Re: Concurrency via isolated process/thread

[Po Lu]

Ihor Radchenko <yantar92@posteo.net> writes:

> Po Lu <luangruo@yahoo.com> writes:
>
>>>    LOCK_OBJECT (foo);
>>>    LOCK_OBJECT (XCAR (foo));
>> ...
>> This is unnecessary.  Loads and stores of Lisp_Object values are cache
>> coherent except on 32 bit systems --with-wide-int.  XCAR (foo) will
>> always load one of the values previously written.
>
> Do you mean that locking XCAR (foo) is unnecessary when foo is locked?

No, that there is no need to lock a cons (or a vector, or anything else
with a fixed number of Lisp_Object slots) before reading or writing to
it.