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From: Helmut Eller <eller.helmut@gmail.com>
To: Po Lu <luangruo@yahoo.com>
Cc: Eli Zaretskii <eliz@gnu.org>,
	 gerd.moellmann@gmail.com, emacs-devel@gnu.org
Subject: Re: MPS prstack
Date: Mon, 27 May 2024 17:08:24 +0200	[thread overview]
Message-ID: <878qzvl2c7.fsf@gmail.com> (raw)
In-Reply-To: <s54o78rfh7t.fsf@yahoo.com> (Po Lu's message of "Mon, 27 May 2024 22:43:34 +0800")

On Mon, May 27 2024, Po Lu wrote:

> Helmut Eller <eller.helmut@gmail.com> writes:
>
>> Yes.  I think 
>>
>>   prstack.stack[prstack.sp] = e;
>>   __atomic_store_n (&prstack.sp, prstack.sp + 1, __ATOMIC_SEQ_CST);
>>
>> is quite sufficient.
>
> How so?  This doesn't guarantee that MPS cannot pause the thread after E
> is saved into prstack but before prstack.sp is incremented,

Right.  But we are sure that prstack.sp is not incremented before E is
saved.  And scan_prstack doesn't care what is beyond prstack.sp.

> or that E
> will remain on the control stack or in the register file until it is.

Yes.  But that's another issue.  That could be solved by making
print_stack_push a non-inline function that takes a reference to E as
argument.



  reply	other threads:[~2024-05-27 15:08 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 [this message]
2024-05-27 11:34           ` Eli Zaretskii

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