Add an explicit wait to our thread wrapper

src/wine-host/utils.cpp

@@ -42,6 +42,12 @@ Win32Thread& Win32Thread::operator=(Win32Thread&& o) {
     return *this;
 }
 
+void Win32Thread::wait() {
+    if (handle) {
+        WaitForSingleObject(handle.get(), INFINITE);
+    }
+}
+
 Win32Thread::Win32Thread() : handle(nullptr, nullptr) {}
 
 Win32Timer::Win32Timer(HWND window_handle,

src/wine-host/utils.h

@@ -184,6 +184,12 @@ class Win32Thread {
     Win32Thread(Win32Thread&&);
     Win32Thread& operator=(Win32Thread&&);
 
+    /**
+     * Threads in Win32 don't join like threads on other platforms, but it may
+     * still be useful to wait for a thread to terminate.
+     */
+    void wait();
+
    private:
     /**
      * The handle for the thread that is running, will be a null pointer if this