Attribute Macro thx 

#[thx]

#[thx] — splice my_perl: *mut ::libperl_sys::PerlInterpreter as the first parameter of fn in threaded builds; pass through unchanged in non-threaded builds.

The injected name my_perl matches the C convention (aTHX_) and the project’s naming rule (see docs/plan/README.md §3.8). The fully-qualified path ::libperl_sys::PerlInterpreter is hard-coded rather than $crate::PerlInterpreter because proc-macros emit raw tokens — the path is resolved at the call site of #[thx].

Examples

Source:

#[thx]
fn helper(sv: *mut SV) -> i32 { /* ... */ }

Threaded expansion:

fn helper(my_perl: *mut ::libperl_sys::PerlInterpreter, sv: *mut SV) -> i32 { /* ... */ }

Non-threaded expansion: identical to the input.