EMSCRIPTEN and clock_nanosleep

[Mehdi Sabwat]

Hello,

I would like to understand how EMSCRIPTEN integrates musl/it's own implementation of libc.

I am trying to make a minimal example work, will you please help me figure out, what I am missing?

https://code.videolan.org/snippets/982

it seems it is implemented: https://github.com/emscripten-core/emscripten/blob/incoming/system/lib/libc/musl/src/time/clock_nanosleep.c

can you please help me figure out how to integrate it?

Thank you !

At your disposal for more info. if needed

Regards,

[J Decker]

There is https://github.com/kripken/emscripten/issues/5518   Implement clock_nanosleep function

https://github.com/kripken/musl-emscripten/blob/emscripten/src/time/clock_nanosleep.c  looks like there's a supported syscall

emsdk\emscripten\1.38.32\system\lib\clock_nanosleep.c ... but there's a 'libc.symbols' (in just 1.38.32) which only has nanosleep and no clock_nanosleep


there is 1.38.32/src which has library_syscall.js   

```

__syscall265: function(which, varargs) { // clock_nanosleep 

#if SYSCALL_DEBUG

     err('warning: ignoring SYS_clock_nanosleep');

 #endif

     return 0;  

},

```

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[Mehdi Sabwat]

Also:

https://github.com/emscripten-core/emscripten/pull/8662

does this mean the syscall won't be supported? 

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[Mehdi Sabwat]

Hi,

Can anyone help me out ?

Thanks !

Regards

[Jukka Jylänki]

If you want to perform a sleep, in singlethreaded builds an on the
main thread, the only proper way is to yield control flow back to the
browser. In multithreaded builds inside a pthread (web worker) you can
use emscripten_thread_sleep() function to do a synchronous sleep,
check out https://github.com/emscripten-core/emscripten/blob/7224b7930ec2a6abca332300e247619e1aea1719/system/include/emscripten/threading.h#L318
.

If the application is not particularly dependent on native
performance, then either emterpreter or asyncify build modes can be
used to more or less emulate CPU execution/mitigate the call flow
issue, though these come with drawbacks.

Currently sleeping is not implemented as a syscall, but in pthreads
enabled builds those could be implemented backed on top of
emscripten_thread_sleep() (though only for pthreads and not the main
thread)

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[Mehdi Sabwat]

Understood, thank you very much!!

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