`jl_exit_threaded_region` may not execute if interrupted in threadruning

[songjhaha]

julia/base/threadingconstructs.jl

Line 193 in 0a546ea

ccall(:jl_exit_threaded_region, Cvoid, ())

Interrupt could be throw during threading:

julia> function main()
           Threads.@threads for i = 1:100
               x = rand(100) .* rand(100)
               sleep(1)
           end
       end
main (generic function with 1 method)

julia> main()
ERROR: InterruptException:
Stacktrace:
 [1] try_yieldto(undo::typeof(Base.ensure_rescheduled))
   @ Base .\task.jl:945
 [2] wait()
   @ Base .\task.jl:1009
 [3] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)
   @ Base .\condition.jl:130
 [4] wait
   @ .\condition.jl:125 [inlined]
 [5] _wait(t::Task)
   @ Base .\task.jl:317
 [6] threading_run(fun::var"#37#threadsfor_fun#8"{var"#37#threadsfor_fun#7#9"{UnitRange{Int64}}}, static::Bool)
   @ Base.Threads .\threadingconstructs.jl:167
 [7] macro expansion
   @ .\threadingconstructs.jl:220 [inlined]
 [8] main()
   @ Main .\REPL[7]:2
 [9] top-level scope
   @ REPL[8]:1

julia> ccall(:jl_in_threaded_region, Cint, ())
1