|
From: | Elias Mårtenson |
Subject: | bug#25247: 26.0.50; Concurrency crashes with XLib |
Date: | Fri, 30 Dec 2016 19:21:08 +0800 |
> I open IELM in one window, and an empty buffer "z" in another, and type the
> following:
>
> (loop
> repeat 10
> do (make-thread (lambda ()
> (let ((n (random 10)))
> (with-current-buffer "z"
> (sleep-for n)
> (insert (format "Foo:%d\n" n)))))))
>
> Here, I'd expect to see the "z" buffer being updated at the corresponding
> times. I.e. the message "Foo:4" should be displayed after 4 seconds. This
> is not what I see. Instead the messages appear in batches (i.e. several
> rows appearing at the same time).
And what do the messages that appear together say in the %d part? Do
they all show the same value?
> The following seems to be a problem with lexically bound lambda functions
> used in a thread. The following example illustrates the problem:
>
> (let ((x "test"))
> (make-thread (lambda ()
> (with-current-buffer "z"
> (insert x)))))
>
> I would expect this to insert "test" into the buffer, but instead nothing
> happens. Removing the reference to the variable "x" in the lambda makes it
> work.
Isn't the above expected? If not, why not?
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