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Re: Concurrency via isolated process/thread

From: Ihor Radchenko
Subject: Re: Concurrency via isolated process/thread
Date: Thu, 06 Jul 2023 14:47:13 +0000

Eli Zaretskii <eliz@gnu.org> writes:

>> My understanding is
>>   CHECK_STRING (XCAR (foo));
>>   <we do not want XCAR (foo) to be altered here>
>>   foo = XSTRING (XCAR (foo));
>> So, locking is needed to ensure that CHECK_STRING assertion remains valid.
>> Or did you refer to something else?
> I don't know what Po Lu had in mind, but one aspect of this is that a
> string object might keep its memory address, but its data could be
> relocated.  This can happen as part of GC, and is the reason why
> string data is kept separate from the string itself.

This does not change my understanding.
Locking should prevent manipulations with object data over the time span
the code expects the object to be unchanged.

Ihor Radchenko // yantar92,
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