bug#50849: 28.0.50; Proposal for Emacs daemon to signal when being busy

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Tue, 06 Sep 2022 17:12:15 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: stefankangas@gmail.com,  Visuwesh <visuweshm@gmail.com>,
    >> larsi@gnus.org,  bugs@gnu.support,  50849@debbugs.gnu.org
    >> Date: Tue, 06 Sep 2022 16:02:01 +0200
    >> 
    >> >>>>> On Tue, 06 Sep 2022 15:22:27 +0300, Eli Zaretskii <eliz@gnu.org> said:
    >> 
    Eli> Looking at the code, I don't understand how this was supposed to
    Eli> work.  After sending the request to the server, we call recv in a
    Eli> loop, waiting for a response.  But in a normal session, the server
    Eli> will only respond when the user is done with editing the file, which
    Eli> could be after a very long time.  So this _must_ time out.
    >> 
    >> Doesnʼt the server send its pid to the client? Youʼd want to
    >> recv+timeout just for that initial response, no?

    Eli> Maybe, I don't know.  If that's always so, then yes, the code should
    Eli> be restructured to time out only on that single response.

server-process-filter unconditionally does:

	(server-send-string proc (concat "-emacs-pid "
					 (number-to-string (emacs-pid)) "\n"))

Robert
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