<div>Hi!</div><div><br></div><div>Trying to fix some bugs for Workers, I've got some questions about <a href="http://www.whatwg.org/specs/web-workers/current-work/#workerglobalscope">close() method on WorkerGlobalScope</a>.</div>
<div><br></div><div>In particular, the spec seems to imply that after calling close() inside the worker, the JS does not get terminated right away, but rather continue to execute, while an internal 'closing' flag is set and a message queue associated with the worker discards all the tasks, existing and future. Also, all ports are immediately disentangled.</div>
<div><br></div><div>This seems to leave some questions without explicit answer, with differences in current implementations:</div><div><br></div><div>1. Does this code in a worker continues looping until the parent page unloads:</div>
<div> ...</div><div> close();</div><div> while(true) {}</div><div><br></div><div>WebKit V8 terminates, WebKit JCS terminates after a timeout, FF does not terminate.</div><div><br></div><div>2. Do the errors propagate back to Worker object after close()?</div>
<div>...</div><div>close();</div><div>nonExistingFunction(); <<-- throws, if not processed locally, posts error info to the Worker object.</div><div><br></div><div>In WebKit and FF errors propagate, although it does not seem consistent while worker closed all the ports and is in a dormant state.</div>
<div><br></div><div>3. Should synchronous operations work after close()? Asynchronous ones perhaps should not, because of the event loop queue which is stopped...</div><div>...</div><div>close();</div><div>xhr.open("GET", "<a href="http://foo.com">foo.com</a>", <b>false</b>);</div>
<div>xhr.send();</div><div><br></div><div>WebKit: does not work (mostly), FF - does work.</div><div><br></div><div>Perhaps it would be simpler to either say nothing is executed/posted/fired after close() (immediate termination), or to enable worker run unimpeded (with ports open, etc) until it naturally yields from JS.</div>
<div><br></div><div>Any opinions?</div><div><br></div><div>Thanks,<br>Dmitry</div><div><br></div><div><br></div>