent() = default;
 
-void KWritableEvent::Initialize(KEvent* parent_) {
+void KWritableEvent::Initialize(KEvent* parent_, std::string&& name_) {
     parent = parent_;
+    name = std::move(name_);
+    parent->GetReadableEvent().Open();
 }
 
 ResultCode KWritableEvent::Signal() {
-    return parent->GetReadableEvent()->Signal();
+    return parent->GetReadableEvent().Signal();
 }
 
 ResultCode KWritableEvent::Clear() {
-    return parent->GetReadableEvent()->Clear();
+    return parent->GetReadableEvent().Clear();
+}
+
+void KWritableEvent::Destroy() {
+    // Close our references.
+    parent->GetReadableEvent().Close();
+    parent->Close();
 }
 
 } // namespace Kernel

src/core/hle/kernel/k_writable_event.h

@@ -4,7 +4,9 @@
 
 #pragma once
 
+#include "core/hle/kernel/k_auto_object.h"
 #include "core/hle/kernel/object.h"
+#include "core/hle/kernel/slab_helpers.h"
 #include "core/hle/result.h"
 
 namespace Kernel {
@@ -12,11 +14,28 @@ namespace Kernel {
 class KernelCore;
 class KEvent;
 
-class KWritableEvent final : public Object {
+class KWritableEvent final
+    : public KAutoObjectWithSlabHeapAndContainer<KWritableEvent, KAutoObjectWithList> {
+    KERNEL_AUTOOBJECT_TRAITS(KWritableEvent, KAutoObject);
+
 public:
-    explicit KWritableEvent(KernelCore& kernel, std::string&& name);
+    explicit KWritableEvent(KernelCore& kernel);
     ~KWritableEvent() override;
 
+    virtual void Destroy() override;
+
+    static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
+
+    void Initialize(KEvent* parent_, std::string&& name_);
+    ResultCode Signal();
+    ResultCode Clear();
+
+    constexpr KEvent* GetParent() const {
+        return parent;
+    }
+
+    // DEPRECATED
+
     std::string GetTypeName() const override {
         return "KWritableEvent";
     }
@@ -26,17 +45,6 @@ public:
         return HANDLE_TYPE;
     }
 
-    void Initialize(KEvent* parent_);
-
-    void Finalize() override {}
-
-    ResultCode Signal();
-    ResultCode Clear();
-
-    KEvent* GetParent() const {
-        return parent;
-    }
-
 private:
     KEvent* parent{};
 };

src/core/hle/kernel/kernel.h

@@ -40,6 +40,7 @@ class KResourceLimit;
 class KScheduler;
 class KSharedMemory;
 class KThread;
+class KWritableEvent;
 class PhysicalCore;
 class Process;
 class ServiceThread;
@@ -269,6 +270,8 @@ public:
             return slab_heap_container->shared_memory;
         } else if constexpr (std::is_same_v<T, KLinkedListNode>) {
             return slab_heap_container->linked_list_node;
+        } else if constexpr (std::is_same_v<T, KWritableEvent>) {
+            return slab_heap_container->writeable_event;
         }
     }
 
@@ -308,6 +311,7 @@ private:
         KSlabHeap<KEvent> event;
         KSlabHeap<KSharedMemory> shared_memory;
         KSlabHeap<KLinkedListNode> linked_list_node;
+        KSlabHeap<KWritableEvent> writeable_event;
     };
 
     std::unique_ptr<SlabHeapContainer> slab_heap_container;

src/core/hle/kernel/svc.cpp

@@ -1745,16 +1745,16 @@ static ResultCode ResetSignal(Core::System& system, Handle handle) {
 
     // Try to reset as readable event.
     {
-        auto readable_event = handle_table.Get<KReadableEvent>(handle);
-        if (readable_event) {
+        KScopedAutoObject readable_event = handle_table.GetObject<KReadableEvent>(handle);
+        if (readable_event.IsNotNull()) {
             return readable_event->Reset();
         }
     }
 
     // Try to reset as process.
     {
-        auto process = handle_table.Get<Process>(handle);
-        if (process) {
+        KScopedAutoObject process = handle_table.GetObject<Process>(handle);
+        if (process.IsNotNull()) {
             return process->Reset();
         }
     }
@@ -1885,27 +1885,12 @@ static ResultCode SetThreadCoreMask32(Core::System& system, Handle thread_handle
 static ResultCode SignalEvent(Core::System& system, Handle event_handle) {
     LOG_DEBUG(Kernel_SVC, "called, event_handle=0x{:08X}", event_handle);
 
