Use nogvl_dbsqlok

Author: andyundso

ext/tiny_tds/client.c

@@ -305,10 +305,10 @@ static VALUE rb_tinytds_execute(VALUE self, VALUE sql) {
   if (cwrap->userdata->dbsql_sent) {
     // if we do not run dbsqlok, FreeTDS will throw an error
     // Attempt to initiate a new Adaptive Server operation with results pending
-    // note that both of these operations are blocking as we do not have access to these
-    // "NOGVL" methods from result.c
     if (cwrap->userdata->dbsqlok_sent == 0) {
-      dbsqlok(cwrap->client);
+      if(nogvl_dbsqlok(cwrap->client) != SUCCEED) {
+        rb_raise(cTinyTdsError, "unable to acknowledge previous results with server");
+      }
     }
 
     dbcancel(cwrap->client);