[RELEASE] Userspace RCU 0.5.4

[Mathieu Desnoyers]

liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This data
synchronization library provides read-side access which scales linearly with the
number of cores. It does so by allowing multiples copies of a given data
structure to live at the same time, and by monitoring the data structure
accesses to detect grace periods after which memory reclamation is possible.

Changelog for v0.5.4:

 *  urcu-bp: Update fork() handling
    
    Introduce
    
    extern void rcu_bp_before_fork(void);
    extern void rcu_bp_after_fork_parent(void);
    extern void rcu_bp_after_fork_child(void);
    
    to handle fork gracefully. These disable signals and hold the registry mutex
    across forks. (this flavor of the liburcu library ("bp" for "bulletproof")
    is mainly used by UST, the user-space tracer).

Project website: http://lttng.org/urcu
Download link: http://www.lttng.org/files/urcu/

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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