14 files changed, 76 insertions, 28 deletions

diff --git a/README.md b/README.md
index 01c2da965..b47ac65bb 100755
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 yuzu emulator early access
 =============
 
-This is the source code for early-access 2623.
+This is the source code for early-access 2624.
 
 ## Legal Notice
 
diff --git a/src/core/hle/kernel/hle_ipc.cpp b/src/core/hle/kernel/hle_ipc.cpp
index 42d1b0e31..90e0662cf 100755
--- a/src/core/hle/kernel/hle_ipc.cpp
+++ b/src/core/hle/kernel/hle_ipc.cpp
@@ -24,8 +24,15 @@
 
 namespace Kernel {
 
-SessionRequestHandler::SessionRequestHandler(KernelCore& kernel_, const char* service_name_)
-    : kernel{kernel_}, service_thread{kernel.CreateServiceThread(service_name_)} {}
+SessionRequestHandler::SessionRequestHandler(KernelCore& kernel_, const char* service_name_,
+                                             bool create_service_thread_)
+    : kernel{kernel_} {
+    if (create_service_thread_) {
+        service_thread = kernel.CreateServiceThread(service_name_);
+    } else {
+        service_thread = kernel.GetDefaultServiceThread();
+    }
+}
 
 SessionRequestHandler::~SessionRequestHandler() {
     kernel.ReleaseServiceThread(service_thread);
diff --git a/src/core/hle/kernel/hle_ipc.h b/src/core/hle/kernel/hle_ipc.h
index 670cc741c..07ce83ab4 100755
--- a/src/core/hle/kernel/hle_ipc.h
+++ b/src/core/hle/kernel/hle_ipc.h
@@ -57,7 +57,8 @@ enum class ThreadWakeupReason;
  */
 class SessionRequestHandler : public std::enable_shared_from_this<SessionRequestHandler> {
 public:
-    SessionRequestHandler(KernelCore& kernel, const char* service_name_);
+    SessionRequestHandler(KernelCore& kernel_, const char* service_name_,
+                          bool create_service_thread_);
     virtual ~SessionRequestHandler();
 
     /**
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index df05f5ddb..763e83187 100755
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -61,6 +61,7 @@ struct KernelCore::Impl {
         global_scheduler_context = std::make_unique<Kernel::GlobalSchedulerContext>(kernel);
         global_handle_table = std::make_unique<Kernel::KHandleTable>(kernel);
         global_handle_table->Initialize(KHandleTable::MaxTableSize);
+        default_service_thread = CreateServiceThread(kernel, "DefaultServiceThread");
 
         is_phantom_mode_for_singlecore = false;
 
@@ -686,6 +687,12 @@ struct KernelCore::Impl {
 
     void ReleaseServiceThread(std::weak_ptr<Kernel::ServiceThread> service_thread) {
         if (auto strong_ptr = service_thread.lock()) {
+            if (strong_ptr == default_service_thread.lock()) {
+                // Nothing to do here, the service is using default_service_thread, which will be
+                // released on shutdown.
+                return;
+            }
+
             service_threads_manager.QueueWork(
                 [this, strong_ptr{std::move(strong_ptr)}]() { service_threads.erase(strong_ptr); });
         }
@@ -749,7 +756,8 @@ struct KernelCore::Impl {
     std::unique_ptr<KMemoryLayout> memory_layout;
 
     // Threads used for services
-    std::unordered_set<std::shared_ptr<Kernel::ServiceThread>> service_threads;
+    std::unordered_set<std::shared_ptr<ServiceThread>> service_threads;
+    std::weak_ptr<ServiceThread> default_service_thread;
     Common::ThreadWorker service_threads_manager;
 
     std::array<KThread*, Core::Hardware::NUM_CPU_CORES> suspend_threads;
@@ -1083,6 +1091,10 @@ std::weak_ptr<Kernel::ServiceThread> KernelCore::CreateServiceThread(const std::
     return impl->CreateServiceThread(*this, name);
 }
 
