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Diffstat (limited to 'jni/ruby/sample/philos.rb')
-rw-r--r-- | jni/ruby/sample/philos.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/jni/ruby/sample/philos.rb b/jni/ruby/sample/philos.rb new file mode 100644 index 0000000..5c8f43c --- /dev/null +++ b/jni/ruby/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 |