1.5.15: multiple simultaneous processes can fail to start

[Christopher Faylor]

On Thu, Apr 21, 2005 at 01:50:44PM -0700, Usman Muzaffar wrote:
>Hello. We seem to be having difficulty when two Cygwin processes are
>started simultaneously (or in close succession) on multiprocessor
>Windows 2003 systems. The problem manifests as this error:
>
>    c:\cygwin\bin\which.exe (3824): *** system shared memory version
>mismatch
>    detected - 0x0/0x75BE007F.
>    This problem is probably due to using incompatible versions of the
>    cygwin DLL.  Search for cygwin1.dll using the Windows
>    Start->Find/Search facility and delete all but the most recent
>    version.  The most recent version *should* reside in
>    x:\cygwin\bin, where 'x' is the drive on which you have installed
>    the cygwin distribution.  Rebooting is also suggested if you are
>    unable to find another cygwin DLL.

Looking at the code I can't see any way that this error could ever occur
but, then, the code that produced this error was actually wrong.

I just checked in a minor rewrite around this error message.  I don't know
if it will fix this problem or not.  I couldn't duplicate your problem here,
FWIW.

This will be in the next cygwin snapshot: http://cygwin.com/snapshots/ .

cgf

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