Sorry to hijack this thread, I've a similar problem:
void TimerCallback(void* data)
{}
emscripten_set_interval(&TimerCallBack, 20, nullptr);
while (1)
{}
fails to call the callback in non-UI thread created with
pthread_create() ( -s USE_PTHREADS=1
-s PROXY_TO_PTHREAD=1 )
Same code works correctly in the UI thread. I cannot block the UI thread
obviously so doing the latter isn't useful and the former isn't working.
Any pointers would be highly appreciated.
Thanks,
Sarang.
On Wed, Feb 10, 2021 at 10:05 AM 'Sam Clegg' via emscripten-discuss <
[email protected]> wrote:
>
>
> On Wed, Feb 10, 2021 at 3:53 AM Kalle Huttunen <[email protected]> wrote:
>
>> What about worker threads? If `emscripten_set_timeout` is called in a
>> thread other than main, the thread might be blocking somewhere when the
>> timer triggers, no? It might also be that I'm misunderstanding some
>> fundamental concept here... :)
>>
>>
> In that case the JS timer will never fire. All events (including timers)
> require you to return to the event loop before they fire. Actually
> blocking also blocks all events.
>
> --
>> Kalle
>>
>> On Wed, 10 Feb 2021 at 04:50, 'Sam Clegg' via emscripten-discuss <
>> [email protected]> wrote:
>>
>>>
>>>
>>> On Tue, Feb 9, 2021 at 6:50 AM Kalle Huttunen <[email protected]> wrote:
>>>
>>>> Came back to this after a while, and it seems that
>>>> using `emscripten_set_interval` and `emscripten_set_timeout` would not be a
>>>> good option for a general solution after all, as they will try to invoke
>>>> the callback in the calling thread, and there's no guarantees what the
>>>> calling thread will be doing when the timer triggers. So it seems to me
>>>> that some kind of timer specific thread would be needed.
>>>>
>>>>
>>> JavaScript is single threaded, and handlers have to run to completion
>>> before another even can fire. So when timers fire there is, by defintion,
>>> nothing else going on the calling thread. The exception to this is
>>> ASYNCIFY which can make it appear that events occur mid-function. If you
>>> are not using ASYNCIFY you don't need to worry about that.
>>>
>>>
>>>> --
>>>> Kalle
>>>>
>>>> On Tue, 1 Sept 2020 at 10:21, Kalle Huttunen <[email protected]> wrote:
>>>>
>>>>> Ok, thanks for the answer. I started experimenting implementing the
>>>>> timers in my code with `emscripten_set_interval` and
>>>>> `emscripten_set_timeout` in the web build. Do you think this could be the
>>>>> approach also for implementing them in library_syscalls.js?
>>>>>
>>>>> --
>>>>> Kalle
>>>>>
>>>>> On Thursday, 27 August 2020 at 22:26:32 UTC+3 [email protected] wrote:
>>>>>
>>>>>> It looks like we do not support that today. `timer_create.c` is
>>>>>> excluded from the musl build in system_libs.py.
>>>>>>
>>>>>> If you'd like to add it that would be most welcome. It looks like
>>>>>> you'd need to enable that `.c` file and then implement the time_create
>>>>>> syscall in library_syscalls.js.
>>>>>>
>>>>>> cheers,
>>>>>> sam
>>>>>>
>>>>>> On Thu, Aug 27, 2020 at 10:45 AM Kalle Huttunen <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> Does Emscripten support POSIX timers? My code using them compiles,
>>>>>>> but fails to link with undefined references to timer_create() and
>>>>>>> friends.
>>>>>>> I'm wondering am I missing some linker flag etc or are they just not
>>>>>>> supported.
>>>>>>>
>>>>>>> --
>>>>>>> Kalle
>>>>>>>
>>>>>>> --
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