+std::weak_ptr<Kernel::ServiceThread> KernelCore::GetDefaultServiceThread() {
+    return impl->default_service_thread;
+}
+
 void KernelCore::ReleaseServiceThread(std::weak_ptr<Kernel::ServiceThread> service_thread) {
     impl->ReleaseServiceThread(service_thread);
 }
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 0757d74a7..77901e5a9 100755
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -277,9 +277,11 @@ public:
     void ExitSVCProfile();
 
     /**
-     * Creates an HLE service thread, which are used to execute service routines asynchronously.
-     * While these are allocated per ServerSession, these need to be owned and managed outside
-     * of ServerSession to avoid a circular dependency.
+     * Creates a host thread to execute HLE service requests, which are used to execute service
+     * routines asynchronously. While these are allocated per ServerSession, these need to be owned
+     * and managed outside of ServerSession to avoid a circular dependency. In general, most
+     * services can just use the default service thread, and not need their own host service thread.
+     * See GetDefaultServiceThread.
      * @param name String name for the ServerSession creating this thread, used for debug
      * purposes.
      * @returns The a weak pointer newly created service thread.
@@ -287,6 +289,14 @@ public:
     std::weak_ptr<Kernel::ServiceThread> CreateServiceThread(const std::string& name);
 
     /**
+     * Gets the default host service thread, which executes HLE service requests. Unless service
+     * requests need to block on the host, the default service thread should be used in favor of
+     * creating a new service thread.
+     * @returns The a weak pointer for the default service thread.
+     */
+    std::weak_ptr<Kernel::ServiceThread> GetDefaultServiceThread();
+
+    /**
      * Releases a HLE service thread, instructing KernelCore to free it. This should be called when
      * the ServerSession associated with the thread is destroyed.
      * @param service_thread Service thread to release.
diff --git a/src/core/hle/service/audio/audout_u.cpp b/src/core/hle/service/audio/audout_u.cpp
index affa7971c..834ac14ca 100755
--- a/src/core/hle/service/audio/audout_u.cpp
+++ b/src/core/hle/service/audio/audout_u.cpp
@@ -41,9 +41,10 @@ public:
     explicit IAudioOut(Core::System& system_, AudoutParams audio_params_,
                        AudioCore::AudioOut& audio_core_, std::string&& device_name_,
                        std::string&& unique_name)
-        : ServiceFramework{system_, "IAudioOut"}, audio_core{audio_core_},
-          device_name{std::move(device_name_)}, audio_params{audio_params_},
-          main_memory{system.Memory()}, service_context{system_, "IAudioOut"} {
+        : ServiceFramework{system_, "IAudioOut", true /*create_service_thread*/},
+          audio_core{audio_core_}, device_name{std::move(device_name_)},
+          audio_params{audio_params_}, main_memory{system.Memory()}, service_context{system_,
+                                                                                     "IAudioOut"} {
         // clang-format off
         static const FunctionInfo functions[] = {
             {0, &IAudioOut::GetAudioOutState, "GetAudioOutState"},
diff --git a/src/core/hle/service/audio/audren_u.cpp b/src/core/hle/service/audio/audren_u.cpp
index f45e5cecc..8df874fcf 100755
--- a/src/core/hle/service/audio/audren_u.cpp
+++ b/src/core/hle/service/audio/audren_u.cpp
@@ -24,7 +24,8 @@ public:
