某种Ruby“中断” [英] Some sort of Ruby "Interrupt"

问题描述

所以这里是我正在做的 - 我有一个ruby脚本，每分钟打印出一些信息。我还设置了一个陷阱的进程，以便当用户点击ctrl-c时，进程中止。代码看起来像这样：

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

现在代码本身是有效的，运行良好，但是许多无用的工作经常检查 switch 的价值。它可以使用尽可能多的处理器（至少是一个核心的100％），所以这很浪费。如何进行类似的事情，哪些事件经常更新，而不会浪费大量的周期？

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?

所有的帮助是感谢，并提前感谢！ p>

All help is appreciated and thanks in advance!

推荐答案

如果你只是陷入ctrl-c中断，不要介意按键之间的短暂等待，那么它就会突破。 ..

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

睡眠功能使用系统计时器，所以等待时不用CPU。如果您想要更精细的分辨率时间，只需将 sleep 1 替换为 sleep 0.5 或更小以减少支票之间的时间，

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,

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