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Bug #16889

Updated by Eregon (Benoit Daloze) 3 months ago

```ruby 
 threads = [] 
 inspects = [] 
 trace = TracePoint.new(:line) do |tp| 
   threads << Thread.current 
   inspects << tp.inspect 
 end 

 done = false 
 thread = Thread.new do 
   Thread.pass until done 
 end 

 trace.enable do 
   line_event = true 
   done = true 
   sleep 1 
 end 
 thread.join 

 # Expected only within enable block (lines 14-16) 
 puts inspects 

 # Expected just 1 
 p threads.uniq 
 ``` 

 Results in: 
 ``` 
 $ ruby tpbug.rb 
 ruby tpbug.rb 
 #<TracePoint:line@tpbug.rb:14> 
 #<TracePoint:line@tpbug.rb:15> 
 #<TracePoint:line@tpbug.rb:16> 
 #<TracePoint:line@tpbug.rb:10> 
 [#<Thread:0x00005571134e3340 run>, #<Thread:0x00005571138ac828@tpbug.rb:9 dead>] 
 ``` 

 But I expected: 
 ``` 
 #<TracePoint:line@tpbug.rb:14> 
 #<TracePoint:line@tpbug.rb:15> 
 #<TracePoint:line@tpbug.rb:16> 
 [#<Thread:0x00005571134e3340 run>] 
 ``` 

 Because the RDoc says: 
 ``` 
 If a block is given, the trace will only be enabled within the scope of 
 the block. 
 ``` 

 For background I'm trying to improve the TracePoint specs in ruby/spec, but they are proving quite unreliable due to this. 

 @ko1 Thoughts?

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