Access denied while trying to create a mutex.

[UJ]

Has anybody seen an 'Access denied' error when trying to create a mutex? If
so - what does that mean? I though Mutex's were not supposed to error out.

TIA - Jeff.

[Vadym Stetsyak]

Hello, UJ!

U> Has anybody seen an 'Access denied' error when trying to create a mutex?
U> If so - what does that mean? I though Mutex's were not supposed to error
U> out.

AFAIK to create mutex, your code has to have SecurityPermissionFlag.UnmanagedCode flag.

Also if you're "creating" mutex that already exists you can have no access to it, if its creator had set appropriate ACLs

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com

[UJ]

The thing that is weird is it happens only occasionally. If we restart the
program, it will work.

"Vadym Stetsyak" <va*****@ukr.net> wrote in message
news:eV**************@TK2MSFTNGP02.phx.gbl...

Hello, UJ!

U> Has anybody seen an 'Access denied' error when trying to create a
mutex?
U> If so - what does that mean? I though Mutex's were not supposed to
error
U> out.

AFAIK to create mutex, your code has to have
SecurityPermissionFlag.UnmanagedCode flag.

Also if you're "creating" mutex that already exists you can have no access
to it, if its creator had set appropriate ACLs

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com

[Vadym Stetsyak]

Hello, UJ!

Interesting, give us more context for the problem: what is creating mutex, how it is used, are there any security related operations in the application etc.?

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com

[Michael Nemtsev]

I recomend look at these threads
http://groups.google.com/group/micro...a3b2ea6976b16d

http://groups.google.com/group/micro...1e34df50df665f

BTW, Did u create windows service and use mutex there?

The thing that is weird is it happens only occasionally. If we restart the
program, it will work.

--
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[UJ]

It's in stand alone programs. I've got multiple programs trying to write to
a log file so I mutex around the writes. That seems to be where the problem
lies.

I haven't done anything with security so it should be OK.

"Michael Nemtsev" <ne*****@msn.com> wrote in message
news:97**********************************@microsof t.com...

I recomend look at these threads
http://groups.google.com/group/micro...a3b2ea6976b16d

http://groups.google.com/group/micro...1e34df50df665f

BTW, Did u create windows service and use mutex there?

The thing that is weird is it happens only occasionally. If we restart
the
program, it will work.

--
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do
not
cease to be insipid." (c) Friedrich Nietzsche

[Willy Denoyette [MVP]]

Make sure all you program run in the same logon session as the owner of the
mutex, that is, make sure no-one impersonates when accessing the mutex.

Willy.
"UJ" <fr**@nowhere.com> wrote in message
news:eu**************@TK2MSFTNGP03.phx.gbl...
| It's in stand alone programs. I've got multiple programs trying to write
to
| a log file so I mutex around the writes. That seems to be where the
problem
| lies.
|
| I haven't done anything with security so it should be OK.
|
| "Michael Nemtsev" <ne*****@msn.com> wrote in message
| news:97**********************************@microsof t.com...
| >I recomend look at these threads
| >
http://groups.google.com/group/micro...a3b2ea6976b16d
| >
| >
http://groups.google.com/group/micro...1e34df50df665f
| >
| > BTW, Did u create windows service and use mutex there?
| >
| >>> The thing that is weird is it happens only occasionally. If we restart
| >>> the
| >>> program, it will work.
| >
| > --
| > WBR,
| > Michael Nemtsev :: blog: http://spaces.msn.com/laflour
| >
| > "At times one remains faithful to a cause only because its opponents do
| > not
| > cease to be insipid." (c) Friedrich Nietzsche
| >
| >
|
|

[UJ]

I originally had all the programs in the startup group. I now have a program
that launches each of the programs in order. I'm doing nothing with security
so I have to assume that I'm the same user for each program.

"Willy Denoyette [MVP]" <wi*************@telenet.be> wrote in message
news:ea**************@TK2MSFTNGP03.phx.gbl...

Make sure all you program run in the same logon session as the owner of
the
mutex, that is, make sure no-one impersonates when accessing the mutex.

Willy.
"UJ" <fr**@nowhere.com> wrote in message
news:eu**************@TK2MSFTNGP03.phx.gbl...
| It's in stand alone programs. I've got multiple programs trying to write
to
| a log file so I mutex around the writes. That seems to be where the
problem
| lies.
|
| I haven't done anything with security so it should be OK.
|
| "Michael Nemtsev" <ne*****@msn.com> wrote in message
| news:97**********************************@microsof t.com...
| >I recomend look at these threads
| >
http://groups.google.com/group/micro...a3b2ea6976b16d
| >
| >
http://groups.google.com/group/micro...1e34df50df665f
| >
| > BTW, Did u create windows service and use mutex there?
| >
| >>> The thing that is weird is it happens only occasionally. If we
restart
| >>> the
| >>> program, it will work.
| >
| > --
| > WBR,
| > Michael Nemtsev :: blog: http://spaces.msn.com/laflour
| >
| > "At times one remains faithful to a cause only because its opponents
do
| > not
| > cease to be insipid." (c) Friedrich Nietzsche
| >
| >
|
|