Re: [F-Script-talk] Block as NSThread target

[Philippe M. <pm...@ac...>]

Hi Joerg,

As you suggested, it would probably requires providing a specific=20
Objective-C method for block evaluation managing the creation and=20
destruction of the an autorelease pool (it would be easy too add it=20
yourself, for instance in a category). However, you should completely=20
ignore the problem for now, because of a much bigger issue: in the=20
current implementation, the F-Script run-time is not thread safe. That=20=

is, two threads in the same task should not access the F-Script=20
run-time concurrently; something which will happen in your case since=20
you're detaching a thread executing an F-Script block from an F-Script=20=

program.

Can you, by chance, re-formulate your application with a single active=20=

F-Script thread ?

Best,

Phil


Le jeudi, 7 ao=FB 2003, =E0 17:02 Europe/Paris, Joerg Garbers a =E9crit =
:

> Hi,
> what is the right way to make a new thread with an FScript block as=20
> target?
>
> The problem with
> NSThread detachNewThreadSelector:#value: toTarget:myBlock=20
> withObject:someObject.
> is that there is no NSAutoreleasePool in Place for the execution of=20
> myBlock.
>
> So myBlock must be shielded by some initialization:
> NSThread detachNewThreadSelector:#value: toTarget:(makeThreadableBlock=20=

> value:myBlock) withObject:someObject.
>
> Is there a really good implementation in FScript for this?
>
> makeThreadableBlock:=3D[:innerBlock |
>   [:arg ||p|
>     p:=3DNSAutoreleasePool alloc init.
>     innerBlock value:arg.
>     p release.
>     ]].
>
> yields an error, because NSAutoreleasePools may not be retained (by=20
> assignment to p). So no assignment? But how to empty the pool then?
>
> makeThreadableBlock:=3D[:innerBlock |
>   [:arg ||p|
>     NSAutoreleasePool alloc init.
>     innerBlock value:arg.
>     ]].
>
> but even the following does not catch all of the autoreleases (see=20
> console warnings)
>
> makeThreadableBlock:=3D[:innerBlock |
>   [:arg ||p|
>     p:=3DNSValue valueWithNonretainedObject:(NSAutoreleasePool alloc=20=

> init).
>     innerBlock value:arg.
>     p nonretainedObjectValue release.
>     ]].
>
> Any other solutions? Or should the Block method
> -(id) valueArgs:(id*)args count:(unsigned)count
> contain NSAutoreleasePool initialization and termination?
>
> Joerg
>