-    auto& kernel = system.Kernel();
     // Get the current handle table.
-    const HandleTable& handle_table = kernel.CurrentProcess()->GetHandleTable();
-
-    // Reserve a new event from the process resource limit.
-    KScopedResourceReservation event_reservation(kernel.CurrentProcess(),
-                                                 LimitableResource::Events);
-    if (!event_reservation.Succeeded()) {
-        LOG_ERROR(Kernel, "Could not reserve a new event");
-        return ResultResourceLimitedExceeded;
-    }
+    const HandleTable& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
 
     // Get the writable event.
-    auto writable_event = handle_table.Get<KWritableEvent>(event_handle);
-    if (!writable_event) {
-        LOG_ERROR(Kernel_SVC, "Invalid event handle provided (handle={:08X})", event_handle);
-        return ResultInvalidHandle;
-    }
-
-    // Commit the successfuly reservation.
-    event_reservation.Commit();
+    KScopedAutoObject writable_event = handle_table.GetObject<KWritableEvent>(event_handle);
+    R_UNLESS(writable_event.IsNotNull(), ResultInvalidHandle);
 
     return writable_event->Signal();
 }
@@ -1922,16 +1907,16 @@ static ResultCode ClearEvent(Core::System& system, Handle event_handle) {
 
     // Try to clear the writable event.
     {
-        auto writable_event = handle_table.Get<KWritableEvent>(event_handle);
-        if (writable_event) {
+        KScopedAutoObject writable_event = handle_table.GetObject<KWritableEvent>(event_handle);
+        if (writable_event.IsNotNull()) {
             return writable_event->Clear();
         }
     }
 
     // Try to clear the readable event.
     {
-        auto readable_event = handle_table.Get<KReadableEvent>(event_handle);
-        if (readable_event) {
+        KScopedAutoObject readable_event = handle_table.GetObject<KReadableEvent>(event_handle);
+        if (readable_event.IsNotNull()) {
             return readable_event->Clear();
         }
     }
@@ -1950,7 +1935,12 @@ static ResultCode CreateEvent(Core::System& system, Handle* out_write, Handle* o
 
     // Get the kernel reference and handle table.
     auto& kernel = system.Kernel();
-    HandleTable& handle_table = kernel.CurrentProcess()->GetHandleTable();
+    auto& handle_table = kernel.CurrentProcess()->GetHandleTable();
+
+    // Reserve a new event from the process resource limit
+    KScopedResourceReservation event_reservation(kernel.CurrentProcess(),
+                                                 LimitableResource::Events);
+    R_UNLESS(event_reservation.Succeeded(), ResultResourceLimitedExceeded);
 
     // Create a new event.
     KEvent* event = KEvent::Create(kernel);
@@ -1959,22 +1949,26 @@ static ResultCode CreateEvent(Core::System& system, Handle* out_write, Handle* o
     // Initialize the event.
     event->Initialize("CreateEvent");
 
-    // Add the writable event to the handle table.
-    const auto write_create_result = handle_table.Create(event->GetWritableEvent().get());
-    if (write_create_result.Failed()) {
-        return write_create_result.Code();
-    }
-    *out_write = *write_create_result;
+    // Commit the thread reservation.
+    event_reservation.Commit();
+
+    // Ensure that we clean up the event (and its only references are handle table) on function end.
+    SCOPE_EXIT({
+        event->GetWritableEvent().Close();
+        event->GetReadableEvent().Close();
+    });
+
+    // Register the event.
+    KEvent::Register(kernel, event);
 
     // Add the writable event to the handle table.
-    auto handle_guard = SCOPE_GUARD({ handle_table.Remove(*write_create_result); });
+    R_TRY(handle_table.Add(out_write, std::addressof(event->GetWritableEvent())));
+
+    // Add the writable event to the handle table.
+    auto handle_guard = SCOPE_GUARD({ handle_table.Remove(*out_write); });
 
     // Add the readable event to the handle table.
-    const auto read_create_result = handle_table.Create(event->GetReadableEvent());
-    if (read_create_result.Failed()) {
-        return read_create_result.Code();
-    }
-    *out_read = *read_create_result;
+    R_TRY(handle_table.Add(out_read, std::addressof(event->GetReadableEvent())));
 
     // We succeeded.
     handle_guard.Cancel();

src/core/hle/service/am/am.cpp

@@ -320,7 +320,7 @@ ISelfController::ISelfController(Core::System& system_, NVFlinger::NVFlinger& nv
     Kernel::KAutoObject::Create(std::addressof(accumulated_suspended_tick_changed_event));
     accumulated_suspended_tick_changed_event.Initialize(
         "ISelfController:AccumulatedSuspendedTickChangedEvent");
-    accumulated_suspended_tick_changed_event.GetWritableEvent()->Signal();
+    accumulated_suspended_tick_changed_event.GetWritableEvent().Signal();
 }
 
