DIP60: @nogc attribute

[Manu via Digitalmars-d]

On 18 April 2014 16:16, via Digitalmars-d <digitalmars-d at puremagic.com>wrote:

> On Friday, 18 April 2014 at 00:11:28 UTC, H. S. Teoh via Digitalmars-d
> wrote:
>
>> I thought that whole point of *A*RC is for the compiler to know when ref
>> count updates can be skipped? Or are you saying this is algorithmically
>> undecidable in the compiler?
>>
>
> Multithreading cause major problems. A function owns the array passed as a
> parameter, no ref counting needed, but if another thread is deleting
> objects in the array then you cannot assume that ownership is transitive
> and will have to inc/dec every object you look at. If it is thread local
> then ownership is transitive and no inc/decs are needed in the function...?
>
> But how can you let the compiler know that you have protected the array so
> only one thread will take processing-ownership during the life span of the
> function call?
>

D pointers are thread-local by default, you need to mark things 'shared'
explicitly if they are to be passed between threads. This is one of the
great advantages D has over C/C++/Obj-C.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puremagic.com/pipermail/digitalmars-d/attachments/20140418/dfa0f71b/attachment.html>