Changes between Version 93 and Version 94 of ReleaseNotes/Mainline

2018-12-15T07:49:25Z (5 years ago)
Jakub Jermář


  • ReleaseNotes/Mainline

    v93 v94  
    2121   * Container based on red-black trees
    2222   * Replaced AVL trees and B+trees
     23   * Unlike the B+tree implementation, which was also used in HelenOS address space management, the ordered dictionary comes with an API which does not allocate memory itself and is thus more favorable from the point of view of resource management.
    2324 * The kernel used to pass kernel addresses of IPC phone objects (a.k.a. phone hashes) as connection identifiers to userspace. This intentional but unfortunate information leak was replaced in this release by purely user-defined labels negotiated during IPC connection setup handshake. Each connected phone now has a user-defined label and imprints this label on each IPC call which is routed through it.
    2425 * In 2014 HelenOS got its own implementation of RCU (Read-Copy-Update) synchronization primitive along with a CHT (Concurrent Hash Table) data type based on RCU. Although sophisticated and interesting from the technological point of view, the RCU and CHT were mostly unused and unmaintained. We therefore decided to remove these very complex features.