[MacRuby-devel] Return from thread context

[Perry Smith]

The spec says that a 'return' from a thread should raise a  
LocalJumpError.

Looking at the code for RETURN_NODE in compiler.cpp, the question of  
"Is this a thread" is never asked.  And, I guess this exception is  
only for the top level block of the thread since a function called  
from the block could do a return.

I looked briefly at the Thread create process and I didn't see  
anything that flagged the block passed as the top level block for the  
thread.

The testcase causes a segmentation fault.  I looked at the signal  
handler too and it appears as if it is "lets do this for now and  
address it later" code.  The SEGV fault handler simply sets a flag and  
returns.  The return will put us back where we were just at so we  
immediately seg fault again and then we do an exit -- with no core file.

I don't see the value of catching SEGV in the first place unless the  
underlying Ruby code has asked us to do that.  I think that would  
generally apply to all signals.

Perry