Thank you, I got it fixed.
At least the license of the Boehm GC allows blatent copy/pasting into
LGPLed sources ;-) .
If it works, expect a patch by the end of the week.
Maciej Stachowiak wrote:
On Jun 11, 2005, at 3:16 PM, Justin Haygood wrote:
the Win32 API simply does not allow getting the base stack address of
a thread, because:
1. not stable.. Windows *WILL* and *DOES* move that base address at will.
This part seems unlikely - I could imagine moving the physical address
of the stack, but what would be the point of moving the virtual
address? Further, this would break any code that kept a pointer to
anything on the stack.
But as Darin pointed out, it doesn't matter, because you only need to
get it at one particular point in time, it does not need to be stable
for all time.
2. Its exclusively chosen and managed by Windows itself.. no ands,
buts, or ors about it.
It's ok that Windows chooses it - it's chosen by the OS on pretty much
all platforms. We don't need to change the stack base, just to get it.
What would be an alternative way to implement a conservative GC that
I can use?
My suggestion for how to research this would be to look at the code
for the Boehm garbage collector. This is a portable conservative GC
implementation for C++, so they must have some way of getting the
range of the stack on windows. I'm not sure if the Boehm GC is
threadsafe, but as I pointed out it should be sufficient to just get
the stack base for the current thread or for the main thread, and to
disable marking of other threads.
http://www.hpl.hp.com/personal/Hans_Boehm/gc/
I took a quick peek in the source and it does appear to have a way to
get the stack base on win32.
Regards,
Maciej
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