Android: Move host thread lock to a separate file

Source/Android/jni/CMakeLists.txt

@@ -10,6 +10,8 @@ add_library(main SHARED
   GameList/GameFile.cpp
   GameList/GameFile.h
   GameList/GameFileCache.cpp
+  Host.cpp
+  Host.h
   InfinityConfig.cpp
   Input/Control.cpp
   Input/Control.h

Source/Android/jni/Host.cpp

@@ -0,0 +1,8 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "jni/Host.h"
+
+#include <mutex>
+
+std::mutex HostThreadLock::s_host_identity_mutex;

Source/Android/jni/Host.h

@@ -0,0 +1,24 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <mutex>
+
+#include "Core/Core.h"
+
+// The Core only supports using a single Host thread.
+// If multiple threads want to call host functions then they need to queue
+// sequentially for access.
+struct HostThreadLock
+{
+  static std::mutex s_host_identity_mutex;
+  std::unique_lock<std::mutex> m_lock;
+
+  explicit HostThreadLock() : m_lock(s_host_identity_mutex) { Core::DeclareAsHostThread(); }
+  HostThreadLock(const HostThreadLock& other) = delete;
+  HostThreadLock(HostThreadLock&& other) = delete;
+  HostThreadLock& operator=(const HostThreadLock& other) = delete;
+  HostThreadLock& operator=(HostThreadLock&& other) = delete;
+  ~HostThreadLock() { Core::UndeclareAsHostThread(); }
+};

Source/Android/jni/MainAndroid.cpp

@@ -63,6 +63,7 @@
 
 #include "jni/AndroidCommon/AndroidCommon.h"
 #include "jni/AndroidCommon/IDCache.h"
+#include "jni/Host.h"
 
 namespace
 {
@@ -70,25 +71,6 @@ constexpr char DOLPHIN_TAG[] = "DolphinEmuNative";
 
 ANativeWindow* s_surf;
 
-// The Core only supports using a single Host thread.
-// If multiple threads want to call host functions then they need to queue
-// sequentially for access.
-std::mutex s_host_identity_lock;
-template <typename T>
-struct HostThreadWrapper
-{
-  T lock;
-
-  explicit HostThreadWrapper(auto&&... args) : lock(std::forward<decltype(args)>(args)...)
-  {
-    Core::DeclareAsHostThread();
-  }
-  HostThreadWrapper(const HostThreadWrapper& other) = delete;
-  HostThreadWrapper(HostThreadWrapper&& other) = delete;
-  HostThreadWrapper& operator=(const HostThreadWrapper& other) = delete;
-  HostThreadWrapper& operator=(HostThreadWrapper&& other) = delete;
-  ~HostThreadWrapper() { Core::UndeclareAsHostThread(); }
-};
 Common::Event s_update_main_frame_event;
 
 // This exists to prevent surfaces from being destroyed during the boot process,
@@ -263,19 +245,19 @@ extern "C" {
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_UnPauseEmulation(JNIEnv*,
                                                                                      jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   Core::SetState(Core::State::Running);
 }
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_PauseEmulation(JNIEnv*, jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   Core::SetState(Core::State::Paused);
 }
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_StopEmulation(JNIEnv*, jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   Core::Stop();
 
   // Kick the waiting event
@@ -318,7 +300,7 @@ JNIEXPORT jstring JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_GetGitRev
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SaveScreenShot(JNIEnv*, jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   Core::SaveScreenShot();
 }
 
@@ -332,7 +314,7 @@ JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SaveState(JN
                                                                               jint slot,
                                                                               jboolean wait)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   State::Save(slot, wait);
 }
 
@@ -340,21 +322,21 @@ JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SaveStateAs(
                                                                                 jstring path,
                                                                                 jboolean wait)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   State::SaveAs(GetJString(env, path), wait);
 }
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_LoadState(JNIEnv*, jclass,
                                                                               jint slot)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   State::Load(slot);
 }
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_LoadStateAs(JNIEnv* env, jclass,
                                                                                 jstring path)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   State::LoadAs(GetJString(env, path));
 }
 