 ISelfController::~ISelfController() = default;
@@ -379,7 +379,7 @@ void ISelfController::LeaveFatalSection(Kernel::HLERequestContext& ctx) {
 void ISelfController::GetLibraryAppletLaunchableEvent(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_AM, "(STUBBED) called");
 
-    launchable_event.GetWritableEvent()->Signal();
+    launchable_event.GetWritableEvent().Signal();
 
     IPC::ResponseBuilder rb{ctx, 2, 1};
     rb.Push(RESULT_SUCCESS);
@@ -592,28 +592,28 @@ AppletMessageQueue::AppletMessageQueue(Kernel::KernelCore& kernel)
 
 AppletMessageQueue::~AppletMessageQueue() = default;
 
-Kernel::KReadableEvent* AppletMessageQueue::GetMessageReceiveEvent() const {
-    return on_new_message.GetReadableEvent().get();
+Kernel::KReadableEvent& AppletMessageQueue::GetMessageReceiveEvent() {
+    return on_new_message.GetReadableEvent();
 }
 
-Kernel::KReadableEvent* AppletMessageQueue::GetOperationModeChangedEvent() const {
-    return on_operation_mode_changed.GetReadableEvent().get();
+Kernel::KReadableEvent& AppletMessageQueue::GetOperationModeChangedEvent() {
+    return on_operation_mode_changed.GetReadableEvent();
 }
 
 void AppletMessageQueue::PushMessage(AppletMessage msg) {
     messages.push(msg);
-    on_new_message.GetWritableEvent()->Signal();
+    on_new_message.GetWritableEvent().Signal();
 }
 
 AppletMessageQueue::AppletMessage AppletMessageQueue::PopMessage() {
     if (messages.empty()) {
-        on_new_message.GetWritableEvent()->Clear();
+        on_new_message.GetWritableEvent().Clear();
         return AppletMessage::NoMessage;
     }
     auto msg = messages.front();
     messages.pop();
     if (messages.empty()) {
-        on_new_message.GetWritableEvent()->Clear();
+        on_new_message.GetWritableEvent().Clear();
     }
     return msg;
 }
@@ -633,7 +633,7 @@ void AppletMessageQueue::FocusStateChanged() {
 void AppletMessageQueue::OperationModeChanged() {
     PushMessage(AppletMessage::OperationModeChanged);
     PushMessage(AppletMessage::PerformanceModeChanged);
-    on_operation_mode_changed.GetWritableEvent()->Signal();
+    on_operation_mode_changed.GetWritableEvent().Signal();
 }
 
 ICommonStateGetter::ICommonStateGetter(Core::System& system_,
@@ -930,11 +930,9 @@ private:
     void GetAppletStateChangedEvent(Kernel::HLERequestContext& ctx) {
         LOG_DEBUG(Service_AM, "called");
 
-        const auto event = applet->GetBroker().GetStateChangedEvent();
-
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushCopyObjects(event);
+        rb.PushCopyObjects(applet->GetBroker().GetStateChangedEvent());
     }
 
     void IsCompleted(Kernel::HLERequestContext& ctx) {

src/core/hle/service/am/am.h

@@ -56,8 +56,8 @@ public:
     explicit AppletMessageQueue(Kernel::KernelCore& kernel);
     ~AppletMessageQueue();
 
-    Kernel::KReadableEvent* GetMessageReceiveEvent() const;
-    Kernel::KReadableEvent* GetOperationModeChangedEvent() const;
+    Kernel::KReadableEvent& GetMessageReceiveEvent();
+    Kernel::KReadableEvent& GetOperationModeChangedEvent();
     void PushMessage(AppletMessage msg);
     AppletMessage PopMessage();
     std::size_t GetMessageCount() const;

src/core/hle/service/am/applets/applets.cpp

@@ -66,7 +66,7 @@ std::shared_ptr<IStorage> AppletDataBroker::PopNormalDataToGame() {
 
     auto out = std::move(out_channel.front());
     out_channel.pop_front();
-    pop_out_data_event.GetWritableEvent()->Clear();
+    pop_out_data_event.GetWritableEvent().Clear();
     return out;
 }
 
@@ -85,7 +85,7 @@ std::shared_ptr<IStorage> AppletDataBroker::PopInteractiveDataToGame() {
 
     auto out = std::move(out_interactive_channel.front());
     out_interactive_channel.pop_front();
-    pop_interactive_out_data_event.GetWritableEvent()->Clear();
+    pop_interactive_out_data_event.GetWritableEvent().Clear();
     return out;
 }
 
