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Robert Schmidt authored
Modify xu_add_f1_ue_data() to be xu_addmod_f1_ue_data(), i.e., "addmod" behavior in which it is possible to also update f1_ue_data. I do it this way since an xu_updade_f1_ue_data() function would be almost the same as the add function (only deleting existing data, whereas the original add() was asserting in that case). Modify tests to test for this behavior. This fixes a concurrency bug. For instance, during reestablishment, the CU needs to update the DU UE ID under which the UE is identified in the DU. Previously, the CU would remove, then add the DU UE ID info. At the same time, the PDCP thread might look up the information. This can lead to asserts. Use the above addmod functionality to do the remove-add under a mutex.
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