Interruptible VM loop via callback function

[loki04]

It would be nice if the VM loop can be interruptible.
In those cases when the JerryScript is used as a library or embedded in a 3rd party application it is hard to be responsible for the application. If the execution of a JavaScript takes too much time - infinite loop, benchmarking, etc. - the main application is not able pause or brake the current execution context.

Is it possible to have a callback function mechanism implemented which is responsible to break or pause the current VM loop? Maybe this callback function can be called in backward loop instruction (if there is such).

[martijnthe]

@zherczeg brought a similar idea up in the community call yesterday.

I think it makes sense to have this feature.

FWIW, I was planning on running JerryScript in a dedicated RTOS task and adding a software watchdog around it, to make sure that the VM returns control in time. If it doesn't, I'll simply kill the task.

I can imagine scenarios (for example when using cooperative multitasking) where the "interruption" callback is useful.

[zherczeg]

#1753

[loki04]

Closing this, since #1753 has been merged.