@@ -104,7 +104,7 @@ void AppletDataBroker::PushNormalDataFromGame(std::shared_ptr<IStorage>&& storag
 
 void AppletDataBroker::PushNormalDataFromApplet(std::shared_ptr<IStorage>&& storage) {
     out_channel.emplace_back(std::move(storage));
-    pop_out_data_event.GetWritableEvent()->Signal();
+    pop_out_data_event.GetWritableEvent().Signal();
 }
 
 void AppletDataBroker::PushInteractiveDataFromGame(std::shared_ptr<IStorage>&& storage) {
@@ -113,11 +113,11 @@ void AppletDataBroker::PushInteractiveDataFromGame(std::shared_ptr<IStorage>&& s
 
 void AppletDataBroker::PushInteractiveDataFromApplet(std::shared_ptr<IStorage>&& storage) {
     out_interactive_channel.emplace_back(std::move(storage));
-    pop_interactive_out_data_event.GetWritableEvent()->Signal();
+    pop_interactive_out_data_event.GetWritableEvent().Signal();
 }
 
 void AppletDataBroker::SignalStateChanged() {
-    state_changed_event.GetWritableEvent()->Signal();
+    state_changed_event.GetWritableEvent().Signal();
 
     switch (applet_mode) {
     case LibraryAppletMode::AllForeground:
@@ -141,16 +141,16 @@ void AppletDataBroker::SignalStateChanged() {
     }
 }
 
-Kernel::KReadableEvent* AppletDataBroker::GetNormalDataEvent() const {
-    return pop_out_data_event.GetReadableEvent().get();
+Kernel::KReadableEvent& AppletDataBroker::GetNormalDataEvent() {
+    return pop_out_data_event.GetReadableEvent();
 }
 
-Kernel::KReadableEvent* AppletDataBroker::GetInteractiveDataEvent() const {
-    return pop_interactive_out_data_event.GetReadableEvent().get();
+Kernel::KReadableEvent& AppletDataBroker::GetInteractiveDataEvent() {
+    return pop_interactive_out_data_event.GetReadableEvent();
 }
 
-Kernel::KReadableEvent* AppletDataBroker::GetStateChangedEvent() const {
-    return state_changed_event.GetReadableEvent().get();
+Kernel::KReadableEvent& AppletDataBroker::GetStateChangedEvent() {
+    return state_changed_event.GetReadableEvent();
 }
 
 Applet::Applet(Core::System& system_, LibraryAppletMode applet_mode_)

src/core/hle/service/am/applets/applets.h

@@ -96,11 +96,11 @@ public:
     void PushInteractiveDataFromGame(std::shared_ptr<IStorage>&& storage);
     void PushInteractiveDataFromApplet(std::shared_ptr<IStorage>&& storage);
 
-    void SignalStateChanged() const;
+    void SignalStateChanged();
 
-    Kernel::KReadableEvent* GetNormalDataEvent() const;
-    Kernel::KReadableEvent* GetInteractiveDataEvent() const;
-    Kernel::KReadableEvent* GetStateChangedEvent() const;
+    Kernel::KReadableEvent& GetNormalDataEvent();
+    Kernel::KReadableEvent& GetInteractiveDataEvent();
+    Kernel::KReadableEvent& GetStateChangedEvent();
 
 private:
     Core::System& system;

src/core/hle/service/audio/audout_u.cpp

@@ -73,7 +73,7 @@ public:
         stream = audio_core.OpenStream(system.CoreTiming(), audio_params.sample_rate,
                                        audio_params.channel_count, std::move(unique_name), [this] {
                                            const auto guard = LockService();
-                                           buffer_event.GetWritableEvent()->Signal();
+                                           buffer_event.GetWritableEvent().Signal();
                                        });
     }
 

src/core/hle/service/audio/audren_u.cpp

@@ -55,7 +55,7 @@ public:
             system.CoreTiming(), system.Memory(), audren_params,
             [this]() {
                 const auto guard = LockService();
-                system_event.GetWritableEvent()->Signal();
+                system_event.GetWritableEvent().Signal();
             },
             instance_number);
     }
@@ -289,7 +289,7 @@ private:
     void QueryAudioDeviceSystemEvent(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        buffer_event.GetWritableEvent()->Signal();
+        buffer_event.GetWritableEvent().Signal();
 
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);

src/core/hle/service/bcat/backend/backend.cpp

@@ -19,7 +19,7 @@ ProgressServiceBackend::ProgressServiceBackend(Kernel::KernelCore& kernel,
     update_event.Initialize("ProgressServiceBackend:UpdateEvent:" + std::string(event_name));
 }
 
