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Re: make-thread with lambda form instead of function symbol

From: Noam Postavsky
Subject: Re: make-thread with lambda form instead of function symbol
Date: Sun, 16 Apr 2017 21:46:35 -0400

On Sun, Apr 16, 2017 at 9:12 PM, Eric Abrahamsen
<address@hidden> wrote:
> (defun nnir-run-query (specs)
>   (let* ((results [])
>          (threads
>           (mapcar
>            (lambda (x)
>              (let* ((server (car x))
>                     (search-engine (nnir-server-to-search-engine server)))
>                (make-thread
>                 (lambda ()
>                   (setq results
>                         (vconcat
>                          (nnir-run-search
>                           search-engine
>                           server
>                           (cdr (assq 'nnir-query-spec specs))
>                           (cadr x))
>                          results))))))
>            (cdr (assq 'nnir-group-spec specs)))))
>     (mapc #'thread-join threads)
>     results))
> I'm testing with a single IMAP server query (ie, only one thread is
> being created). The nnir-run-search function for the IMAP backend ends
> up calling nnimap-send-command--> nnimap-wait-for-response-->
> nnheader-accept-process-output--> accept-process-output, so I'm
> expecting that's where the thread yields.
> I'm attaching the traceback here. Dunno if it's something I've done
> wrong...

> #4  0x000000000069f953 in Faccept_process_output (process=..., seconds=..., 
> millisec=..., just_this_one=...) at process.c:4566

Is line process.c:4566 this one?

    error ("Attempt to accept output from process %s locked to thread %s",
           SDATA (proc->name), SDATA (XTHREAD (proc->thread)->name));

I guess that indicates you might be doing something wrong (though
obviously Emacs shouldn't be crashing)

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