Hello, I thought, I was supposed to load it only in a worker... That's because of examples, I guess.
Can I load it in the main browser page without side-effects? (assuming that there's no blocking stuff )? :) Kind regards, Ilya Kantor > On 9 Feb 2023, at 20:37, 'Sam Clegg' via emscripten-discuss > <emscripten-discuss@googlegroups.com> wrote: > > The term "main thread" can be ambiguous and confusing I'm afraid. > > In emscripten we disambiguate we have two concepts of `main` thread. > > 1. The main browser thread (i.e. not a worker) > 2. The main emscripten runtime thread (the thread where the emscripten module > get first loaded). > > Normally on the web these two are the same thing since the emscripten module > gets instantiated on the main browser thread. However if you load the > emscripten module on a worker, then there will be no main browser thread, or > at leat no main browser thread that is accessible to emscripten. > > When we say "proxy to main thread" or "MAIN_THREAD_EM_ASM" we are always > talking about the main runtime thread, since that is the only thing that is > guaranteed to exist. > > There are many APIs which won't work if your main runtime thread is not also > the main browser thread (e.g anything related to the DOM). > > Note: I myself have been confused about these concepts in the past, and my > knowledge could still have gaps but that is my understanding today. > > cheers, > sam > > > > On Thu, Feb 9, 2023 at 12:18 AM Ilya Kantor <ilia...@gmail.com > <mailto:ilia...@gmail.com>> wrote: >> Hello, >> >> I'm reading the docs and getting confused, what the "Main thread" is? >> >> Sometimes it's referred to as the "Main browser thread", the term appears in >> macroses such as MAIN_THREAD_EM_ASM. >> >> I see two possible explanations there, please tell me which one is correct? >> >> 1) The "main thread" is the main browser page thread that loaded WASM >> webworker, the one with the "window" object. It has access to DOM etc. So we >> can use it to work from DOM from C. >> >> It appears so from the page: >> https://emscripten.org/docs/api_reference/emscripten.h.html?highlight=main_thread_async_em_asm#c.MAIN_THREAD_EM_ASM >> >> But it doesn't work for me like that, and I don't see any `postMessage` >> calls in JS, how does Emscripten implement the interaction with the main >> page? >> >> 2) The "main thread" is related to pthread usage: it's the all-parenting >> pthread, when we have multiple pthreads running. Otherwise, if we're not >> using pthreads, then it's irrelevant, the main thread is the only thread >> anyway. >> >> In other words, the "main thread" is a pure pthreads concept, the >> all-parenting thread. >> >> 3) ...Can it be sometimes 1) and sometimes 2)? =) >> >> Please help me to figure out. >> >> Thank you! >> >> Kind regards, >> Ilya Kantor >> >> -- >> 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 >> <mailto:emscripten-discuss+unsubscr...@googlegroups.com>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/029031da-a7f9-47dc-8db0-91a52672e9aan%40googlegroups.com >> >> <https://groups.google.com/d/msgid/emscripten-discuss/029031da-a7f9-47dc-8db0-91a52672e9aan%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-discuss+unsubscr...@googlegroups.com > <mailto:emscripten-discuss+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/CAL_va28pE4CHpBr3h-6oGekgHtcnufajCPV08vCZSmr3kcA0KQ%40mail.gmail.com > > <https://groups.google.com/d/msgid/emscripten-discuss/CAL_va28pE4CHpBr3h-6oGekgHtcnufajCPV08vCZSmr3kcA0KQ%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/8A552383-110C-4002-9BD8-169CF212FDC9%40gmail.com.
