[Glass] Semaphore error

[Dale Henrichs via Glass]

Try using a TransientSemaphore in place of Semaphore. It's designed to be
used in chunks of code that may become persistent ...

Dale

On Sat, Nov 29, 2014 at 5:15 AM, Dario Trussardi via Glass <
glass at lists.gemtalksystems.com> wrote:

> Ciao,
> i work with Gemstone 3.1.0.6  environment.
>
> I need to manage a critical access ( not simultaneous use of the device )
> to printer device.
>
> I define a  printer "data base " with  accessSema   instance set to:
>
> ^ accessSema ifNil:[ accessSema := Semaphore forMutualExclusion ]
>
>
> and a method : critical: mutuallyExcludedBlock
>
> ^ self accessSema critical: mutuallyExcludedBlock
>  But when i do the printer command with:
>
> aPrinter critical:[
>
> the system answer:
> a TransactionError occurred (error 2407), The object Semaphore(316884481)
> may not be committed, 'instances of its class are non-persistent'
> How i can manage a global critical access to the printer device ?
>
> Considerations ?
>
> Thanks,
>
> Dario
>
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