某种 Ruby“中断”

发布于 2024-09-27 17:04:29 字数 468 浏览 2 评论 0原文

这就是我正在做的——我有一个 ruby 脚本，每分钟打印出信息。我还为陷阱设置了一个过程，以便当用户按下 ctrl-c 时，进程就会中止。代码看起来像这样：

switch = true

Signal.trap("SIGINT") do
    switch = false
end

lastTime = Time.now

while switch do
    if Time.now.min > lastTime.min then
        puts "A minute has gone by!"
    end
end

现在代码本身是有效的并且运行良好，但是它做了很多无用的工作，尽可能频繁地检查 switch 的值。它会尽可能多地使用处理器（至少 100% 地使用一个核心），因此非常浪费。我怎样才能做类似的事情，其中事件经常更新，而不浪费大量的周期？

感谢所有帮助并提前致谢！

原文

So here's what I'm doing -- I have a ruby script that prints out information every minute. I've also set up a proc for a trap so that when the user hits ctrl-c, the process aborts. The code looks something like this:

switch = true

Signal.trap("SIGINT") do
    switch = false
end

lastTime = Time.now

while switch do
    if Time.now.min > lastTime.min then
        puts "A minute has gone by!"
    end
end

Now the code itself is valid and runs well, but it does a lot of useless work checking the value of switch as often as it can. It uses up as much of the processor as it can get (at least, 100% of one core), so it's pretty wasteful. How can I do something similar to this, where an event is updated every so often, without wasting tons of cycles?

All help is appreciated and thanks in advance!

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

最舍不得你 2024-10-04 17:04:29

您有几种解决方案。例如，如果您期望有很多信号并希望将每个信号作为一个事件进行处理，则可以使用 Thread::Queue。如果您真的只是等待 ^C 发生，而没有与其他线程进行复杂的交互，我认为使用 Thread#wakeup 可能很简单：

c = Thread.current

Signal.trap("SIGINT") do
  c.wakeup
end

while true
  sleep
  puts "wake"
end

You have several solutions. One is to use a Thread::Queue if you expect many signals and want to process each of them as an event, for example. If you are really just waiting for ^C to happen with no complex interactions with other threads, I think it may be simple to use Thread#wakeup:

c = Thread.current

Signal.trap("SIGINT") do
  c.wakeup
end

while true
  sleep
  puts "wake"
end

回复收藏 0 原文

对你再特殊 2024-10-04 17:04:29

如果您只是捕获 ctrl-c 中断并且不介意在按下按键和中断之间短暂等待...

switch = true

Signal.trap("SIGINT") do
    switch = false
end

lastTime = Time.now

while switch do
    sleep 1
    if Time.now.min > lastTime.min then
        puts "A minute has gone by!"
    end
end

“睡眠”功能使用系统计时器，因此在等待时不会耗尽 CPU。如果您想要更精细的计时分辨率，只需将 sleep 1 替换为 sleep 0.5 或更小，以减少检查之间的时间，

If you are just trapping ctrl-c interrupts and don't mind a short wait between pressing the keys and it breaking out then...

switch = true

Signal.trap("SIGINT") do
    switch = false
end

lastTime = Time.now

while switch do
    sleep 1
    if Time.now.min > lastTime.min then
        puts "A minute has gone by!"
    end
end

The 'sleep' function uses the system timers, so doesn't use up the CPU while waiting. If you want finer resolution timing just replace sleep 1 with sleep 0.5 or even smaller to reduce the time between checks,

回复收藏 0 原文

~没有更多了~