Feature #3620: Add Queue, SIzedQueue and ConditionVariable implementations in C in addition to ruby ones
http://redmine.ruby-lang.org/issues/show/3620

Author: Ricardo Panaggio
Status: Open, Priority: Normal
Category: ext

Queue, SizedQueue and ConditionVariable are important synchronization primitives and are nowadays implemented in Ruby.

Attached patch (initiated by myself and heavily enriched by Nobu) contains these sync primitives implemented in C, which makes them faster (see [1] for the benchmark's code):

Rehearsal -------------------------------------------------
Q#push          1.590000   0.010000   1.600000 (  1.605502)
T#push          0.600000   0.010000   0.610000 (  0.630444)
Q#pop           4.390000   0.000000   4.390000 (  4.389781)
T#pop           0.580000   0.000000   0.580000 (  0.578918)
Q#empty?        0.480000   0.000000   0.480000 (  0.484305)
T#empty?        0.360000   0.000000   0.360000 (  0.358559)
Q#clear         1.210000   0.000000   1.210000 (  1.214494)
T#clear         0.600000   0.000000   0.600000 (  0.588611)
Q#size          0.370000   0.000000   0.370000 (  0.365587)
T#size          0.350000   0.000000   0.350000 (  0.356985)
Q#num_waiting   0.380000   0.000000   0.380000 (  0.379199)
T#num_waiting   0.370000   0.000000   0.370000 (  0.368075)
--------------------------------------- total: 11.300000sec

It has already been discussed on ruby-core (see ruby-core:31100).

This patch is one of the deliverables of my RubySoC project (slot #17): "Improving Ruby's Synchronization Primitives and Core Libraries" [2,3]

[1] http://github.com/panaggio/rubysoc-2010/blob/master/benchmarks/queue.rb
[2] http://pastebin.com/viSnfqe6
[3] http://rubysoc.org/projects


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