如何阻止
Ruby中的某些信号？ (即,sigprocmask,如下所述：
http://www.chemie.fu-berlin.de/chemnet/use/info/libc/libc_21.html#SEC371)
这是我的示例代码
pid = fork do
trap('INT') do
puts "Graceful shutdown..."
puts "goodbye"
exit 0
end
loop do
this_could_be_interrupted
something_that_must_not_be_interrupted
this_could_be_interrupted_too
end
end
sleep 5
Process.kill('INT',pid)
我可以在ruby块或某些东西中包装something_that_must_not_be_interrupted以确保在该方法运行时SIGINT不会被处理吗？
我想,如果我能做这样的事情,理想的是：
Process.block_signal('INT') do
something_that_must_not_be_interrupted
end
更新：我正在做这样的事情：
trap('INT') do
@interrupted = true
end
loop do
exit 0 if @interrupted
something_that_must_not_be_interrupted
end
解决方法
我想你正在寻找
non-block form of
trap：
Signal.trap( signal,command ) → obj
[…]
If the command is the string"IGNORE"or"SIG_IGN",the signal will be ignored. If the command is"DEFAULT"or"SIG_DFL",the Ruby‘s default handler will be invoked.
所以你应该可以这样说：
trap('INT','IGNORE')
something_that_must_not_be_interrupted
trap('INT','DEFAULT')
更新：从评论中,您只需要暂时忽略该信号.使用您已经拥有的最简单的方法是添加一个标志,您的信号处理程序可以看到,然后记住信号,当它进来,我们目前忽略信号,当我们不再忽视的东西了只需将信号队列发送给自己即可.如果把这个逻辑包装在一个类中,你会有一些相当友好的东西：
#
# Threading and race condition issues are left as an exercise,# this is just meant as an illustration. Handling multiple signals
# at once is also left as an exercise.
#
class SignalHandler
def initialize(signal)
@interuptable = true
@enqueued = [ ]
trap(signal) do
if(@interuptable)
puts "Graceful shutdown..."
puts "goodbye"
exit 0
else
@enqueued.push(signal)
end
end
end
# If this is called with a block then the block will be run with
# the signal temporarily ignored. Without the block,we'll just set
# the flag and the caller can call `allow_interuptions` themselves.
def dont_interupt
@interuptable = false
@enqueued = [ ]
if(block_given?)
yield
allow_interuptions
end
end
def allow_interuptions
@interuptable = true
# Send the temporarily ignored signals to ourself
# see http://www.ruby-doc.org/core/classes/Process.html#M001286
@enqueued.each { |signal| Process.kill(signal,0) }
end
end
真正的功能代码是解释技术的最简单的方法(我必须写它来确保技术可以工作),所以你去.感谢Ruby的信号处理审查:)那么你可以这样做：
sigint = SignalHandler.new('INT')
loop do
this_could_be_interrupted
sigint.dont_interupt { something_that_must_not_be_interrupted }
this_could_be_interrupted_too
end