64337 2011-07-11 18:57:17 -0700 [EFL] Refactor scheduleDispatchFunctionsOnMainThread to fix crash. 2011-07-17 19:59:07 -0700 1 1 1 Unclassified WebKit WebKit EFL 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 64515 1 ryuan.choi ryuan.choi gyuyoung.kim gyuyoung.kim leandro lucas.de.marchi rakuco webkit.review.bot oldest_to_newest 435407 0 ryuan.choi 2011-07-11 18:57:17 -0700 When ecore_timer_add is called in child thread, it worked well. It's because ecore doesn't check where ecore_timer_add is called, although ecore_timer_add should be called in main thread. However, some checks were introduced at (E svn r61041) and I got below error messages. CRI<27517>: ecore_thread.c:859 _ecore_thread_assert_main_loop_thread() Call to ecore_timer_add from wrong thread! Program received signal SIGABRT, Aborted. [Switching to Thread 0xb6765b70 (LWP 27521)] 0x00110832 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 (gdb) 435409 1 100414 ryuan.choi 2011-07-11 19:04:44 -0700 Created attachment 100414 Patch 435467 2 gyuyoung.kim 2011-07-11 21:04:27 -0700 In latest ecore library, there is same crash on EWebLauncher. CRI<1406>: ecore_thread.c:869 _ecore_thread_assert_main_loop_thread() Call to ecore_timer_add from wrong thread! Aborted I look over this patch. It looks good to me. 435627 3 rakuco 2011-07-12 07:08:52 -0700 The weird part to me is that ecore_time_add is currently called from a method named scheduleDispatchFunctionsOnMainThread, so it should be called from the main thread. If you get a backtrace when the assert in ecore is hit, where is scheduleDispatchFunctionsOnMainThread currently being called? 436030 4 ryuan.choi 2011-07-12 15:39:58 -0700 (In reply to comment #3) > The weird part to me is that ecore_time_add is currently called from a method named scheduleDispatchFunctionsOnMainThread, so it should be called from the main thread. > > If you get a backtrace when the assert in ecore is hit, where is scheduleDispatchFunctionsOnMainThread currently being called? scheduleDispatchFunctionsOnMainThread is called in child thread. So, we should change it to prevent assert. (gdb) bt #0 0x00110832 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 #1 0x021ca651 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 #2 0x021cda82 in *__GI_abort () at abort.c:92 #3 0x002f61cf in _ecore_thread_assert_main_loop_thread (function=0x2fd0b8 "ecore_timer_add") at ecore_thread.c:860 #4 0x002f46d3 in ecore_timer_add (in=0, func=0x1886240 <WTF::timeoutFired(void*)>, data=0x0) at ecore_timer.c:144 #5 0x0188629e in WTF::scheduleDispatchFunctionsOnMainThread() () from /workspace/webkits/efl-webkit/WebKitBuild/Release/WebKit/libewebkit.so.0 #6 0x01866e62 in WTF::callOnMainThread(void (*)(void*), void*) () from /workspace/webkits/efl-webkit/WebKitBuild/Release/WebKit/libewebkit.so.0 #7 0x009c6a74 in WebCore::IconDatabase::performURLImport() () from /workspace/webkits/efl-webkit/WebKitBuild/Release/WebKit/libewebkit.so.0 #8 0x009c86a8 in WebCore::IconDatabase::iconDatabaseSyncThread() () from /workspace/webkits/efl-webkit/WebKitBuild/Release/WebKit/libewebkit.so.0 #9 0x01868c0f in WTF::threadEntryPoint(void*) () from /workspace/webkits/efl-webkit/WebKitBuild/Release/WebKit/libewebkit.so.0 #10 0x01ceb96e in start_thread (arg=0xb6765b70) at pthread_create.c:300 #11 0x0226da4e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130 436052 5 100414 leandro 2011-07-12 16:19:41 -0700 Comment on attachment 100414 Patch I don't like this approach. This will constantly wake the process up (every time the main loop is idle) to check a flag and sleep again. 436060 6 ryuan.choi 2011-07-12 16:29:14 -0700 (In reply to comment #5) > (From update of attachment 100414 [details]) > I don't like this approach. This will constantly wake the process up (every time the main loop is idle) to check a flag and sleep again. I agree. we need better idea if possible. Does we have any good alternative to wake main_thread in child thread? 