Working pause/resume

guacamole/libguac/include/client.h

@@ -64,6 +64,11 @@ struct guac_client {
      */
     GUACIO* io;
 
+    /**
+     * Semaphore which will be locked while I/O is owned.
+     */
+    sem_t io_lock;
+
     /**
      * Arbitrary reference to proxy client-specific data. Implementors of a
      * Guacamole proxy client can store any data they want here, which can then