[cairo] reference counting vs garbage collection

[Keith Packard]

Around 14 o'clock on Jan 5, Kristian Høgsberg wrote:

> The problem is that the FILE (or whatever resource) could be shared between
> several surfaces.  When you call create_similar, the PDF backend creates a
> new surface which references the same underlying FILE.

How can this work?  Is there synchronization between the set of surfaces 
sharing the same FILE?  Do the similar surfaces reference the 'master' 
surface?  If so, wouldn't they be effectively painting 'through' the 
master surface and hence abide by it's 'closed' status?

-keith


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