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author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
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committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
commit | 0dc342de848a642ecce8db697b8fecd83a63e117 (patch) | |
tree | 2b7ed4724aff1f86073e4740134bda9c4aac1a39 /trunk/sample/philos.rb | |
parent | ef70cf7138ab8034b5b806f466e4b484b24f0f88 (diff) |
added tag v1_9_0_4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'trunk/sample/philos.rb')
-rw-r--r-- | trunk/sample/philos.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/trunk/sample/philos.rb b/trunk/sample/philos.rb new file mode 100644 index 0000000000..5c8f43c819 --- /dev/null +++ b/trunk/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 |