Closed
Description
Working with exceptions in the presence of tasks can be a little frustrating. Two concrete issues I encountered:
julia> t = @schedule try
while true; sleep(1); end
catch e
isa(e,InterruptException) || rethrow(e)
end
Task (waiting) @0x00000001116c6cb0
julia> try
error("You will never see me")
catch e
rethrow(e)
finally
Base.throwto(t,InterruptException)
end
ERROR: InterruptException
in throwto at ./task.jl:29
in anonymous at ./no file:6
This is because exception in transit is not task local.
The other problem is that stack traces are pretty bad when waiting on a task:
julia> foo() = error("Foo")
foo (generic function with 1 method)
julia> foo()
ERROR: Foo
in foo at ./none:1
julia> wait(@schedule foo())
ERROR: Foo
in yieldto at ./task.jl:24
in wait at ./task.jl:313
in wait at ./task.jl:228
in wait at ./task.jl:61
The backtrace from the task is not shown anywhere. Ideally it would be displayed somehow.
Activity