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-rw-r--r--trunk/sample/philos.rb54
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diff --git a/trunk/sample/philos.rb b/trunk/sample/philos.rb
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-#
-# 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