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-rwxr-xr-xtest/thread/lbtest.rb51
1 files changed, 51 insertions, 0 deletions
diff --git a/test/thread/lbtest.rb b/test/thread/lbtest.rb
new file mode 100755
index 0000000..10bb901
--- /dev/null
+++ b/test/thread/lbtest.rb
@@ -0,0 +1,51 @@
+#! /usr/bin/ruby
+require 'thread'
+
+class LocalBarrier
+ def initialize(n)
+ @wait = Queue.new
+ @done = Queue.new
+ @keeper = begin_keeper(n)
+ end
+
+ def sync
+ @done.push(true)
+ @wait.pop
+ end
+
+ def join
+ @keeper.join
+ end
+
+ private
+ def begin_keeper(n)
+ Thread.start do
+ n.times do
+ @done.pop
+ end
+ n.times do
+ @wait.push(true)
+ end
+ end
+ end
+end
+
+n = 10
+
+lb = LocalBarrier.new(n)
+
+(n - 1).times do |i|
+ Thread.start do
+ sleep((rand(n) + 1) / 10.0)
+ puts "#{i}: done"
+ lb.sync
+ puts "#{i}: cont"
+ end
+end
+
+lb.sync
+puts "#{n-1}: done"
+
+# lb.join # leaving waiting threads.
+
+puts "exit."