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Subject:	RE: [BUG] cygwin-1.3.3-2 -- making auto-import dlls
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Date:	Wed, 19 Sep 2001 12:47:32 +1000
Message-ID:	<EA18B9FA0FE4194AA2B4CDB91F73C0EF08F199@itdomain002.itdomain.net.au>
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Thread-Topic:	[BUG] cygwin-1.3.3-2 -- making auto-import dlls
Thread-Index:	AcFAtQxk9WMLnPOxRj6Tg6WhIxSmKAAABy4A
From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	"Charles Wilson" <cwilson AT ece DOT gatech DOT edu>
Cc:	<cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id WAA10647

> -----Original Message-----
> From: Charles Wilson [mailto:cwilson AT ece DOT gatech DOT edu]
> > Solution: don't use auto-image-base. The overhead from relocation is
> > quite low, why not let windows just do its thing.
> 
> 
> Okay, suppose I have 5 dll's that are all based at the default, 
> 0x10000000. I start an exe that depends on those 5,  so at 
> startup time 
> they all get relocated to (random) address in my exe's address space. 
> Then cygwin1.dll is loaded. But the random addresses chosen for the 
> relocation for the first 5 dlls MAY or may NOT conflict with 
> cygwin1.dll's *fixed* location.
> 
> Boom (sometimes).
> 
> How is this better than the current "boom (sometimes)" 
> behavior?  What 
> am I missing?

AFAIK Relocated .dll's will never push a .dll with a different base
address out of the way. I.E. For that set of .dll's

the program will get it's address 0x10000000, cygwin1.dll get's its base
address, and the 5 .dll's get 5 other random address's.

How is it better? With a .dll that conflicts with cygwin1.dll, it's boom
(everytime) :].

Rob

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