Ruby 监视器分段错误
我按照 http://www.ruby-doc 中的示例进行操作.org/stdlib/libdoc/monitor/rdoc/index.html 并稍微修改了代码：
require 'monitor.rb'
buf = []
buf.extend(MonitorMixin)
empty_cond = buf.new_cond
producer = Thread.start do
# producer
line = "produce at #{Time.now}"
#while line
buf.synchronize do
puts "==> #{line}"
buf.push(line)
empty_cond.signal
end
sleep(2)
#line = "produce at #{Time.now}"
#end
end
loop do
buf.synchronize do
empty_cond.wait_while { buf.empty? }
item = buf.shift
puts "got #{item.inspect}"
end
end
我让程序运行。 大约 5 分钟后，它抛出“分段错误”。 与僵局有关吗？
/杰克
I followed the example from http://www.ruby-doc.org/stdlib/libdoc/monitor/rdoc/index.html and modified the code a bit:
require 'monitor.rb'
buf = []
buf.extend(MonitorMixin)
empty_cond = buf.new_cond
producer = Thread.start do
# producer
line = "produce at #{Time.now}"
#while line
buf.synchronize do
puts "==> #{line}"
buf.push(line)
empty_cond.signal
end
sleep(2)
#line = "produce at #{Time.now}"
#end
end
loop do
buf.synchronize do
empty_cond.wait_while { buf.empty? }
item = buf.shift
puts "got #{item.inspect}"
end
end
I let the program run. Around 5 min later, it throws a "Segmentation fault". Something related to a deadlock?
/Jack
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正如您的代码所示（在生产者循环中注释掉 while 语句），生产者线程只需运行循环一次并退出。 消费者从 buf 中读取生成的一行，然后陷入僵局，等待更多永远不会到达的行。
Ruby 的线程调度程序具有内置的死锁检测功能，因此当它发现“消费者”循环出现死锁时，它将终止程序。
要亲自查看死锁，请将生产者转换为全局变量
$ Producer 并使用$consumer = Thread.start do ... end 包装循环语句。 将代码加载到 irb 并评估 $ Producer 应该会导致 => #< 主题：0x000000010afb58 死了> （以及睡眠线程中的 $consumer）取出与生产者 while 循环相关的注释，您将拥有一个工作（无限）循环，它以 2 秒的间隔生成当前时间。
As your code stands (with the commented out while-statement in producer-loop) the producer thread simply runs through the loop once and exits. The consumer reads the one produced line from buf and then is left in a deadlock waiting for more lines that will never arrive.
Ruby's Thread scheduler has inbuilt deadlock-detection, so it will terminate the program when it sees that the 'consumer'-loop has deadlocked.
To see the deadlock for yourself, turn the producer into a global variable
$producerand wrap the loop-statement with$consumer = Thread.start do ... end. Loading the code into irb and evaluating $producer should result in => #< Thread:0x000000010afb58 dead > (and $consumer in a sleeping thread)Take out the comments relating to producer's while-loop and you'll have a working (infinite) loop that produces the current time at 2 second intervals.