     explicit IAudioRenderer(Core::System& system_,
                             const AudioCommon::AudioRendererParameter& audren_params,
                             const std::size_t instance_number)
-        : ServiceFramework{system_, "IAudioRenderer"}, service_context{system_, "IAudioRenderer"} {
+        : ServiceFramework{system_, "IAudioRenderer", true /*create_service_thread*/},
+          service_context{system_, "IAudioRenderer"} {
         // clang-format off
         static const FunctionInfo functions[] = {
             {0, &IAudioRenderer::GetSampleRate, "GetSampleRate"},
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp_srv.cpp
index b087e7bba..9feccfbb8 100755
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp_srv.cpp
@@ -58,7 +58,8 @@ enum class FileSystemType : u8 {
 class IStorage final : public ServiceFramework<IStorage> {
 public:
     explicit IStorage(Core::System& system_, FileSys::VirtualFile backend_)
-        : ServiceFramework{system_, "IStorage"}, backend(std::move(backend_)) {
+        : ServiceFramework{system_, "IStorage", true /*create_service_thread*/},
+          backend(std::move(backend_)) {
         static const FunctionInfo functions[] = {
             {0, &IStorage::Read, "Read"},
             {1, nullptr, "Write"},
@@ -116,7 +117,8 @@ private:
 class IFile final : public ServiceFramework<IFile> {
 public:
     explicit IFile(Core::System& system_, FileSys::VirtualFile backend_)
-        : ServiceFramework{system_, "IFile"}, backend(std::move(backend_)) {
+        : ServiceFramework{system_, "IFile", true /*create_service_thread*/},
+          backend(std::move(backend_)) {
         static const FunctionInfo functions[] = {
             {0, &IFile::Read, "Read"},
             {1, &IFile::Write, "Write"},
@@ -252,7 +254,8 @@ static void BuildEntryIndex(std::vector<FileSys::Entry>& entries, const std::vec
 class IDirectory final : public ServiceFramework<IDirectory> {
 public:
     explicit IDirectory(Core::System& system_, FileSys::VirtualDir backend_)
-        : ServiceFramework{system_, "IDirectory"}, backend(std::move(backend_)) {
+        : ServiceFramework{system_, "IDirectory", true /*create_service_thread*/},
+          backend(std::move(backend_)) {
         static const FunctionInfo functions[] = {
             {0, &IDirectory::Read, "Read"},
             {1, &IDirectory::GetEntryCount, "GetEntryCount"},
@@ -308,8 +311,8 @@ private:
 class IFileSystem final : public ServiceFramework<IFileSystem> {
 public:
     explicit IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_)
-        : ServiceFramework{system_, "IFileSystem"}, backend{std::move(backend_)}, size{std::move(
-                                                                                      size_)} {
+        : ServiceFramework{system_, "IFileSystem", true /*create_service_thread*/},
+          backend{std::move(backend_)}, size{std::move(size_)} {
         static const FunctionInfo functions[] = {
             {0, &IFileSystem::CreateFile, "CreateFile"},
             {1, &IFileSystem::DeleteFile, "DeleteFile"},
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index 8a2635ee4..9d3e0a658 100755
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -879,6 +879,10 @@ void Hid::AcquireNpadStyleSetUpdateEventHandle(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_HID, "called, npad_id={}, applet_resource_user_id={}, unknown={}",
               parameters.npad_id, parameters.applet_resource_user_id, parameters.unknown);
 
