[Glass] Semaphore error

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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