michael@0: this.EXPORTED_SYMBOLS = ['checkFromJSM'];
michael@0: 
michael@0: this.checkFromJSM = function checkFromJSM(ok, is, finish) {
michael@0:   let worker = new ChromeWorker("jsm_url_worker.js");
michael@0:   worker.onmessage = function(event) {
michael@0: 
michael@0:    if (event.data.type == 'finish') {
michael@0:      finish();
michael@0:     } else if (event.data.type == 'status') {
michael@0:       ok(event.data.status, event.data.msg);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   var self = this;
michael@0:   worker.onerror = function(event) {
michael@0:     is(event.target, worker);
michael@0:     ok(false, "Worker had an error: " + event.data);
michael@0:     self.worker.terminate();
michael@0:     finish();
michael@0:   };
michael@0: 
michael@0:   worker.postMessage(0);
michael@0: }