SaveStates: Fix Gem Thread Reboot

Utilities/Thread.cpp

@@ -106,6 +106,11 @@ thread_local u64 g_tls_wait_fail = 0;
 thread_local bool g_tls_access_violation_recovered = false;
 extern thread_local std::string(*g_tls_log_prefix)();
 
+namespace stx
+{
+	atomic_t<u32> g_launch_retainer{0};
+}
+
 // Report error and call std::abort(), defined in main.cpp
 [[noreturn]] void report_fatal_error(std::string_view text, bool is_html = false, bool include_help_text = true);
 

Utilities/Thread.h

@@ -465,6 +465,8 @@ public:
 namespace stx
 {
 	struct launch_retainer;
+
+	extern atomic_t<u32> g_launch_retainer;
 }
 
 // Derived from the callable object Context, possibly a lambda
@@ -481,6 +483,11 @@ class named_thread final : public Context, result_storage<Context>, thread_base
 
 	u64 entry_point2()
 	{
+		while (u32 value = stx::g_launch_retainer)
+		{
+			stx::g_launch_retainer.wait(value);
+		}
+
 		thread::initialize([]()
 		{
 			if constexpr (!result::empty)