436111 7 100596 ryuan.choi 2011-07-12 17:32:45 -0700 Created attachment 100596 pipe_approach 436130 8 100596 leandro 2011-07-12 18:06:07 -0700 Comment on attachment 100596 pipe_approach View in context: https://bugs.webkit.org/attachment.cgi?id=100596&action=review This looks better, but I'm not familiar with Ecore_Pipe; I'll check the documentation (and code) tomorrow and do a proper informal review. In the meantime, informal r- for the reasons below. > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:43 > +static void deletePipe(); > +static Ecore_Pipe* pipe; You could implement the needed OwnPtrEfl function for Ecore_Pipe, and get rid of deletePipe() (and the associated atexit() call below). Also, you should use a better name than simply "pipe". 436208 9 100617 ryuan.choi 2011-07-12 20:41:53 -0700 Created attachment 100617 pipe_approach2 436210 10 webkit.review.bot 2011-07-12 20:44:35 -0700 Attachment 100617 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1 Source/JavaScriptCore/wtf/OwnPtrCommon.h:56: Ecore_Pipe is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Total errors found: 1 in 4 files If any of these errors are false positives, please file a bug against check-webkit-style. 436213 11 ryuan.choi 2011-07-12 20:52:27 -0700 The style bot complained about some struct names, but they are false positives. (In reply to comment #8) > (From update of attachment 100596 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=100596&action=review > > This looks better, but I'm not familiar with Ecore_Pipe; I'll check the documentation (and code) tomorrow and do a proper informal review. In the meantime, informal r- for the reasons below. > > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:43 > > +static void deletePipe(); > > +static Ecore_Pipe* pipe; > > You could implement the needed OwnPtrEfl function for Ecore_Pipe, and get rid of deletePipe() (and the associated atexit() call below). Also, you should use a better name than simply "pipe". I fixed almost what you mentioned. but I can't give good name for "pipe" Now I just changed it to "pipeObject" 436214 12 100617 gyuyoung.kim 2011-07-12 20:55:43 -0700 Comment on attachment 100617 pipe_approach2 View in context: https://bugs.webkit.org/attachment.cgi?id=100617&action=review >> Source/JavaScriptCore/wtf/OwnPtrCommon.h:56 >> +typedef struct _Ecore_Pipe Ecore_Pipe; > > Ecore_Pipe is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] I think we need to let style checker not check "readability/naming rule". However, we are obliged to ignore this style error because this file is common file. Existed codes already have same style error. ~/webkit/WebKit$ Tools/Scripts/check-webkit-style Source/JavaScriptCore/wtf/OwnPtrCommon.h Source/JavaScriptCore/wtf/OwnPtrCommon.h:54: Ecore_Evas is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/wtf/OwnPtrCommon.h:55: Evas_Object is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] 436415 13 rakuco 2011-07-13 07:06:45 -0700 Doesn't it make more sense to put the OwnPtr stuff in a separate patch? I think it's easier for it to get reviewed and integrated. >>> Source/JavaScriptCore/wtf/OwnPtrCommon.h:56 >>> +typedef struct _Ecore_Pipe Ecore_Pipe; BTW, I'd rather keep these typedefs sorted alphabetically (here, below and in the implementation). 437354 14 100871 ryuan.choi 2011-07-14 15:11:10 -0700 Created attachment 100871 Patch 437796 15 rakuco 2011-07-15 09:35:49 -0700 > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:43 > +static Eina_Bool timeoutFired(void*); Why not implement it here and save one declaration? > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:44 > +static OwnPtr<Ecore_Pipe> pipeObject; Hmm, I've got some reservations with this idiom. It is creating a global static non-POD object, so its destructor will be called after the program finishes, and in an undefined order. If your main() calls ecore_shutdown(), pipeObject's destructor will call ecore_pipe_del() after ecore_shutdown() has been called. In this case, what I can see that people sometimes do is use the DEFINE_STATIC_LOCAL macro: the pointer will end up being leaked, but as it is only one object that will stay alive during the whole lifetime of the program people don't seem to care much. > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:48 > + ecore_timer_add(0, timeoutFired, 0); Is it necessary to have both a timer and a pipe or could monitorDispatchFunctions() call dispatchFunctionsFromMainThread() right away? > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:-45 > -static