Re: [Sbcl-help] is setq atomic?

[Giovanni G. <gi...@ci...>]

Bhaskara Marthi wrote:
> In other words, is it safe to have multiple threads reading a special 
> variable and/or using setq to change it, without any locking?
Seconded... I add that it would be very useful to have this answer 
included in the threads section of the sbcl manual; and not just for 
plain variables, but also for other things (arrays, hash tables, 
objects, structs...). The manual currently is very vague ("Large amounts 
of the SBCL library have not been inspected for thread-safety"); one can 
surely put locks around everything, just to be safe, but it would be 
nice to know when this is necessary and when it is not.
I remember seeing this kind of information sometimes appearing in the 
CHANGES in the past, but it is difficult to find it.