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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] lepton-sch2pcb ignores ^C
Date: Tue, 21 Mar 2023 22:56:26 +0300
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"karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> writes:

>  It cannot be aborted with a ^C:
>
> $ lepton-sch2pcb styrkort.sch 
> Unknown config key: "."
> Unknown config key: "/home/karl/git/openhw/share/pcb/"
> Unknown config key: "/usr/share/pcb/pcblib-newlib/"
> Could not find module (backend pcbpins).
> Fall back to looking up for legacy backend "pcbpins".
> ^CCould not find module (backend PCB).
> Fall back to looking up for legacy backend "PCB".
>
>  and continues as if I havn't pressed control-C.

The issue is a little bit more hard that it seems to look like and
several high level languages have it.  I've found related thread here:

  https://news.ycombinator.com/item?id=32354581

As it stands out, there are several issues in lepton case.

- There is no handler to handle the SIGINT signal from terminal.

- Unless compiled with some dedicated flags, Guile uses several threads
  to run a program.

- lepton-sch2pcb and its predecessor forks and executes side processes
  to get netlists.

Solving the former one is as easy as adding the following code somewhere
after all function definitions in lepton-sch2pcb:

  (sigaction SIGINT (lambda (sig) (primitive-exit 0)))

Even if we solve it, the two latter will get in the way, so it only
partly solves the problem.  Multithreading and forking external
processes complicate everything.

I don't now a right solution yet though there are several directions in
which we develop Lepton that can mitigate if not completely solve the
issue in future:

- Wholly rewrite lepton-sch2pcb in Scheme.

- Replace functions that run lepton-netlist as an external process with
  direct calls to functions defined in its Scheme modules.  That in turn
  requires transforming the backends lepton-sch2pcb uses into "module
  backends" (Scheme modules).

- Get rid of Scheme-in-C functions living for long in our C libraries.

Regards,
  Vladimir