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Date: Tue, 06 May 2003 13:47:26 -0400
From: Jason Tishler <jason AT tishler DOT net>
Subject: cygipc (and PostgreSQL) XP problem resolved!
To: Cygwin <cygwin AT cygwin DOT com>
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Chuck,

Thanks to help from Frank Seesink, I was able to finally figure out why
cygipc and in turn PostgreSQL failed to work properly under XP in
certain situations.  See the attached for some of the details.

In summary, invoking the XP Fast User Switching feature causes XP to
start using multiple kernel object namespaces instead of a single global
one.  This in turn causes cygipc clients to fail to find a global
semaphore (i.e., \BaseNamedObjects\MultiSemSem_) created by ipc-daemon
and abort.

Are you willing to accept a cygipc patch to correct this problem?

Thanks,
Jason

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Date: Tue, 06 May 2003 09:32:17 -0400
From: Jason Tishler <jason AT tishler DOT net>
Subject: Re: [CYGWIN] initdb failure with PostgreSQL 7.3.2 / Cygwin 1.3.22-1 /
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Frank,

On Mon, May 05, 2003 at 03:36:56PM -0400, Frank Seesink wrote:
> Jason Tishler wrote:
> >[snip]
> >I did some more Googling.  Does the following apply to your setup?
> >
> >    http://support.microsoft.com/default.aspx?scid=kb;en-us;264651
> 
> [snip]
> But I believe the very act of using the Fast User Switching (where you
> 'Switch Users' without logging out) is what is causing this.

I have confirmed the above hypothesis with the attached test program,
cit2.c.  If cit2.exe is invoked as follows:

    $ cit2
    192 = OpenSemaphore(MultiSemSem_) succeeded

then it will work only under Terminal Services session 0 (i.e., the
first user to log on).

However, if cit2.exe is invoked as follows:

    $ cit2 1
    192 = OpenSemaphore(Global\MultiSemSem_) succeeded

then it will work under any Terminal Services session (i.e, even after a
Fast User Switch).

See the following MSDN article:

    http://msdn.microsoft.com/library/default.asp?url=/library/en-us/termserv/termserv/kernel_object_namespaces.asp

which explains the multiple Terminal Services namespaces and how to
access them.

I will work with the cygipc maintainer to enhance cygipc to properly
handle Fast User Switching.

Your help in debugging this problem is greatly appreciated.

Thanks,
Jason

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#include <windows.h>
#include <stdio.h>

#define CYGWIN_IPCNT_SEMSEM "MultiSemSem_"
#define GLOBAL_CYGWIN_IPCNT_SEMSEM "Global\\MultiSemSem_"

int
main(int argc, char* argv[])
{
	HANDLE handle = 0;
	char* semaphore = CYGWIN_IPCNT_SEMSEM;

	if (argc > 1 && argv[1][0] == '1')
		semaphore = GLOBAL_CYGWIN_IPCNT_SEMSEM;

	handle = OpenSemaphore(SEMAPHORE_ALL_ACCESS, FALSE, semaphore);
	if (handle)
	{
		printf("%ld = OpenSemaphore(%s) succeeded\n", handle, semaphore);
		CloseHandle(handle);
	}
	else
	{
		printf("OpenSemaphore(%s) failed with last error = %ld\n", semaphore,
			GetLastError());
	}

	return 0;
}

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