provide equivalent of MRI's rb_exec_end_proc
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Key: JRUBY-6020
URL: https://jira.codehaus.org/browse/JRUBY-6020
Project: JRuby
Issue Type: Bug
Reporter: John Firebaugh
Assignee: Thomas E Enebo
MRI's
[rb_exec_end_proc](https://github.com/ruby/ruby/blob/1df42597d15416357a20bd68700ce1a2d245e8bb/eval_jump.c#L96)
executes all the at_exit blocks.
The ruby-debug-base C extension [calls this
method](https://github.com/ruby-debug/ruby-debug/blob/8ff6f477b17ded583d72c773e91b9c4803b9a0ea/ext/ruby_debug.c#L1418-L1420),
allowing at_exit blocks to be properly debugged prior to the debugger shutting
down. This is essential for debugging tests, as many test frameworks use
at_exit to auto-run all registered tests.
JRuby's ruby-debug-base currently [calls
Ruby.tearDown()](https://github.com/jruby/jruby-debug/blob/master/src/org/jruby/debug/Debugger.java#L105)
when stopping the debugger via Debugger.stop. Ruby.tearDown does run at_exit
blocks, but also tears down the entire runtime. I'm amazed that this even sort
of works considering that Debugger.start/Debugger.stop can be called multiple
times during a program run, and there's always more Ruby code executing
following Debugger.stop. Tearing down the runtime while things are still in
flight definitely has some bad side effects (test failures in the ruby-debug
test suite, random debugger hangs due to corruption of internal structures).
I'd like to have a Ruby.executeAtExitBlock() so JRuby's ruby-debug-base can
mimic the behavior of the C extension.
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