Comment by monocasa

That's like saying you can't write to the same file willy nilly after any context creation. In context, I obviously meant that you can perform the same actions in the child or the parent, not that you somehow get free synchronization for accessing all kernel objects.

Also, you can specify CKF_INTERFACE_FORK_SAFE if you want a handle in PKCS#11 that handles synchronization enough internally to call from both the child and the parent simultaneously.