Don't wait for Exception in threads

ruby-talk
1

I have two threads running in parallell, like this:

···

####################

t1=Thread.new{
  50.times{
    p "thread one"
    sleep 0.1
  }
}

t2=Thread.new{
  p "thread two"
  raise "error in thread two"
}

t1.join
t2.join

#################
The output is:
"thread one"
"thread two"
"thread one"
... 48 times more "thread one"
"thread one"
testscript.rb:15: error in thread two (RuntimeError)
  from testscript.rb:19:in `join'
  from testscript.rb:19

The program waits for the first thread to complete before telling me
that the second one raised an exception.
I don't want to wait until the first thread finishes to see the
exception, I want to see it right away.
How can I do that?

Regards
Emil
--
Posted via http://www.ruby-forum.com/.

2

Add this line early in your program:

   Thread.abort_on_exception = true

Hope that helps.

James Edward Gray II

···

On May 4, 2008, at 1:48 PM, Emil Sandin wrote:

I have two threads running in parallell, like this:

####################

t1=Thread.new{
50.times{
   p "thread one"
   sleep 0.1
}
}

t2=Thread.new{
p "thread two"
raise "error in thread two"
}

t1.join
t2.join

#################
The output is:
"thread one"
"thread two"
"thread one"
... 48 times more "thread one"
"thread one"
testscript.rb:15: error in thread two (RuntimeError)
from testscript.rb:19:in `join'
from testscript.rb:19

The program waits for the first thread to complete before telling me
that the second one raised an exception.
I don't want to wait until the first thread finishes to see the
exception, I want to see it right away.
How can I do that?

3

Hi Emil,

Emil Sandin schrieb:

I have two threads running in parallell, like this:

####################

t1=Thread.new{
  50.times{
    p "thread one"
    sleep 0.1
  }
}

t2=Thread.new{
  p "thread two"
  raise "error in thread two"
}

t1.join
t2.join

#################
The output is:
"thread one"
"thread two"
"thread one"
... 48 times more "thread one"
"thread one"
testscript.rb:15: error in thread two (RuntimeError)
  from testscript.rb:19:in `join'
  from testscript.rb:19

The program waits for the first thread to complete before telling me
that the second one raised an exception.
I don't want to wait until the first thread finishes to see the
exception, I want to see it right away.
How can I do that?

You can do something like:

Thread.abort_on_exception = true
t =
t << Thread.new {
   50.times{
     p "thread one"
     sleep 0.1
   }
}
t << Thread.new {
   p "thread two"
   raise "error in thread two"
}
t.each {|t| t.join }

I dont have tested the example, but this way you should see the Exception in the Moment it occurs

Andi

4

James Gray wrote:

···

On May 4, 2008, at 1:48 PM, Emil Sandin wrote:

"thread one"
I don't want to wait until the first thread finishes to see the
exception, I want to see it right away.
How can I do that?

Add this line early in your program:

   Thread.abort_on_exception = true

Hope that helps.

James Edward Gray II

Thank you, that's exactly what I am looking for.

--
Posted via http://www.ruby-forum.com/\.