@__FILE__ not available on workers

[artas360]

Hi all,
it seems that the @__FILE__ macro doesn't not return the expected result when evaluated by workers.
To illustrate this issue you can create a test.jl script containing the following code:

@everywhere f = @__FILE__;
println(pmap(x->f, workers()));

Which, when running julia test.jl prints Any["/tmp/test.jl"] as expected. However with julia -p2 the result is Any["",""], which leads to some issues when trying to reliably access files across workers.

The tests were ran with:

Julia Version 0.4.6
Commit 2e358ce (2016-06-19 17:16 UTC)

and

Julia Version 0.5.0-dev+5504
Commit c7ca319 (2016-07-19 12:45 UTC)

[amitmurthy]

A workaround for this is

foo = @__FILE__
@eval @everywhere f = $foo

The expression f=@__FILE__ on workers cannot really return a pathname as @__FILE__ on the worker does not not point to test.jl, in fact it is not even loaded on the workers.

I am inclined to close this issue as a wont-fix

[tkelman]

could at least use a note in @__FILE__'s documentation

[vtjnash]

could also mention Base.source_path() too

[artas360]

@amitmurthy Thanks a lot for the work around! :) I'll be using it.

[vtjnash]

fixed by #21746

[tkelman]

likely to regress if it doesn't get tested