From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Philipp Stephani Newsgroups: gmane.emacs.bugs Subject: bug#33839: 26.1.90; Emacs occasionally fails to receive asynchronous subprocess output in batch mode Date: Tue, 25 Dec 2018 17:38:31 +0100 Message-ID: References: <835zvk9skp.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1545755827 26697 195.159.176.226 (25 Dec 2018 16:37:07 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 25 Dec 2018 16:37:07 +0000 (UTC) Cc: 33839@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Dec 25 17:37:03 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gbphW-0006nf-CE for geb-bug-gnu-emacs@m.gmane.org; Tue, 25 Dec 2018 17:37:02 +0100 Original-Received: from localhost ([127.0.0.1]:41972 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gbpjd-0004CJ-1G for geb-bug-gnu-emacs@m.gmane.org; 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Dez. 2018 um 17:45 Uhr schrieb Philipp Stephani : > > Am So., 23. Dez. 2018 um 16:22 Uhr schrieb Eli Zaretskii : > > > > > From: Philipp > > > Date: Sun, 23 Dec 2018 03:28:53 +0100 > > > > > > (with-temp-buffer > > > (let ((proc (make-process :name "test" > > > :command '("bash" "-c" "echo stdout; echo stderr >&2") > > > :buffer (current-buffer) > > > :connection-type 'pipe > > > :sentinel #'ignore > > > :noquery t > > > :coding '(utf-8-unix . utf-8-unix)))) > > > (when (process-live-p proc) > > > (process-send-eof proc)) > > > (while (process-live-p proc) > > > (accept-process-output proc)) > > > (cl-assert (equal (buffer-string) "stdout\nstderr\n") :show-args))) > > > > > > Then evaluate this form repeatedly. Occasionally the buffer is empty > > > and the assertion triggers. > > > > Isn't there an inherent race condition here? > > Maybe? If so, then it should be documented, with an explanation how to > write this in a race-free manner. (It seems waiting for the process > sentinel to run works reliably.) This is also probably closely related to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31214.