ruby - Why the exit function doesn't actually terminate the program -

why second thread doesn't terminate program , application still waits input first thread?

curses.init_screen  first = thread.new   loop {     curses.getch   } end  second = thread.new   curses.close_screen   exit end  second.join first.join 

os -- windows 8.

ruby 2.0.0p481 (2014-05-08) [x64-mingw32]

thanks in advance.

i think exit in scope running thread#exit instead of kernel#exit (as expecting). i'm using ruby 2.1.2, however, perhaps behavior bit different.

you can see running code:

2.1.0 :007 > thread.new 2.1.0 :008 >   puts self.inspect 2.1.0 :009?> end      main => #<thread:0x0000010142b8f8 sleep> 

as opposed to, if run puts self.inspect on own (not inside thread):

2.1.0 :011 > puts self.inspect main  => nil 

you should killed process if, instead, explicitly call kernel#exit

2.1.0 :001 > thread.new 2.1.0 :002 >   kernel::exit 2.1.0 :003?> end 

...which, in irb, close interactive session (kill process).

a simple example

if put in file:

# test.rb  first = thread.new   while 4 != 5     puts gets   end end  second = thread.new   kernel::exit end  second.join first.join 

...and command line:

$ ruby test.rb 

...the program close, not giving me time provide input first thread's gets method call.

whereas, if replace kernel::exit call thread::exit, program never exit, continually prompt me input.

possibly difference between 2.0.0p481 opposed 2.1.2 [x86_64]?