Feature #3809: allow multiple set_trace_func() calls

• Status: Closed
• Assignee: matz (Yukihiro Matsumoto)
• Target version: 2.6

[sunaku (Suraj Kurapati)]

=begin
Hello,

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.

=end

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned

=begin

=end

[mame (Yusuke Endoh)]

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

[trans (Thomas Sawyer)]

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

[ko1 (Koichi Sasada)]

Please use TracePoint API.

[ko1 (Koichi Sasada)]

• Status changed from Assigned to Closed