-std::shared_ptr<Kernel::KReadableEvent> ProgressServiceBackend::GetEvent() const {
+Kernel::KReadableEvent& ProgressServiceBackend::GetEvent() {
     return update_event.GetReadableEvent();
 }
 
@@ -85,12 +85,12 @@ void ProgressServiceBackend::FinishDownload(ResultCode result) {
     SignalUpdate();
 }
 
-void ProgressServiceBackend::SignalUpdate() const {
+void ProgressServiceBackend::SignalUpdate() {
     if (need_hle_lock) {
         std::lock_guard lock(HLE::g_hle_lock);
-        update_event.GetWritableEvent()->Signal();
+        update_event.GetWritableEvent().Signal();
     } else {
-        update_event.GetWritableEvent()->Signal();
+        update_event.GetWritableEvent().Signal();
     }
 }
 

src/core/hle/service/bcat/backend/backend.h

@@ -99,10 +99,10 @@ public:
 private:
     explicit ProgressServiceBackend(Kernel::KernelCore& kernel, std::string_view event_name);
 
-    std::shared_ptr<Kernel::KReadableEvent> GetEvent() const;
+    Kernel::KReadableEvent& GetEvent();
     DeliveryCacheProgressImpl& GetImpl();
 
-    void SignalUpdate() const;
+    void SignalUpdate();
 
     DeliveryCacheProgressImpl impl{};
     Kernel::KEvent update_event;

src/core/hle/service/bcat/module.cpp

@@ -88,11 +88,9 @@ struct DeliveryCacheDirectoryEntry {
 
 class IDeliveryCacheProgressService final : public ServiceFramework<IDeliveryCacheProgressService> {
 public:
-    explicit IDeliveryCacheProgressService(Core::System& system_,
-                                           std::shared_ptr<Kernel::KReadableEvent> event_,
+    explicit IDeliveryCacheProgressService(Core::System& system_, Kernel::KReadableEvent& event_,
                                            const DeliveryCacheProgressImpl& impl_)
-        : ServiceFramework{system_, "IDeliveryCacheProgressService"}, event{std::move(event_)},
-          impl{impl_} {
+        : ServiceFramework{system_, "IDeliveryCacheProgressService"}, event{event_}, impl{impl_} {
         // clang-format off
         static const FunctionInfo functions[] = {
             {0, &IDeliveryCacheProgressService::GetEvent, "GetEvent"},
@@ -109,7 +107,7 @@ private:
 
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushCopyObjects(event.get());
+        rb.PushCopyObjects(event);
     }
 
     void GetImpl(Kernel::HLERequestContext& ctx) {
@@ -121,7 +119,7 @@ private:
         rb.Push(RESULT_SUCCESS);
     }
 
-    std::shared_ptr<Kernel::KReadableEvent> event;
+    Kernel::KReadableEvent& event;
     const DeliveryCacheProgressImpl& impl;
 };
 

src/core/hle/service/hid/controllers/npad.cpp

@@ -159,7 +159,7 @@ void Controller_NPad::InitNewlyAddedController(std::size_t controller_idx) {
     const auto controller_type = connected_controllers[controller_idx].type;
     auto& controller = shared_memory_entries[controller_idx];
     if (controller_type == NPadControllerType::None) {
-        styleset_changed_events[controller_idx]->GetWritableEvent()->Signal();
+        styleset_changed_events[controller_idx]->GetWritableEvent().Signal();
         return;
     }
     controller.style_set.raw = 0; // Zero out
@@ -959,13 +959,12 @@ bool Controller_NPad::IsVibrationDeviceMounted(const DeviceHandle& vibration_dev
     return vibration_devices_mounted[npad_index][device_index];
 }
 
-Kernel::KReadableEvent* Controller_NPad::GetStyleSetChangedEvent(u32 npad_id) const {
-    const auto& styleset_event = styleset_changed_events[NPadIdToIndex(npad_id)];
-    return styleset_event->GetReadableEvent();
+Kernel::KReadableEvent& Controller_NPad::GetStyleSetChangedEvent(u32 npad_id) {
+    return styleset_changed_events[NPadIdToIndex(npad_id)]->GetReadableEvent();
 }
 
 void Controller_NPad::SignalStyleSetChangedEvent(u32 npad_id) const {
-    styleset_changed_events[NPadIdToIndex(npad_id)]->GetWritableEvent()->Signal();
+    styleset_changed_events[NPadIdToIndex(npad_id)]->GetWritableEvent().Signal();
 }
 
 void Controller_NPad::AddNewControllerAt(NPadControllerType controller, std::size_t npad_index) {

src/core/hle/service/hid/controllers/npad.h

@@ -199,7 +199,7 @@ public:
 
     bool IsVibrationDeviceMounted(const DeviceHandle& vibration_device_handle) const;
 
