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#rockbox log for 2015-09-14

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10:12:16kugelwodz: sorry for not answering
10:13:59kugelRooAoA threading is commplex: When you start the App, then an activity (on the process main (ui) thread is launched). The activity starts the service which runs on a separate thread, so it can't make UI calls but is required for backgroudn operation. both are java threads
10:19:21kugelthe service then calls the native Java_org_rockbox_RockboxService_main() which then calls main(), this is all within the RockboxService's thread, so yes a java-spawned thread
10:19:40 Join krabador [0] (~krabador@unaffiliated/krabador)
10:21:10kugelduring execution we create more threads with our own create_thread() function. this uses sigaltstack to create user threads. these run within the java-service-thread, however they have a separate execution context (naturally)
10:21:48kugel"attached to the JVM" is not really applicable for our user threads, since you can only OS threads (pthreads)
10:25:52kugelthe user threads are attached in that their hosting pthread is attached, however they are not attached because AttachCurrentThread() has not been invoked for them
10:32:44 Join pamaury [0] (~quassel@rockbox/developer/pamaury)
10:39:49wodzkugel: So in this context android 5.0 documentation is cristal clear - jni calls can't be made from detached threads where native thread before AttachCurrentThread() is detached.
10:40:22kugelthey are both attached and not attached :)
10:41:10kugelthe problem is that they seemed to have introduced a stack pointer check that hits when one of our user threads calls into java
10:41:25wodzyes
10:41:47kugelthe AttachCurrentThread() constraint is effective since the beginning of android
10:41:57 Join utrack [0] (~utrack@85.234.38.85)
10:42:12kugelit worked because the host thread is attached and there was no stack overflow check
10:43:29wodzcan't we call AttachCurrentThread() for user threads on creation?
10:43:59kugelno
10:44:19kugelwell, I haven't tried but I don't expect it would work
10:44:39kugelas per docs, AttachCurrentThread() creates a java Thread object and associates some TLS
10:45:04kugelpretty sure it uses pthread APIs to access that TLS which would break with user threads
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10:46:47kugelwe should be able to workaroud with a separate worker threads that all can use to make java calls
10:47:02kugelone worker thread
10:48:07wodzyou mean to abstract jni calls and pass message only that such call is needed, right?
10:48:31kugelyea
10:48:44wodzcould work, pretty hacky though
10:48:56kugelevery solution will be hacky
10:48:57wodzand quite a bit of work
10:49:06kugelunless you make rockbox work with preemptive threads :-)
10:49:52kugelwe don't have lots of java calls, it shouldn't be too much work. and actually you can avoid that if you know the current user thread is the rockbox main thread
10:50:22kugelsince that runs on the stack assigned by java during RockboxService creation
10:50:53wodzDo we have facility for task to check if it is run from particular thread?
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10:55:45wodzkugel: ?
10:57:40kugelwodz: "thread_self() == 0" should do it
10:58:49kugelor rather "thread_self() == THREAD_SLOT_ID(0)"
10:59:08kugelslot 0 is always the main thread because that's initialized first
10:59:38kugelfor other threads their id is returned by create_thread(), you'd have to store that in some global
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11:01:03wodzok, but we don't have to know exact thread id, it is enough to know we are not main
11:02:05kugelyea
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