Re: Multiple cygwin.dll's

[Christopher Faylor <cgf at redhat dot com>]

On Thu, Oct 11, 2001 at 05:56:08PM -0400, Christopher Faylor wrote:
>On Thu, Oct 11, 2001 at 10:11:26AM -0400, Harold Hunt wrote:
>>Rasjid,
>>
>>Yes, it will still cause a problem.
>>
>>The problem is not caused by the location from which the DLL was loaded.
>>Different versions of cygwin1.dll conflict with each other because all
>>loaded copies of cygwin1.dll must share a memory area to preserve state
>>information in a manner similar to an operating system kernel.  Different
>>versions of cygwin1.dll have different interpretations of the structure of
>>the shared memory region, thus loaded different versions of cygwin1.dll
>>results in the shared memory becoming corrupted, which generally crashes any
>>loaded cygwin1.dll and any programs depending on cygwin1.dll.
>
>This is all exactly right.
>
>There are actually issues beyond the shared memory region which make
>this a hard problem to fix.
>
>Part of the problem is that I don't think it should be fixed.  There
>should only ever be one cygwin1.dll on your system.  It should be the
>latest released version.  It should be in the /bin directory.
>
>That's the general rule.  Of course, there are no cygwin police who will
>kick down your down and pull you off to cygwin jail if you don't follow
                door

cgf