I have a wrapper for dbgeng.dll https://github.com/bnagy/rbuggery. At the moment I am trying to support both the 32 and 64 bit versions of the Debugging Tools For Windows, because debugging 32-bit apps with the x64 tools involves a lot of annoyances with WOW64. My plan is to switch by using the 32 or 64 bit JRE (jruby itself is only 32 bit, but you can't load 32-bit dbgeng.dll into the 64-bit JRE, naturally).

Under 64 bit java.exe everything works as expected. When I use 32-bit JRE there is no extra java.exe spawned and FFI calls to my wrapper objects fail over both DRb and Jimson. I'm presuming it's some threading thing, but I don't know.

Expected

DRb / FFI programs should work under either native or WOW64 (32 bit) JRE

Observed

x64 JRE works, x86 does not.

Environment

Microsoft Windows 7 Enterprise
6.1.7601 Service Pack 1 Build 7601

jruby 9.0.0.0 (2.2.2) 2015-07-21 e10ec96 Java HotSpot(TM) Client VM 25.51-b03
on 1.8.0_51-b16 +jit

Repro

1. Download and install https://github.com/bnagy/rbuggery (gem build rbuggery.gemspec; gem install rbuggery-1.1.1.gem)
2. Run examples/drb_example.rb under x64 (works)
3. Switch to x86 by changing JAVA_HOME and try (hangs)