From: Eli Zaretskii <eliz@gnu.org>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: gerd.moellmann@gmail.com, emacs-devel@gnu.org
Subject: Re: MPS prstack
Date: Mon, 27 May 2024 14:34:31 +0300 [thread overview]
Message-ID: <86v82zv67s.fsf@gnu.org> (raw)
In-Reply-To: <87le3vogt8.fsf@gmail.com> (message from Helmut Eller on Mon, 27 May 2024 09:27:31 +0200)
> From: Helmut Eller <eller.helmut@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, Emacs Devel <emacs-devel@gnu.org>
> Date: Mon, 27 May 2024 09:27:31 +0200
>
> Somewhat related: I wonder if this line in print_stack_push is safe:
>
> prstack.stack[prstack.sp++] = e;
>
> This is not an atomic operation and prstack.sp gets updated before the
> new stack slot is initialized.
Are you sure? I think the above assigns e to
prstack.stack[prstack.sp], and then increments prstack.sp. What you
describe is this instead:
prstack.stack[++prstack.sp] = e;
By analogy with the original code above, what does the following do?
char *s;
*s++ = 'a';
AFAIU, it stores 'a' in the address pointed by s and then increments
s.
prev parent reply other threads:[~2024-05-27 11:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-20 17:54 MPS prstack Helmut Eller
2024-05-20 18:21 ` Gerd Möllmann
2024-05-20 18:32 ` Helmut Eller
2024-05-21 3:30 ` Gerd Möllmann
2024-05-22 16:27 ` Helmut Eller
2024-05-22 17:55 ` Gerd Möllmann
2024-05-24 14:17 ` Helmut Eller
2024-05-24 14:27 ` Gerd Möllmann
2024-05-25 13:45 ` Gerd Möllmann
2024-05-27 7:27 ` Helmut Eller
2024-05-27 8:43 ` Gerd Möllmann
2024-05-27 9:15 ` Helmut Eller
2024-05-27 9:47 ` Gerd Möllmann
2024-05-27 11:45 ` Eli Zaretskii
2024-05-27 12:39 ` Helmut Eller
2024-05-27 13:12 ` Eli Zaretskii
2024-05-27 14:15 ` Helmut Eller
2024-05-27 14:37 ` Mattias Engdegård
2024-05-27 14:54 ` Helmut Eller
2024-05-27 14:43 ` Po Lu
2024-05-27 15:08 ` Helmut Eller
2024-05-27 11:34 ` Eli Zaretskii [this message]
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