ssb: Fix a crash on Windows when we would call uv_async_send on a handle that had already been closed. Various other cleanup and improvements along the journey. #96

src/ssb.h

@@ -525,6 +525,13 @@ void tf_ssb_connection_close(tf_ssb_connection_t* connection, const char* reason
 */
 bool tf_ssb_connection_is_connected(tf_ssb_connection_t* connection);
 
+/**
+** Check whether a connection is in the process of closing.
+** @param connection The connection.
+** @return True if the connection is closing.
+*/
+bool tf_ssb_connection_is_closing(tf_ssb_connection_t* connection);
+
 /**
 ** Get the next outgoing request number for a connection.
 ** @param connection The connection.