当使用上述3种方法之一后，整个解释器就会被中断。
t = Thread.new { ... }
t.abort_on_exception = true
线程同步控制
在Ruby中，提供三种实现同步的方式，分别是：
1. 通过Mutex类实现线程同步
2. 监管数据交接的Queue类实现线程同步
3. 使用ConditionVariable实现同步控制
通过Mutex类实现线程同步
通过Mutex类实现线程同步控制，如果在多个线程钟同时需要一个程序变量，可以将这个变量部分使用lock锁定。 代码如下：
#encoding:gbk
require "thread"
puts "Synchronize Thread"
@num=200
@mutex=Mutex.new
def buyTicket(num)
@mutex.lock
if @num>=num
@num=@num-num
puts "you have successfully bought #{num} tickets"
else
puts "sorry,no enough tickets"
end
@mutex.unlock
end
ticket1=Thread.new 10 do
10.times do |value|
ticketNum=15
buyTicket(ticketNum)
sleep 0.01
end
end
ticket2=Thread.new 10 do
10.times do |value|
ticketNum=20
buyTicket(ticketNum)
sleep 0.01
end
end
sleep 1
ticket1.join
ticket2.join
输出结果如下：
Synchronize Thread you have successfully bought 15 tickets you have successfully bought 20 tickets you have successfully bought 15 tickets you have successfully bought 20 tickets you have successfully bought 15 tickets you have successfully bought 20 tickets you have successfully bought 15 tickets you have successfully bought 20 tickets you have successfully bought 15 tickets you have successfully bought 20 tickets you have successfully bought 15 tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets sorry,no enough tickets
除了使用lock锁定变量，还可以使用try_lock锁定变量，还可以使用Mutex.synchronize同步对某一个变量的访问。
监管数据交接的Queue类实现线程同步
Queue类就是表示一个支持线程的队列，能够同步对队列末尾进行访问。不同的线程可以使用统一个对类，但是不用担心这个队列中的数据是否能够同步，另外使用SizedQueue类能够限制队列的长度
SizedQueue类能够非常便捷的帮助我们开发线程同步的应用程序，应为只要加入到这个队列中，就不用关心线程的同步问题。
经典的生产者消费者问题：
#encoding:gbk
require "thread"
puts "SizedQuee Test"
queue = Queue.new
producer = Thread.new do
10.times do |i|
sleep rand(i) # 让线程睡眠一段时间
queue << i
puts "#{i} produced"
end
end
consumer = Thread.new do
10.times do |i|
value = queue.pop
sleep rand(i/2)
puts "consumed #{value}"
end
end
consumer.join
程序的输出：
SizedQuee Test
0 produced
1 produced
consumed 0
2 produced
consumed 1
consumed 2
3 produced
consumed 34 produced
consumed 4
5 produced
consumed 5
6 produced
consumed 6
7 produced
consumed 7
8 produced
9 produced
consumed 8
consumed 9
