Hello, I search a bit here and on the web and found out that obviously there is no “official” way to terminate a started task in julia yet. However, throw an Interruption error seems to work as a workaround for now. But now I would like to do it from within a function. Here is the example. The st…

Remove the quoting after @eval, (the :( ... ) part). Right now you just evaluate a value which is an expression: julia> b = @eval :(Base.throwto(t, InterruptException())) :(Base.throwto(t, InterruptException()))

Ups, sometimes it is the easiest stuff which one oversees. After several hours of trying different solutions for my task I finally made a trivial mistake :wink: Thanks…

EDIT: the answer was to use @async for the throwto. One more thing here, when I try to call the function through a toggle in a Blink window, the turning on works but turning off does not. It freezes and the REPL becomes irresponsible. Here is the code using Blink using Interact const run_toggle …

Yes, that might work sometimes, but you’re messing with the internal state of the scheduler, so it’s not really safe. But you’re just controlling the wrong object: sleep is just a thin wrapper around Timer and the Timer object does support start and stop (actually it maybe just exports the new and c…

Is using schedule(t, InterruptException(), error=true) instead of @async Base.throwto(t, InterruptException()) correct here?

In this case using start and stop would be great, thanks… However, I would also like to have a possibility to stop a general task without throwing an InterruptExeption which looks a bit awkward to me here.

No, there’s no generally safe way to interrupt a task. But you can interrupt any waitable object (by closing it).

Unlike Base.throwto, schedule is a public API. If it is not safe to use, could you document this? From its docstring, I think it’s impossible for users (like me) to know that it’s an unsafe API: https://docs.julialang.org/en/latest/base/parallel/#Base.schedule

Thanks. Does it mean that, as a user, it is valid to call schedule(t, exception, error=true) only if the task is not scheduled yet, like this? julia> t = @task nothing Task (runnable) @0x00007f3b6dd9cc40 julia> schedule(t, InterruptException(), error=true) Task (failed) @0x00007f3b6dd9cc40 Interr…

Right, if you just made the task, that’s an example of when you own it. You also usually own current_task() (which is good, because wait and yield etc. will implicitly take ownership of it), so you can also de-schedule yourself (e.g. call wait()), or throw exceptions (schedule(error=true); wait(), o…

Stop/terminate a (sub)task started with @async

General Usage

jameson December 16, 2019, 4:16pm 10

That’s true, it lacks a mention that only the owning queue responsible for managing that task should call that method (and calling that method transfers ownership to a new queue)

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Stop/terminate a (sub)task started with @async

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