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bug#33018: 26.1.50; thread starvation with async processes and accept-pr
From: |
Basil L. Contovounesios |
Subject: |
bug#33018: 26.1.50; thread starvation with async processes and accept-process-output |
Date: |
Sun, 14 Oct 2018 16:17:08 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Michael Albinus <michael.albinus@gmx.de> writes:
> "Basil L. Contovounesios" <contovob@tcd.ie> writes:
>
>> I attach a sample program test.el whose central function, test-slave,
>> invokes wget asynchronously before waiting for the process to exit.
>>
>> The issue I'm facing is that running test-slave twice in succession,
>> each time in a new thread, causes accept-process-output to hang with no
>> output (unless a timeout argument is given, in which case the function
>> returns nil) the second time around.
>
> If you want a process to communicate in a given thread, you must call
> `set-process-thread'. See the elisp manual.
Thanks, this is the first thing I tried when earlier experiments started
to hang. I tried both the following redundant but explicit call:
diff -u --label /tmp/test.el --label \#\<buffer\ /tmp/test.el\> /tmp/test.el
/tmp/buffer-content-hY0EDf
--- /tmp/test.el
+++ #<buffer /tmp/test.el>
@@ -24,6 +24,7 @@
:command '("wget" "-qO-" "https://en.wikipedia.org/wiki/Emacs")
:connection-type 'pipe
:sentinel #'test-sentinel)))
+ (set-process-thread proc (current-thread))
(while (eq (process-status proc) 'run)
(test-debug proc 'accept-output (accept-process-output proc 5)))
(test-debug proc 'exit (process-status proc) (process-exit-status proc))))
Diff finished. Sun Oct 14 16:04:48 2018
as well as replacing (current-thread) with nil, to unlock the process.
Adding test-debug calls before and after accept-process-output revealed
nothing out of the ordinary, and explicitly un/locking the process
didn't fix the hang. Should I be calling set-process-thread elsewhere?
--
Basil
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Basil L. Contovounesios, 2018/10/11
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Michael Albinus, 2018/10/12
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Eli Zaretskii, 2018/10/12
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output,
Basil L. Contovounesios <=
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Eli Zaretskii, 2018/10/16
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Basil L. Contovounesios, 2018/10/17
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Eli Zaretskii, 2018/10/17
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Basil L. Contovounesios, 2018/10/17
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Eli Zaretskii, 2018/10/17
- bug#33018: 26.1.50; thread starvation with async processes and accept-process-output, Eli Zaretskii, 2018/10/17