Re: our :shared $foo / iThreads

[Artur Bergman]

01-05-04 17.01, skrev Dan Sugalski p� [EMAIL PROTECTED] f�ljande:

> At 10:47 AM 5/4/2001 -0400, Benjamin Sugars wrote:
>> On Fri, 4 May 2001, Dan Sugalski wrote:
>> 
>>> Just make sure that it's *really* readonly. That means no
>>> stringification/numification after the flag is set.
>> 
>> Is there another flag differnt from SvREADONLY that ensures this?  Or is
>> it up to the programmer to avoid stringification/numification?
> 
> There's no flag that I can see. Perl will happily upgrade a readonly
> scalar, which is decidedly non-threadsafe.
> 
> The only safe thing to do for this is to make sure the scalar is upgraded
> first. I'd go either to SVt_PVNV or all the way to SVt_PVMG. The magic
> form's generally unnecessary (and a bit big), but if someone tries to
> lock() on the variable then lock will upgrade it anyway.
> 
> Dan
> 

Then this is a bug in bleadperls implmentation of :shared GVs?

Artur