Ruby循环跳过元素

puts pids
pids.each do |pid|
    puts "Running on pid #{pid}"
    begin
        Process::kill(0,pid)
        puts "Pid #{pid} still alive"
    rescue Errno::ESRCH
        puts "Pid #{pid} now dead!!!!"
        pids.delete(pid)
        running_jobs -= 1
        puts "Remaining jobs: #{running_jobs}"
    end
end

输出这个：

25555
25579
25616
Running on pid 25555
Pid 25555 now dead!!!!
Remaining jobs: 2
Running on pid 25616
Pid 25616 now dead!!!!
Remaining jobs: 1

如您所见,循环永远不会在中间元素上执行.谁能告诉我为什么会这样？我需要真正循环每个项目并相应地处理它.