-    Kernel::KReadableEvent* GetStyleSetChangedEvent(u32 npad_id) const;
+    Kernel::KReadableEvent& GetStyleSetChangedEvent(u32 npad_id);
     void SignalStyleSetChangedEvent(u32 npad_id) const;
 
     // Adds a new controller at an index.

src/core/hle/service/nfp/nfp.cpp

@@ -175,7 +175,7 @@ private:
         switch (device_state) {
         case DeviceState::TagFound:
         case DeviceState::TagNearby:
-            deactivate_event.GetWritableEvent()->Signal();
+            deactivate_event.GetWritableEvent().Signal();
             device_state = DeviceState::Initialized;
             break;
         case DeviceState::SearchingForTag:
@@ -318,7 +318,7 @@ private:
     const u32 npad_id{0};       // Player 1 controller
     State state{State::NonInitialized};
     DeviceState device_state{DeviceState::Initialized};
-    const Module::Interface& nfp_interface;
+    Module::Interface& nfp_interface;
     Kernel::KEvent deactivate_event;
     Kernel::KEvent availability_change_event;
 };
@@ -338,12 +338,12 @@ bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
     }
 
     std::memcpy(&amiibo, buffer.data(), sizeof(amiibo));
-    nfc_tag_load.GetWritableEvent()->Signal();
+    nfc_tag_load.GetWritableEvent().Signal();
     return true;
 }
 
-Kernel::KReadableEvent* Module::Interface::GetNFCEvent() const {
-    return nfc_tag_load.GetReadableEvent().get();
+Kernel::KReadableEvent& Module::Interface::GetNFCEvent() {
+    return nfc_tag_load.GetReadableEvent();
 }
 
 const Module::Interface::AmiiboFile& Module::Interface::GetAmiiboBuffer() const {

src/core/hle/service/nfp/nfp.h

@@ -39,7 +39,7 @@ public:
 
         void CreateUserInterface(Kernel::HLERequestContext& ctx);
         bool LoadAmiibo(const std::vector<u8>& buffer);
-        Kernel::KReadableEvent* GetNFCEvent() const;
+        Kernel::KReadableEvent& GetNFCEvent();
         const AmiiboFile& GetAmiiboBuffer() const;
 
     private:

src/core/hle/service/nim/nim.cpp

@@ -323,7 +323,7 @@ private:
     void StartTask(Kernel::HLERequestContext& ctx) {
         // No need to connect to the internet, just finish the task straight away.
         LOG_DEBUG(Service_NIM, "called");
-        finished_event.GetWritableEvent()->Signal();
+        finished_event.GetWritableEvent().Signal();
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
@@ -345,7 +345,7 @@ private:
 
     void Cancel(Kernel::HLERequestContext& ctx) {
         LOG_DEBUG(Service_NIM, "called");
-        finished_event.GetWritableEvent()->Clear();
+        finished_event.GetWritableEvent().Clear();
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }

src/core/hle/service/nvdrv/devices/nvhost_ctrl.cpp

@@ -108,14 +108,14 @@ NvResult nvhost_ctrl::IocCtrlEventWait(const std::vector<u8>& input, std::vector
     // This is mostly to take into account unimplemented features. As synced
     // gpu is always synced.
     if (!gpu.IsAsync()) {
-        event.event->GetWritableEvent()->Signal();
+        event.event->GetWritableEvent().Signal();
         return NvResult::Success;
     }
     auto lock = gpu.LockSync();
     const u32 current_syncpoint_value = event.fence.value;
     const s32 diff = current_syncpoint_value - params.threshold;
     if (diff >= 0) {
-        event.event->GetWritableEvent()->Signal();
+        event.event->GetWritableEvent().Signal();
         params.value = current_syncpoint_value;
         std::memcpy(output.data(), &params, sizeof(params));
         return NvResult::Success;
@@ -142,7 +142,7 @@ NvResult nvhost_ctrl::IocCtrlEventWait(const std::vector<u8>& input, std::vector
             params.value = ((params.syncpt_id & 0xfff) << 16) | 0x10000000;
         }
         params.value |= event_id;
-        event.event->GetWritableEvent()->Clear();
+        event.event->GetWritableEvent().Clear();
         gpu.RegisterSyncptInterrupt(params.syncpt_id, target_value);
         std::memcpy(output.data(), &params, sizeof(params));
         return NvResult::Timeout;

