mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
a8c748d277
a patch from Kazuhiro NISHIYAMA <zn at mbf.nifty.com>. [ruby-dev:30713] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12184 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
54 lines
767 B
Ruby
54 lines
767 B
Ruby
#
|
|
# 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
|