138155 2014-10-28 16:02:38 -0700 [iOS] WebProcess needs to take a background task assertion to prevent being killed for "suspended with locked system files" 2014-11-06 08:40:47 -0800 1 1 1 Unclassified WebKit WebKit2 528+ (Nightly build) iPhone / iPad iOS 8.1 RESOLVED FIXED InRadar P2 Normal --- 1 dbates dbates aestes andersca ap barraclough beidson ddkilzer sam thorton oldest_to_newest 1044629 0 dbates 2014-10-28 16:02:38 -0700 Towards mitigating the web content process being killed when suspended holding lock files, we should have the web content process notify the UI process when it is holding such files so that the UI process can acquire a background task assertion to allow both to continue to run for an extended period of time in the background. In particular, we want to take a background task assertion when performing a SQLite transaction(s). 1044630 1 dbates 2014-10-28 16:03:22 -0700 <rdar://problem/17939303> 1044631 2 240575 dbates 2014-10-28 16:05:50 -0700 Created attachment 240575 Patch 1044635 3 dbates 2014-10-28 16:23:20 -0700 I open to suggestions on this patch. The class WebSQLiteDatabaseTracker (included in the patch) isn't specific to iOS and hence can be used by other ports. At the time of writing, the iOS port is the only port that implements a non-trivial ProcessAssertion class to acquire a background task assertion. I guarded the instantiation of this class with PLATFORM(IOS) though I placed the class files in Source/WebKit2/WebProcess/WebCoreSupport/ (should I move them to an iOS-specific directory?) because I was unclear if it was acceptable to instantiate for all ports a WebSQLiteDatabaseTracker, which would send messages to the UIProcess (*), given that iOS is the only port that makes use of such messages. I was also unclear if we should either add a new compile-time guard for this feature to avoid the instantiation on non-iOS ports, say ENABLE_SQL_DATABASE_TRACKER, or if it's acceptable to instantiate WebSQLiteDatabaseTracker for all ports and have it only enabled for iOS (say, by not calling SQLDatabaseTracker::setClient() on non-iOS ports). Let me know if there is a preferred way to expose this functionality. (*) I didn't measure the performance implications of such messaging. 1046817 4 240575 dbates 2014-11-06 08:40:22 -0800 Comment on attachment 240575 Patch Clearing flags on attachment: 240575 Committed r175698: <http://trac.webkit.org/changeset/175698> 1046818 5 dbates 2014-11-06 08:40:26 -0800 All reviewed patches have been landed. Closing bug. 240575 2014-10-28 16:05:50 -0700 2014-11-06 08:40:22 -0800 Patch bug-138155-20141028160558.patch text/plain 17601 dbates U3VidmVyc2lvbiBSZXZpc2lvbjogMTc1MjA5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0Mi9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViS2l0Mi9DaGFuZ2VMb2cKaW5kZXggM2U2NjdlNmJjZmZmM2Zh ODAyYWIwMGQwMDdhMzRmZWIwMmQ3ZDc5NC4uYzk4ZmI0YjllNWFjYzhlNTMxZWM0MmYxNzc4MTU4 MDI5NzIyNGU1MiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYktpdDIvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJLaXQyL0NoYW5nZUxvZwpAQCAtMSwzICsxLDUwIEBACisyMDE0LTEwLTI4ICBEYW5p ZWwgQmF0ZXMgIDxkYWJhdGVzQGFwcGxlLmNvbT4KKworICAgICAgICBbaU9TXSBXZWJQcm9jZXNz IG5lZWRzIHRvIHRha2UgYSBiYWNrZ3JvdW5kIHRhc2sgYXNzZXJ0aW9uIHRvIHByZXZlbnQgYmVp bmcga2lsbGVkCisgICAgICAgIGZvciAic3VzcGVuZGVkIHdpdGggbG9ja2VkIHN5c3RlbSBmaWxl cyIKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTEzODE1 NQorICAgICAgICA8cmRhcjovL3Byb2JsZW0vMTc5MzkzMDM+CisKKyAgICAgICAgUmV2aWV3ZWQg YnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgTWl0aWdhdGVzIGFuIGlzc3VlIHdoZXJlIHRo 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