parallelize and @parameter issue in Mojo 24.5

I am trying to convert my projects to Mojo 24.5. Right now I face the following issue.

When running

from algorithm import parallelize

fn main():
    var t = 5
    @parameter
    fn whatever(ip:Int):
        print(t)
    parallelize[whatever](1)

from algorithm import parallelize

fn main():
    var t = 5
    @parameter
    fn whatever(ip:Int):
        print(t)
    parallelize[whatever](1)

I get 4507533440 printed as result.

In the @parameter doc https://docs.modular.com/mojo/manual/decorators/parameter it says

This is an unsafe feature because we currently do not model the lifetimes of capture-by-reference.

but up to 24.4 i never had this issue. Did i miss some fundamental change here? Any advice how to handle this would be great. Thx

ps
adding

  '_ = t'

  '_ = t'

at the end of this demo would solve the issue but that gets complicated and ugly in my projects ...

@parameter | Modular Docs

Executes a function or if statement at compile time.

Modular•2y ago•

5 replies

Martin Dudek

parallelize and @parameter issue in Mojo 24.5

I am trying to convert my projects to Mojo 24.5. Right now I face the following issue.

When running

from algorithm import parallelize

fn main():
    var t = 5
    @parameter
    fn whatever(ip:Int):
        print(t)
    parallelize[whatever](1)

from algorithm import parallelize

fn main():
    var t = 5
    @parameter
    fn whatever(ip:Int):
        print(t)
    parallelize[whatever](1)

ps
adding

  '_ = t'

  '_ = t'

at the end of this demo would solve the issue but that gets complicated and ugly in my projects ...

@parameter | Modular Docs

Executes a function or if statement at compile time.

parallelize and @parameter issue in Mojo 24.5

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