src/core/hle/service/nvdrv/interface.cpp

@@ -187,9 +187,9 @@ void NVDRV::QueryEvent(Kernel::HLERequestContext& ctx) {
     if (event_id < MaxNvEvents) {
         IPC::ResponseBuilder rb{ctx, 3, 1};
         rb.Push(RESULT_SUCCESS);
-        auto event = nvdrv->GetEvent(event_id);
-        event->Clear();
-        rb.PushCopyObjects(event.get());
+        auto& event = nvdrv->GetEvent(event_id);
+        event.Clear();
+        rb.PushCopyObjects(event);
         rb.PushEnum(NvResult::Success);
     } else {
         IPC::ResponseBuilder rb{ctx, 3};

src/core/hle/service/nvdrv/nvdrv.cpp

@@ -176,16 +176,16 @@ void Module::SignalSyncpt(const u32 syncpoint_id, const u32 value) {
         if (events_interface.assigned_syncpt[i] == syncpoint_id &&
             events_interface.assigned_value[i] == value) {
             events_interface.LiberateEvent(i);
-            events_interface.events[i].event->GetWritableEvent()->Signal();
+            events_interface.events[i].event->GetWritableEvent().Signal();
         }
     }
 }
 
-std::shared_ptr<Kernel::KReadableEvent> Module::GetEvent(const u32 event_id) const {
-    return SharedFrom(events_interface.events[event_id].event->GetReadableEvent());
+Kernel::KReadableEvent& Module::GetEvent(const u32 event_id) {
+    return events_interface.events[event_id].event->GetReadableEvent();
 }
 
-std::shared_ptr<Kernel::KWritableEvent> Module::GetEventWriteable(const u32 event_id) const {
+Kernel::KWritableEvent& Module::GetEventWriteable(const u32 event_id) {
     return events_interface.events[event_id].event->GetWritableEvent();
 }
 

src/core/hle/service/nvdrv/nvdrv.h

@@ -136,9 +136,9 @@ public:
 
     void SignalSyncpt(const u32 syncpoint_id, const u32 value);
 
-    std::shared_ptr<Kernel::KReadableEvent> GetEvent(u32 event_id) const;
+    Kernel::KReadableEvent& GetEvent(u32 event_id);
 
-    std::shared_ptr<Kernel::KWritableEvent> GetEventWriteable(u32 event_id) const;
+    Kernel::KWritableEvent& GetEventWriteable(u32 event_id);
 
 private:
     /// Manages syncpoints on the host

src/core/hle/service/nvflinger/buffer_queue.cpp

@@ -41,7 +41,7 @@ void BufferQueue::SetPreallocatedBuffer(u32 slot, const IGBPBuffer& igbp_buffer)
         .multi_fence = {},
     };
 
-    buffer_wait_event.GetWritableEvent()->Signal();
+    buffer_wait_event.GetWritableEvent().Signal();
 }
 
 std::optional<std::pair<u32, Service::Nvidia::MultiFence*>> BufferQueue::DequeueBuffer(u32 width,
@@ -119,7 +119,7 @@ void BufferQueue::CancelBuffer(u32 slot, const Service::Nvidia::MultiFence& mult
     }
     free_buffers_condition.notify_one();
 
-    buffer_wait_event.GetWritableEvent()->Signal();
+    buffer_wait_event.GetWritableEvent().Signal();
 }
 
 std::optional<std::reference_wrapper<const BufferQueue::Buffer>> BufferQueue::AcquireBuffer() {
@@ -154,7 +154,7 @@ void BufferQueue::ReleaseBuffer(u32 slot) {
     }
     free_buffers_condition.notify_one();
 
-    buffer_wait_event.GetWritableEvent()->Signal();
+    buffer_wait_event.GetWritableEvent().Signal();
 }
 
 void BufferQueue::Connect() {
@@ -169,7 +169,7 @@ void BufferQueue::Disconnect() {
         std::unique_lock lock{queue_sequence_mutex};
         queue_sequence.clear();
     }
-    buffer_wait_event.GetWritableEvent()->Signal();
+    buffer_wait_event.GetWritableEvent().Signal();
     is_connect = false;
     free_buffers_condition.notify_one();
 }
@@ -188,11 +188,11 @@ u32 BufferQueue::Query(QueryType type) {
     return 0;
 }
 
-std::shared_ptr<Kernel::KWritableEvent> BufferQueue::GetWritableBufferWaitEvent() const {
+Kernel::KWritableEvent& BufferQueue::GetWritableBufferWaitEvent() {
     return buffer_wait_event.GetWritableEvent();
 }
 
-std::shared_ptr<Kernel::KReadableEvent> BufferQueue::GetBufferWaitEvent() const {
+Kernel::KReadableEvent& BufferQueue::GetBufferWaitEvent() {
     return buffer_wait_event.GetReadableEvent();
 }
 

src/core/hle/service/nvflinger/buffer_queue.h

@@ -117,9 +117,9 @@ public:
         return is_connect;
     }
 
-    std::shared_ptr<Kernel::KWritableEvent> GetWritableBufferWaitEvent() const;
+    Kernel::KWritableEvent& GetWritableBufferWaitEvent();
 
