Commits on Jul 5, 2022

1. signal: add track_caller to public APIs …

   Functions that may panic can be annotated with #[track_caller] so that
   in the event of a panic, the function where the user called the
   panicking function is shown instead of the file and line within Tokio
   source.
   
   This change adds #[track_caller] to the signal() function which is the
   only function in the signal public API which can panic. Documentation
   was added to this function to indicate that it may panic.
   
   Not all panic cases can have #[track_caller] applied fully as the
   callstack passes through a closure which isn't yet supported by the
   annotation (e.g. signal() called from outside a tokio runtime).
   
   Tests are included to cover the case where signal() is called from a
   runtime without IO enabled.
   
   Refs: tokio-rs#4413

   

   hds committed Jul 5, 2022
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