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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: why "in_sighandler"?
Date: Mon, 21 Aug 2006 07:13:09 -0400
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    handling_signal may be non-zero even if no signal handler is invoked.  
    For example, from UNBLOCK_INPUT (via reinvoke_input_signal => 
    handle_async_input).  Also if SYNC_INPUT is used.  So handling_signal 
    really means "handling X11/GUI event".  I needed a variable that was 
    only set when the signal handler is running.

Could you please install comments which clearly explain this?