-    std::shared_ptr<Kernel::KReadableEvent> GetBufferWaitEvent() const;
+    Kernel::KReadableEvent& GetBufferWaitEvent();
 
 private:
     BufferQueue(const BufferQueue&) = delete;

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -165,15 +165,15 @@ std::optional<u32> NVFlinger::FindBufferQueueId(u64 display_id, u64 layer_id) co
     return layer->GetBufferQueue().GetId();
 }
 
-std::shared_ptr<Kernel::KReadableEvent> NVFlinger::FindVsyncEvent(u64 display_id) {
-        const auto lock_guard = Lock();
+Kernel::KReadableEvent* NVFlinger::FindVsyncEvent(u64 display_id) {
+    const auto lock_guard = Lock();
     auto* const display = FindDisplay(display_id);
 
     if (display == nullptr) {
         return nullptr;
     }
 
-    return display->GetVSyncEvent();
+    return &display->GetVSyncEvent();
 }
 
 BufferQueue* NVFlinger::FindBufferQueue(u32 id) {

src/core/hle/service/nvflinger/nvflinger.h

@@ -73,7 +73,7 @@ public:
     /// Gets the vsync event for the specified display.
     ///
     /// If an invalid display ID is provided, then nullptr is returned.
-    [[nodiscard]] std::shared_ptr<Kernel::KReadableEvent> FindVsyncEvent(u64 display_id);
+    [[nodiscard]] Kernel::KReadableEvent* FindVsyncEvent(u64 display_id);
 
     /// Obtains a buffer queue identified by the ID.
     [[nodiscard]] BufferQueue* FindBufferQueue(u32 id);

src/core/hle/service/ptm/psm.cpp

@@ -41,19 +41,19 @@ public:
 
     void SignalChargerTypeChanged() {
         if (should_signal && should_signal_charger_type) {
-            state_change_event.GetWritableEvent()->Signal();
+            state_change_event.GetWritableEvent().Signal();
         }
     }
 
     void SignalPowerSupplyChanged() {
         if (should_signal && should_signal_power_supply) {
-            state_change_event.GetWritableEvent()->Signal();
+            state_change_event.GetWritableEvent().Signal();
         }
     }
 
     void SignalBatteryVoltageStateChanged() {
         if (should_signal && should_signal_battery_voltage) {
-            state_change_event.GetWritableEvent()->Signal();
+            state_change_event.GetWritableEvent().Signal();
         }
     }
 

src/core/hle/service/vi/display/vi_display.cpp

@@ -33,12 +33,12 @@ const Layer& Display::GetLayer(std::size_t index) const {
     return *layers.at(index);
 }
 
-std::shared_ptr<Kernel::KReadableEvent> Display::GetVSyncEvent() const {
+Kernel::KReadableEvent& Display::GetVSyncEvent() {
     return vsync_event.GetReadableEvent();
 }
 
 void Display::SignalVSyncEvent() {
-    vsync_event.GetWritableEvent()->Signal();
+    vsync_event.GetWritableEvent().Signal();
 }
 
 void Display::CreateLayer(u64 layer_id, NVFlinger::BufferQueue& buffer_queue) {

src/core/hle/service/vi/display/vi_display.h

@@ -59,7 +59,7 @@ public:
     const Layer& GetLayer(std::size_t index) const;
 
     /// Gets the readable vsync event.
-    std::shared_ptr<Kernel::KReadableEvent> GetVSyncEvent() const;
+    Kernel::KReadableEvent& GetVSyncEvent();
 
     /// Signals the internal vsync event.
     void SignalVSyncEvent();

src/core/hle/service/vi/vi.cpp

@@ -669,12 +669,10 @@ private:
 
         LOG_WARNING(Service_VI, "(STUBBED) called id={}, unknown={:08X}", id, unknown);
 
-        const auto& buffer_queue = *nv_flinger.FindBufferQueue(id);
-
         // TODO(Subv): Find out what this actually is.
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushCopyObjects(buffer_queue.GetBufferWaitEvent().get());
+        rb.PushCopyObjects(nv_flinger.FindBufferQueue(id)->GetBufferWaitEvent());
     }
 
     NVFlinger::NVFlinger& nv_flinger;
@@ -1209,7 +1207,7 @@ private:
 
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushCopyObjects(vsync_event.get());
+        rb.PushCopyObjects(vsync_event);
     }
 
     void ConvertScalingMode(Kernel::HLERequestContext& ctx) {