@@ -383,7 +365,7 @@ Java_org_dolphinemu_dolphinemu_utils_DirectoryInitialization_SetGpuDriverDirecto
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SetUserDirectory(
     JNIEnv* env, jclass, jstring jDirectory)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   UICommon::SetUserDirectory(GetJString(env, jDirectory));
 }
 
@@ -396,7 +378,7 @@ JNIEXPORT jstring JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_GetUserDi
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SetCacheDirectory(
     JNIEnv* env, jclass, jstring jDirectory)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   File::SetUserPath(D_CACHE_IDX, GetJString(env, jDirectory));
 }
 
@@ -419,7 +401,7 @@ JNIEXPORT jint JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_GetMaxLogLev
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SetProfiling(JNIEnv*, jclass,
                                                                                  jboolean enable)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   Core::SetState(Core::State::Paused);
   auto& jit_interface = Core::System::GetInstance().GetJitInterface();
   jit_interface.ClearCache();
@@ -431,7 +413,7 @@ JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SetProfiling
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_WriteProfileResults(JNIEnv*,
                                                                                         jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   std::string filename = File::GetUserPath(D_DUMP_IDX) + "Debug/profiler.txt";
   File::CreateFullPath(filename);
   auto& jit_interface = Core::System::GetInstance().GetJitInterface();
@@ -460,14 +442,14 @@ JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_SurfaceDestr
     // If emulation continues running without a valid surface, we will probably crash,
     // so pause emulation until we get a valid surface again. EmulationFragment handles resuming.
 
-    HostThreadWrapper<std::unique_lock<std::mutex>> host_identity_guard(s_host_identity_lock);
+    HostThreadLock host_identity_guard;
 
     while (s_is_booting.IsSet())
     {
       // Need to wait for boot to finish before we can pause
-      host_identity_guard.lock.unlock();
+      host_identity_guard.m_lock.unlock();
       std::this_thread::sleep_for(std::chrono::milliseconds(1));
-      host_identity_guard.lock.lock();
+      host_identity_guard.m_lock.lock();
     }
 
     if (Core::GetState() == Core::State::Running)
@@ -501,7 +483,7 @@ JNIEXPORT jfloat JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_GetGameAsp
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_RefreshWiimotes(JNIEnv*, jclass)
 {
-  HostThreadWrapper<std::lock_guard<std::mutex>> guard(s_host_identity_lock);
+  HostThreadLock guard;
   WiimoteReal::Refresh();
 }
 
@@ -559,7 +541,7 @@ static float GetRenderSurfaceScale(JNIEnv* env)
 
 static void Run(JNIEnv* env, std::unique_ptr<BootParameters>&& boot, bool riivolution)
 {
-  HostThreadWrapper<std::unique_lock<std::mutex>> host_identity_guard(s_host_identity_lock);
+  HostThreadLock host_identity_guard;
 
   if (riivolution && std::holds_alternative<BootParameters::Disc>(boot->parameters))
   {
@@ -590,15 +572,15 @@ static void Run(JNIEnv* env, std::unique_ptr<BootParameters>&& boot, bool riivol
 
   while (Core::IsRunning())
   {
-    host_identity_guard.lock.unlock();
+    host_identity_guard.m_lock.unlock();
     s_update_main_frame_event.Wait();
-    host_identity_guard.lock.lock();
+    host_identity_guard.m_lock.lock();
     Core::HostDispatchJobs();
   }
 
   s_game_metadata_is_valid = false;
   Core::Shutdown();
-  host_identity_guard.lock.unlock();
+  host_identity_guard.m_lock.unlock();
 
   env->CallStaticVoidMethod(IDCache::GetNativeLibraryClass(),
                             IDCache::GetFinishEmulationActivity());