[cairo] Static caches and thread-safety

[Keith Packard]

Around 14 o'clock on Nov 11, Carl Worth wrote:

> But how shall we fix this?

Our experience in xcb was that you can use the pthread locking APIs
directly.  On linux, glibc has 'weak' stubs which are used when -lpthread
isn't used by the application.  Other systems either appear to include 
those APIs in libc directly.

The requirement that I see is that applications needn't tell cairo that 
they are using multiple threads, and that the application never get 
control while any internal lock is held.

-keith


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