35991 2010-03-10 15:29:42 -0800 Would be faster to not use a thread specific to implement StringImpl::empty() 2010-03-10 19:53:33 -0800 1 1 1 Unclassified WebKit Platform 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 barraclough barraclough darin oldest_to_newest 198387 0 barraclough 2010-03-10 15:29:42 -0800 Copy JavaScriptCore in making 'static' strings threadsafe, make the empty string a static, shared by all threads. Change JSC::UStringImpl's implementation to match (use a static defined within the empty() method), change interface to match StringImpl (return a pointer not a reference). 198392 1 50447 barraclough 2010-03-10 15:34:54 -0800 Created attachment 50447 The patch ~0% performance impact in JSC (possible minor progression from moving empty() from .h to .cpp). ~2% progression on Dromaeo DOM core & JS lib tests. 198397 2 50447 darin 2010-03-10 15:50:26 -0800 Comment on attachment 50447 The patch r=me assuming you ran all the regression tests 198409 3 50447 ggaren 2010-03-10 16:27:50 -0800 Comment on attachment 50447 The patch Sorry -- I said r- on IRC because DEFINE_STATIC_LOCAL is not threadsafe. The solution we agreed upon was to add a call to empty() at startup, to ensure that initialization of the shared empty static occurs before any JSC or WebCore threads are created. 198412 4 darin 2010-03-10 16:32:52 -0800 (In reply to comment #3) > Sorry -- I said r- on IRC because DEFINE_STATIC_LOCAL is not threadsafe. The > solution we agreed upon was to add a call to empty() at startup, to ensure that > initialization of the shared empty static occurs before any JSC or WebCore > threads are created. WebCore has “startup” but I’m not sure JavaScriptCore does. 198430 5 50456 barraclough 2010-03-10 17:21:44 -0800 Created attachment 50456 The patch Added call to UStringImpl::empty() from initializeThreadingOnce() to ensure empty() is called in a threadsafe fashion the first time it is used. Added call to StringImpl::empty() from the ThreadGlobalData constructor, to ensure empty() has been called from the main thread before any further threads are created. 198431 6 barraclough 2010-03-10 17:22:33 -0800 Implemented fix as discussed with geoff on IRC, does anyone know a better startup hook I should be using in WebCore? 198443 7 50456 mjs 2010-03-10 18:11:32 -0800 Comment on attachment 50456 The patch r=me 198463 8 barraclough 2010-03-10 19:53:22 -0800 landed in r55825 50447 2010-03-10 15:34:54 -0800 2010-03-10 17:21:44 -0800 The patch patch.emptystatic.txt text/plain 16116 barraclough SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDU1ODEyKQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMzMgQEAKKzIwMTAtMDMtMTAgIEdhdmluIEJh cnJhY2xvdWdoICA8YmFycmFjbG91Z2hAYXBwbGUuY29tPgorCisgICAgICAgIFJldmlld2VkIGJ5 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