Eina_Bool timeoutFired(void*) Why? 438100 16 101082 ryuan.choi 2011-07-15 18:30:55 -0700 Created attachment 101082 Patch 438102 17 ryuan.choi 2011-07-15 18:35:28 -0700 (In reply to comment #15) > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:43 > > +static Eina_Bool timeoutFired(void*); > > Why not implement it here and save one declaration? > > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:44 > > +static OwnPtr<Ecore_Pipe> pipeObject; > > Hmm, I've got some reservations with this idiom. > > It is creating a global static non-POD object, so its destructor will be called after the program finishes, and in an undefined order. If your main() calls ecore_shutdown(), pipeObject's destructor will call ecore_pipe_del() after ecore_shutdown() has been called. > > In this case, what I can see that people sometimes do is use the DEFINE_STATIC_LOCAL macro: the pointer will end up being leaked, but as it is only one object that will stay alive during the whole lifetime of the program people don't seem to care much. > Thank you for your comment. You make me and this patch smarter. I tried like you mentioned. > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:48 > > + ecore_timer_add(0, timeoutFired, 0); > > Is it necessary to have both a timer and a pipe or could monitorDispatchFunctions() call dispatchFunctionsFromMainThread() right away? > > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:-45 > > -static Eina_Bool timeoutFired(void*) > > Why? I don't know why I can't catch it. You're right. It's stupid. I fixed. 438228 18 rakuco 2011-07-16 18:27:25 -0700 > Source/JavaScriptCore/ChangeLog:8 > + but in a main thread. "the" main thread, as there is only one. > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:44 > +DEFINE_STATIC_LOCAL(OwnPtr<Ecore_Pipe>, pipeObject, ()); The usual idiom is to use this inside a function (see, for example, wtf/gtk/ThreadingGtk.cpp or, for something which looks like what you will have to do here, WebCore/dom/UserTypingGestureIndicator.cpp). 438232 19 101110 ryuan.choi 2011-07-16 19:01:18 -0700 Created attachment 101110 Patch 438233 20 ryuan.choi 2011-07-16 19:05:24 -0700 (In reply to comment #18) > > Source/JavaScriptCore/ChangeLog:8 > > + but in a main thread. > > "the" main thread, as there is only one. fixed. > > > Source/JavaScriptCore/wtf/efl/MainThreadEfl.cpp:44 > > +DEFINE_STATIC_LOCAL(OwnPtr<Ecore_Pipe>, pipeObject, ()); > > The usual idiom is to use this inside a function (see, for example, wtf/gtk/ThreadingGtk.cpp or, for something which looks like what you will have to do here, WebCore/dom/UserTypingGestureIndicator.cpp). Although I didn't understand fully, I prepared new patch like you mentioned. Thanks. 438247 21 rakuco 2011-07-16 21:54:53 -0700 LGTM, informal r+. (In reply to comment #20) > Although I didn't understand fully, > I prepared new patch like you mentioned. > Thanks. What part was not clear? Technically speaking, the only difference between the last two patches is that the object only gets created when it is first invoked; the moving of the macro to a function was mostly to keep the code consistent with the other uses of DEFINE_STATIC_LOCAL (if you grep the source tree, you can see that there are no uses of it in the global scope). 438250 22 ryuan.choi 2011-07-16 22:00:05 -0700 (In reply to comment #21) > LGTM, informal r+. > > (In reply to comment #20) > > Although I didn't understand fully, > > I prepared new patch like you mentioned. > > Thanks. > > What part was not clear? Technically speaking, the only difference between the last two patches is that the object only gets created when it is first invoked; the moving of the macro to a function was mostly to keep the code consistent with the other uses of DEFINE_STATIC_LOCAL (if you grep the source tree, you can see that there are no uses of it in the global scope). Ah, I didn't consider when it is created. Thanks for kind explanation. 438325 23 101110 webkit.review.bot 2011-07-17 19:59:01 -0700 Comment on attachment 101110 Patch Clearing flags on attachment: 101110 Committed r91171: <http://trac.webkit.org/changeset/91171> 438326 24 webkit.review.bot 2011-07-17 19:59:07 -0700 All reviewed patches have been landed. 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