How do I check in my own native code if termination is happening, and how
do I throw the uncatchable error?
IsTerminating seems to return false on the exit of my native call, and yes,
I can throw an error, but not one that cannot be caught
On Tuesday, 29 July 2025 at 13:22:39 UTC+1 Jakob Kummerow wrote:
> This an optimization: if a loop contains a call, it doesn't need to emit
> its own stack checks in order to support interrupt requests, because the
> callee will contain a stack check.
> So you can add an interrupt check to your native code that you're calling.
> It *might* be feasible to fix this on the V8 side by checking if the
> call's target is known to be a non-JS function... not sure.
>
> (FWIW, the specific given example is a bit unconvincing: a "tight
> rendering loop" that "native_sleep(1000)"s all the time can certainly take
> the minuscule overhead of a function call.)
>
>
> On Tue, Jul 29, 2025 at 9:47 AM jmr <audrius.b...@gmail.com> wrote:
>
>> Hi,
>>
>> I've got code as follows in js:
>>
>> while (true) { native_sleep(1000); }
>>
>> Effectively js keeps leaving and re-entering native code repeatedly
>> without affecting it's own stack. I noticed that in a situation like this
>> TerminateExecution simply does not work.
>>
>> If I change my code to:
>>
>> func js_sleep(arg) { native_sleep(arg); }
>> while (true) { js_sleep(1000); }
>>
>> Then it works, but this adds an unnecessary js stackframe, which for a
>> tight rendering loop might not be great.
>>
>> Is there a way to propagate termination without an extra js frame somehow?
>> I.e., could the termination checks be done when entering/leaving native
>> calls?
>> Can I somehow force the propagation to kick in once I'm leaving my native
>> call?
>>
>> Thanks.
>>
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