[cairo] Atomic reference counting

[Behdad Esfahbod]

On Thu, 2007-04-05 at 04:00 -0400, Chris Wilson wrote:
> 3) introduce struct _cairo_object { ref_count, status, user_data};

Does a mutex make sense here too?  Do we want to make cairo_surface_t
usable from multiple threads?  Or we don't care?


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