Hello, in the OP I have a full demo you could check. I also left more info here: https://github.com/emscripten-core/emscripten/issues/11914
I think I got into this situation by force, since spawning threads from a webworker was not originally working: if you create the Module on your webworker, the thread-workers will start executing your webworker's code which can corrupt its onmessage event (replaced by yours!). If spawning threads from a webworker is not allowed from the beginning, what alternatives do we have to execute arbitrary threaded-functions that can lock the UI? On Wednesday, August 19, 2020 at 12:50:42 AM UTC+1 lailto...@gmail.com wrote: > Segmentation, > The update have solved the issue to you? is possible an example code how > are you doing that? > Thanks > > Em terça-feira, 18 de agosto de 2020 às 11:46:17 UTC-3, > segmentation...@gmail.com escreveu: > >> Oh! Yes, it seems so. Thanks for the link! >> >> On Tuesday, August 18, 2020 at 3:09:25 PM UTC+1 mehdi...@gmail.com wrote: >> >>> Hi, >>> I think there is an issue for this : >>> https://github.com/emscripten-core/emscripten/issues/11914 >>> >>> >>> On Mon, Aug 17, 2020 at 3:42 PM 'Sam Clegg' via emscripten-discuss < >>> emscripte...@googlegroups.com> wrote: >>> >>>> >>>> >>>> On Mon, Aug 17, 2020 at 3:28 AM Segmentation Fault Error < >>>> segmentation...@gmail.com> wrote: >>>> >>>>> Should this issue be raised in the emsdk repo? or left aside, until we >>>>> have a final release of the threads feature? >>>>> >>>>> >>>> Thread support in emscripten is officially released and available. If >>>> you find bugs then opening a bug in the emscripten repo (not the emsdk >>>> repo) is probably the right way to go. >>>> >>>> cheers, >>>> sam >>>> >>>> >>>>> On Wednesday, July 29, 2020 at 12:26:14 PM UTC+1 Segmentation Fault >>>>> Error wrote: >>>>> >>>>>> Toying with this concept I realized that some operations cannot be >>>>>> performed if you launch a thread from a Web Worker. >>>>>> >>>>>> A simpler example, following my setup linked in the OP: >>>>>> >>>>>> #include <pthread.h> >>>>>> #include <stdio.h> >>>>>> #include <emscripten.h> >>>>>> >>>>>> void *thread(void *arg) >>>>>> { >>>>>> printf("Hello from thread!\n"); // Execution hangs here if Module >>>>>> is instantiated in a Web Worker >>>>>> return NULL; >>>>>> } >>>>>> >>>>>> EMSCRIPTEN_KEEPALIVE void doSomething() >>>>>> { >>>>>> pthread_t thr; >>>>>> pthread_create(&thr, NULL, thread, NULL); >>>>>> } >>>>>> >>>>>> To me it seems like it gets locked on spawning threads, IO, ... I >>>>>> guess this is not expected behavior, and that this can happen because >>>>>> WASM >>>>>> threads is a WIP feature. Is there anything else I could do here? >>>>>> >>>>>> Cheers, >>>>>> SFE >>>>>> >>>>>> On Friday, July 24, 2020 at 5:35:43 PM UTC+1 alon...@gmail.com wrote: >>>>>> >>>>>>> Interesting, so this can use pthreads from the main thread ok, but >>>>>>> not when starting from a pthread? >>>>>>> >>>>>>> That is a less-tested use case, so it's possible you've run into a >>>>>>> bug. Building with -s PTHREADS_DEBUG may help with extra logging. But >>>>>>> it >>>>>>> may be best to try to reduce this to a small testcase, as it may need >>>>>>> to be >>>>>>> debugged in depth. >>>>>>> >>>>>>> On Thu, Jul 23, 2020 at 7:46 AM Segmentation Fault Error < >>>>>>> segmentation...@gmail.com> wrote: >>>>>>> >>>>>>>> Hello everyone, >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> I have been using for a while emscripten to compile a large >>>>>>>> library. Since its operations take long time, I moved the module to a >>>>>>>> web >>>>>>>> worker, where I can call functions without blocking the UI. And it has >>>>>>>> worked fantastic so far! >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> To further improve performance, I then enabled pthreads in the >>>>>>>> toolchain. I noticed then that the execution got stuck. Somehow this >>>>>>>> issue >>>>>>>> does not occur if the module is executed on the main UI thread, >>>>>>>> instead of >>>>>>>> the web worker. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> I have left a link below, to the demo code on how to reproduce the >>>>>>>> issue: a function that launches a thread, that launches several >>>>>>>> threads. It >>>>>>>> happens that this second level never gets executed if the function was >>>>>>>> called from a web worker. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Maybe I am missing something here, any idea? >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Regards, >>>>>>>> >>>>>>>> SFE >>>>>>>> >>>>>>>> Link: >>>>>>>> https://drive.google.com/file/d/1EtkdRBN1Y8QpsRE19BH5AePAD3VLAV6U/view?usp=sharing >>>>>>>> >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "emscripten-discuss" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to emscripten-disc...@googlegroups.com. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/emscripten-discuss/141a16e4-647e-484c-b36a-8db45addaec8o%40googlegroups.com >>>>>>>> >>>>>>>> <https://groups.google.com/d/msgid/emscripten-discuss/141a16e4-647e-484c-b36a-8db45addaec8o%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> >>>>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "emscripten-discuss" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to emscripten-disc...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/emscripten-discuss/df1255b4-7a74-4b00-9ea7-300ec039c5b6n%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/emscripten-discuss/df1255b4-7a74-4b00-9ea7-300ec039c5b6n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "emscripten-discuss" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to emscripten-disc...@googlegroups.com. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2-jXJingg7HZehLFFtBG24dT0uijNUo0J%2BZhbq-YKPf6w%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2-jXJingg7HZehLFFtBG24dT0uijNUo0J%2BZhbq-YKPf6w%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to emscripten-discuss+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/458f7d1a-0038-443f-bf56-46defcb960ben%40googlegroups.com.
