From d464704f111d211c1f1ff9ef23ef1d755054be00 Mon Sep 17 00:00:00 2001
From: shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 15 Aug 2007 19:08:43 +0000
Subject: add tag v1_8_5_54

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_8_5_54@12952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ruby_1_8_5/sample/philos.rb | 54 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 ruby_1_8_5/sample/philos.rb

(limited to 'ruby_1_8_5/sample/philos.rb')

diff --git a/ruby_1_8_5/sample/philos.rb b/ruby_1_8_5/sample/philos.rb
new file mode 100644
index 0000000000..119e7c36b9
--- /dev/null
+++ b/ruby_1_8_5/sample/philos.rb
@@ -0,0 +1,54 @@
+#
+# The Dining Philosophers - thread example
+#
+require "thread"
+
+srand
+#srand
+N=9				# number of philosophers
+$forks = []
+for i in 0..N-1
+  $forks[i] = Mutex.new
+end
+$state = "-o"*N
+
+def wait
+  sleep rand(20)/10.0
+end
+
+def think(n)
+  wait
+end
+
+def eat(n)
+  wait
+end
+
+def philosopher(n)
+  while TRUE
+    think n
+    $forks[n].lock
+    if not $forks[(n+1)%N].try_lock
+      $forks[n].unlock		# avoid deadlock
+      next
+    end
+    $state[n*2] = ?|;
+    $state[(n+1)%N*2] = ?|;
+    $state[n*2+1] = ?*;
+    print $state, "\n"
+    eat(n)
+    $state[n*2] = ?-;
+    $state[(n+1)%N*2] = ?-;
+    $state[n*2+1] = ?o;
+    print $state, "\n"
+    $forks[n].unlock
+    $forks[(n+1)%N].unlock
+  end
+end
+
+for n in 0..N-1
+  Thread.start(n){|i| philosopher(i)}
+  sleep 0.1
+end
+
+sleep
-- 
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