Feature #3809

allow multiple set_trace_func() calls

Added by sunaku (Suraj Kurapati) over 8 years ago. Updated about 1 year ago.

Target version:



The current set_trace_func() method in Ruby 1.8 and 1.9 cannot be safely
called multiple times because each call overwrites the current trace_func.

Please consider adding a mechanism, such as the multitrace library1, to
allow users to attach multiple tracing functions simultaneously to Ruby.

An alternative to the multitrace library1 is to add some new methods:

  • attach_trace_func(proc) #=> proc
  • detach_trace_func(proc) #=> proc

When you call attach_trace_func(), it will register your tracing
function and return it. You can pass the same tracing function
later to detach_trace_func() to unregister it.

Here is a convoluted example:

detach_trace_func(attach_trace_func(proc {}))

Here is a more realistic example:

foo = proc {}
bar = proc {}
attach_trace_func foo
# ...
attach_trace_func bar
# ...
detach_trace_func foo
detach_trace_func bar

Thanks for your consideration.



#1 Updated by shyouhei (Shyouhei Urabe) about 8 years ago

  • Status changed from Open to Assigned



#2 [ruby-core:49144] Updated by mame (Yusuke Endoh) about 6 years ago

  • Description updated (diff)
  • Target version set to 2.6

#3 [ruby-core:49164] Updated by trans (Thomas Sawyer) about 6 years ago

Isn't this taken care of by the new TracePoint API?

#4 [ruby-core:83950] Updated by ko1 (Koichi Sasada) about 1 year ago

Please use TracePoint API.

#5 Updated by ko1 (Koichi Sasada) about 1 year ago

  • Status changed from Assigned to Closed

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