[cairo] Atomic reference counting

[Carl Worth]

On Thu, 05 Apr 2007 14:11:23 -0400, Behdad Esfahbod wrote:
> 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?

We've never wanted to add object-level locking inside of cairo. That
just leads to less efficiency than application-level locking, (see bad
experience from Xlib thread-locking implementation).

-Carl
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