RE: A question on sigchld_handler

[Herbert Euler]

>> Could SIGCHLD possibly be delivered more than once to Emacs, so that
>> `sigchld_handler' is invoked more than once?
>
> A signal is blocked as long as its handler hasn't returned. Thus that
> can only happen when the signal is explicitly unblocked, or the function
> is called manually.

Thank you very much!  :D

So I misunderstood the GNU Libc manual.

There are Lisp_Objects used in `sigio_handler', and other structs used
in other signal handlers.  These data structures seem not atomic to
signals.  How are non-atomic problems avoided here?

Regards,
Guanpeng Xu
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