Thanks for advices, I found solution. There is whenDone() function that
called on end of Asyncify execution, and in case of unhandled exception you
can cath. Like this:
Asyncify.whenDone().catch((error) => { ... });
return Asyncify.handleSleep(function(wakeUp) { ...; wakeUp(); })
ср, 7 дек. 2022 г. в 22:24, 'Sam Clegg' via emscripten-discuss <
emscripten-discuss@googlegroups.com>:
> IIUC this is what the `-sABORT_ON_WASM_EXCEPTIONS` settings is for. This
> basically wraps all the entry points to your wasm module in a try/catch.
> I'm not sure its the best way to handle this but its sounds like its trying
> to solve the problem you are facing:
>
> ```
> // Abort on unhandled excptions that occur when calling exported
> WebAssembly
> // functions. This makes the program behave more like a native program
> where the
> // OS would terminate the process and no further code can be executed when
> an
> // unhandled exception (e.g. out-of-bounds memory access) happens.
>
> // This will instrument all exported functions to catch thrown exceptions
> and
> // call abort() when they happen. Once the program aborts any exported
> function
> // calls will fail with a "program has already aborted" exception to
> prevent
> // calls into code with a potentially corrupted program state.
>
> // This adds a small fixed amount to code size in optimized builds and a
> slight
> // overhead for the extra instrumented function indirection. Enable this
> if you
> // want Emscripten to handle unhandled exceptions nicely at the cost of a
> few
> // bytes extra.
>
> // Exceptions that occur within the `main` function are already handled
> via an
> // alternative mechanimsm.
>
> // [link]
>
> var ABORT_ON_WASM_EXCEPTIONS = false;
> ```
>
> On Tue, Dec 6, 2022 at 2:14 PM Александр Гурьянов <caiiiy...@gmail.com>
> wrote:
>
>> Hi. I use asyncify for dosbox/dosbox-x project, everything works well.
>> But I have little problem, I need to force exit from dosbox. To do this I
>> set flag exitRequested in c++ code while asyncify is in paused state. When
>> it resumes the dosbox check this flag and breaks normal loop execution.
>>
>> This trick works mostly, but it can happen that something goes wrong
>> (e.g. bad place to break the loop), and some unhandled exception will be
>> thrown from webassembly.
>>
>> Typical is:
>> Uncaught RuntimeError: memory access out of bound
>>
>> This exception is unhadled and my client script can't understand that
>> dosbox is died. So I want to catch this exception somehow.I tried to wrap
>> wakeUp (js) function with try/catch but no luck.
>>
>> The only way I found is to add "error" listener, but it is not possible
>> to understand if it error from my dosbox instance (I can run multiple
>> instances per page).
>>
>> So, my question is it possible to turn this unhandled exception to
>> handled?
>>
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