Stop accepting sockets if Wine crashes on startup

src/plugin/plugin-bridge.h

@@ -152,6 +152,15 @@ class PluginBridge {
      */
     boost::asio::local::stream_protocol::socket vst_host_aeffect;
 
+    /**
+     * Whether we're done accepting sockets. The plugin may hang indefinitely if
+     * the Wine process fails to start, since then nothing will connect to our
+     * sockets. While we're waiting for our sockets we'll periodically poll the
+     * Wine process to see if it's still running, and terminate the socket
+     * accepting if it is not.
+     */
+    std::atomic_bool finished_accepting_sockets;
+
     /**
      * The thread that handles host callbacks.
      */