[fpc-devel] threadvar vs docs

[Michael Van Canneyt]

On Fri, 18 Oct 2024, Nikolay Nikolov via fpc-devel wrote:

>
> On 10/18/24 12:10 AM, Martin Frb via fpc-devel wrote:
>> https://wiki.freepascal.org/Threadvar
>>> If threads are used then a copy is made for each thread (including 
>>> the main thread). Note that the copy is made with the original value 
>>> of the variable, not with the value of the variable at the time the 
>>> thread is started. 
>>
>> But what is that original value? Since
>> threadvar
>>   foo: integer = 1;
>>
>> gives
>> Error: Cannot initialize variables declared as threadvar
>
> I think the documentation is wrong. Threadvars are always initialized as 
> zero.

Then please explain what do copy_all_unit_threadvars and copy_unit_threadvars do ?

This is called from InitThreadVars when a new thread is started.

Michael.