"This should probably never happen???"

[kaeluka]

In file tit_lazy.c, there's a debug print statement that prints "RUNNING!\n": https://github.com/parapluu/mylittlepony/blob/0c89f84f0aba1fadc7b6ae43ff136acd956cc3ce/src/runtime/future/tit_lazy.c#L159-L161
Above, a comment says that "This should probably never happen???". I just saw it happen, programs/ex_active.enc triggers it sometimes:

../programs $ ./ex_active.enc
./ex_active.pony.c:203:13: warning: unused variable '_tmp19' [-Wunused-variable]
  future_t* _tmp19 = _tmp17;;
            ^
1 warning generated.
waiting for result...
obj2
obj2
obj2
obj2
obj2
obj1
obj1
obj1
obj1
obj1
RUNNING!
got result
obj1

[EliasC]

@TobiasWrigstad Just a reminder for you to look into this. I see it happen from time to time as well.

[TobiasWrigstad]

Thanks. It is on my list but not urgent since it seems not to cause crashes. If you are annoyed by the printout, please remove it since this ticket will remember the need to look at it.

[EliasC]

Let's remember to check if this thing stops happening when the new futures arrive!

[TobiasWrigstad]

I am sure it will be since the lightweight threads implementation is redone as part of it.