Re: [Jikesrvm-researchers] VM_Uninterruptable

[David P G. <gr...@us...>]

Unfortunately we do not have a good method for doing this.

The guard region is fairly big, so it usually is not a problem.  You can
dump the machine code for a particular set of methods and see how big their
stackframes are.  Avoid recursion in uninterruptible methods.

If you are seeing unexplained memory corruption, you could try making the
guard region bigger and see if it goes away.  Another possibility is to
fill the guard region of the stack frame with an unusual bit pattern (eg
0xdeadbeef) and check to make sure that the end of the guard region still
has this pattern when the thread terminates.

--dave




|---------+-------------------------------------------------------->
|         |           Hezi Azatchi <he...@cs...>       |
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|         |           03/16/2002 04:06 PM                          |
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  |       Subject:  [Jikesrvm-researchers] VM_Uninterruptable                                |
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Hi,

In the user-guide is says: "an uninterruptable method will never cause a
stack overflow trap ... Furthermore, any uninterruptable method should not
need more stack space than specified in VM_StackFrameLayourConstants for
the stack "guard" area". My question: How can I verify this? (i.e. that
a VM_Uninterruptable method won't exceed the stack space available for
it).

Thanks,
--Hezi.

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