Merge pull request #11873 from AdmiralCurtiss/pause-and-lock-host

Core: Assert that only the Host thread may call PauseAndLock().

Source/Core/Core/Core.cpp

@@ -130,6 +130,7 @@ static Common::Event s_cpu_thread_job_finished;
 
 static thread_local bool tls_is_cpu_thread = false;
 static thread_local bool tls_is_gpu_thread = false;
+static thread_local bool tls_is_host_thread = false;
 
 static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi);
 
@@ -224,6 +225,11 @@ bool IsGPUThread()
   return tls_is_gpu_thread;
 }
 
+bool IsHostThread()
+{
+  return tls_is_host_thread;
+}
+
 bool WantsDeterminism()
 {
   return s_wants_determinism;
@@ -338,6 +344,16 @@ void UndeclareAsGPUThread()
   tls_is_gpu_thread = false;
 }
 
+void DeclareAsHostThread()
+{
+  tls_is_host_thread = true;
+}
+
+void UndeclareAsHostThread()
+{
+  tls_is_host_thread = false;
+}
+
 // For the CPU Thread only.
 static void CPUSetInitialExecutionState(bool force_paused = false)
 {
@@ -777,6 +793,8 @@ void SaveScreenShot(std::string_view name)
 static bool PauseAndLock(Core::System& system, bool do_lock, bool unpause_on_unlock)
 {
   // WARNING: PauseAndLock is not fully threadsafe so is only valid on the Host Thread
+  ASSERT(IsHostThread());
+
   if (!IsRunningAndStarted())
     return true;