+    // Games expect this event to be signaled after calling this function
+    applet_resource->GetController<Controller_NPad>(HidController::NPad)
+        .SignalStyleSetChangedEvent(parameters.npad_id);
+
     IPC::ResponseBuilder rb{ctx, 2, 1};
     rb.Push(ResultSuccess);
     rb.PushCopyObjects(applet_resource->GetController<Controller_NPad>(HidController::NPad)
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index ab3286db9..04eb0d6ea 100755
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -91,9 +91,11 @@ namespace Service {
 }
 
 ServiceFrameworkBase::ServiceFrameworkBase(Core::System& system_, const char* service_name_,
-                                           u32 max_sessions_, InvokerFn* handler_invoker_)
-    : SessionRequestHandler(system_.Kernel(), service_name_), system{system_},
-      service_name{service_name_}, max_sessions{max_sessions_}, handler_invoker{handler_invoker_} {}
+                                           bool create_service_thread_, u32 max_sessions_,
+                                           InvokerFn* handler_invoker_)
+    : SessionRequestHandler(system_.Kernel(), service_name_, create_service_thread_),
+      system{system_}, service_name{service_name_}, max_sessions{max_sessions_},
+      handler_invoker{handler_invoker_} {}
 
 ServiceFrameworkBase::~ServiceFrameworkBase() {
     // Wait for other threads to release access before destroying
diff --git a/src/core/hle/service/service.h b/src/core/hle/service/service.h
index b9ab2c465..778b6da4e 100755
--- a/src/core/hle/service/service.h
+++ b/src/core/hle/service/service.h
@@ -114,7 +114,8 @@ private:
                            Kernel::HLERequestContext& ctx);
 
     explicit ServiceFrameworkBase(Core::System& system_, const char* service_name_,
-                                  u32 max_sessions_, InvokerFn* handler_invoker_);
+                                  bool create_service_thread_, u32 max_sessions_,
+                                  InvokerFn* handler_invoker_);
     ~ServiceFrameworkBase() override;
 
     void RegisterHandlersBase(const FunctionInfoBase* functions, std::size_t n);
@@ -176,14 +177,18 @@ protected:
     /**
      * Initializes the handler with no functions installed.
      *
-     * @param system_       The system context to construct this service under.
+     * @param system_ The system context to construct this service under.
      * @param service_name_ Name of the service.
-     * @param max_sessions_ Maximum number of sessions that can be
-     *                      connected to this service at the same time.
+     * @param create_service_thread_ Creates a service thread for this if true, otherwise use the
+     * default service thread.
+     * @param max_sessions_ Maximum number of sessions that can be connected to this service at the
+     * same time.
      */
     explicit ServiceFramework(Core::System& system_, const char* service_name_,
+                              bool create_service_thread_ = false,
                               u32 max_sessions_ = ServerSessionCountMax)
-        : ServiceFrameworkBase(system_, service_name_, max_sessions_, Invoker) {}
+        : ServiceFrameworkBase(system_, service_name_, create_service_thread_, max_sessions_,
+                               Invoker) {}
 
     /// Registers handlers in the service.
     template <std::size_t N>
diff --git a/src/core/hle/service/sm/sm.cpp b/src/core/hle/service/sm/sm.cpp
index 695a1faa6..5233e5b33 100755
--- a/src/core/hle/service/sm/sm.cpp
+++ b/src/core/hle/service/sm/sm.cpp
@@ -206,7 +206,7 @@ void SM::UnregisterService(Kernel::HLERequestContext& ctx) {
 }
 
 SM::SM(ServiceManager& service_manager_, Core::System& system_)
-    : ServiceFramework{system_, "sm:", 4},
+    : ServiceFramework{system_, "sm:", false /*create_service_thread*/, 4},
       service_manager{service_manager_}, kernel{system_.Kernel()} {
     RegisterHandlers({
         {0, &SM::Initialize, "Initialize"},
diff --git a/src/core/hle/service/sockets/bsd.cpp b/src/core/hle/service/sockets/bsd.cpp
index fc93fb743..3970879c8 100755
--- a/src/core/hle/service/sockets/bsd.cpp
+++ b/src/core/hle/service/sockets/bsd.cpp
@@ -837,7 +837,8 @@ void BSD::BuildErrnoResponse(Kernel::HLERequestContext& ctx, Errno bsd_errno) co
     rb.PushEnum(bsd_errno);
 }
 
-BSD::BSD(Core::System& system_, const char* name) : ServiceFramework{system_, name} {
+BSD::BSD(Core::System& system_, const char* name)
+    : ServiceFramework{system_, name, true /*create_service_thread*/} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, &BSD::RegisterClient, "RegisterClient"},
diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index 430cbc546..3284de519 100755
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -77,7 +77,8 @@ static_assert(sizeof(NativeWindow) == 0x28, "NativeWindow has wrong size");
 class IHOSBinderDriver final : public ServiceFramework<IHOSBinderDriver> {
 public:
     explicit IHOSBinderDriver(Core::System& system_, NVFlinger::HosBinderDriverServer& server_)
-        : ServiceFramework{system_, "IHOSBinderDriver"}, server(server_) {
+        : ServiceFramework{system_, "IHOSBinderDriver", true /*create_service_thread*/},
+          server(server_) {
         static const FunctionInfo functions[] = {
             {0, &IHOSBinderDriver::TransactParcel, "TransactParcel"},
             {1, &IHOSBinderDriver::AdjustRefcount, "AdjustRefcount"},