libhl-3.1

• fixed get_entry_position() in linklist.c (was not retaining a lock)
• gracefully handling OOM conditions
• minor cleanings
• using autoconf to manage the project

libhl-3.0

• list_sort()
• optimisations and cleanings in the hashtable implementation

libhl-2.9

• Fixed a potential race condition introduced in 2.8
• Minor fixes and improvements
• Minor additions to the linklist and hashtable APIs

libhl-2.8

• Optimizations in the hashtable implementation (faster iterators and got rid of the table-level lock)

libhl-2.7

• minor optimisations and extensions to the fbuf interface

libhl-2.6

• extended the hashtable interface
• the free_value_callback is now taken into account when destroying tagged linked lists
• minor bugfixes

libhl-2.5

• Bugfixes and memory optimisations
• minor changes in the refcnt API

libhl-2.4

• Introduced a skip list implementation
• Fixed a major bug in the bin heap implementation (and hence in the priority queue as well)
• Exported some macros to facilitate the use of the atomic builtins in atomic_defs.h (were previously exported by refcnt.h)

libhl-2.3

• cleaned up the queue implementation and stress-tested for leaks and corner cases
• improved tests for the lock-free queue

libhl-2.2

• Reviewed the implementation of queue.c to get rid of a memory leak triggered sporadically by a race condition
• The position-based API exposed by queue.h has been dropped
• Minor bugfixes and cleanings in hashtable.c