Bug 4784

Summary:

Wrong order in calls when using setInterval and setTimeout

Product:

WebKit

Reporter:

Thomas Fuchs <thomas>

Component:

JavaScriptCore

Assignee:

Maciej Stachowiak <mjs>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

ian, joost, mrowe

Priority:

Version:

420+

Hardware:

Mac

OS:

OS X 10.4

URL:

http://mir.aculo.us/stuff/interval-test/test/functional/texteffects_test.html

Attachments:

Description	Flags
Testcase	none

Thomas Fuchs

Reported 2005-08-31 15:37:48 PDT

If multiple simultaneous calls are made to setInterval/setTimeout Safari begins to execute JavaScript in a wrong order and starts to neclect earlier setInterval intervals. See the provided URL for a test case. Click on "DropOut" by the black boxes for the most noticeable problem that is causes by this bug. For a correctly working implementation, see the URL in Firefox 1.0.X or Firefox DP 2.

Attachments
Testcase (1.99 KB, text/html) 2005-09-01 07:58 PDT, Thomas Fuchs	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Thomas Fuchs

Comment 1 2005-08-31 16:00:36 PDT

"DropOut" also works fine on the black boxes in Internet Explorer 6 on W2K.

Mark Rowe (bdash)

Comment 2 2005-08-31 23:18:23 PDT

I can see the problem that you describe, but without a significantly reduced test case it's not easy to say whether your diagnosis is accurate. Are you able to come up with a reduced test case that demonstrates the problem? http://webkit.opendarwin.org/quality/reduction.html has more info if you need it. I'm confirming this as our behaviour differs substantially from Firefox.

Thomas Fuchs

Comment 3 2005-09-01 07:58:16 PDT

Created attachment 3709 [details] Testcase This is a test case showing that Safari has wildly varying timing when setInterval is called multiple times. If I can I'll come up with an even tighter test case. Example: IntervalTimer #0: 6 iterations, avg. delta: 38.666666666666664, min: 5, max: 58 IntervalTimer #1: 6 iterations, avg. delta: 152.83333333333334, min: 5, max: 735 IntervalTimer #2: 5 iterations, avg. delta: 184.8, min: 39, max: 741 (...) IntervalTimer #13: 4 iterations, avg. delta: 40.25, min: 40, max: 41 (...) IntervalTimer #98: 4 iterations, avg. delta: 212.25, min: 35, max: 723 IntervalTimer #99: 4 iterations, avg. delta: 213.75, min: 34, max: 730 On Firefox DP 2, results are consistent: IntervalTimer #0: 11 iterations, avg. delta: 89.18181818181819, min: 77, max: 143 IntervalTimer #1: 11 iterations, avg. delta: 89.0909090909091, min: 77, max: 143 IntervalTimer #2: 11 iterations, avg. delta: 89.0909090909091, min: 77, max: 143 IntervalTimer #3: 11 iterations, avg. delta: 89, min: 77, max: 143 IntervalTimer #4: 11 iterations, avg. delta: 89.0909090909091, min: 77, max: 143 IntervalTimer #5: 11 iterations, avg. delta: 89.0909090909091, min: 77, max: 144 (...) IntervalTimer #98: 11 iterations, avg. delta: 89.45454545454545, min: 77, max: 133 IntervalTimer #99: 11 iterations, avg. delta: 89.45454545454545, min: 77, max: 133

David Kilzer (:ddkilzer)

Comment 4 2006-02-06 05:40:12 PST